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1

Performance Evaluation of Horizontal Flow Constructed Wetland for Removal of Pharmaceuticals from Synthetic Wastewater

Mumtaj Zeba Ali, Khan Abdul Rahman, Alsubih Majed, Khan Saimah

Rocznik Ochrona Środowiska

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2024

|

Tom 26

322--334

EN

The removal efficiency of pharmaceutical compounds in wastewater treatment can be significantly influenced by seasonal variations and the presence of vegetation. This study evaluates the removal efficiencies of five pharmaceutical compounds – Cefadroxil (CFL), Ciprofloxacin (CIP), Cefpodoxime (CFD), Atenolol (ATN) and Avil-25 (AVL) – in non-planted (CW2) and planted (CW1) constructed wetlands across various parameters including Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Alkalinity, Nitrate, and Phosphate during winter and summer seasons. Results indicate that CW1 consistently outperforms CW2 in all parameters and seasons. For example, CW1 achieved 54.28% BOD removal for CFL in winter compared to CW2's 39.67%, with summer values reaching 79.6% and 69.7%, respectively. The superior performance of CW1 was also observed for COD and other parameters, with phosphate removal reaching 94% in summer. The results of HPLC analysis indicated that CW1 showed better removal efficiencies of Cefadroxil (56.94%), Ciprofloxacin (90%), and Avil-25 (99.7%) than CW2. Even though Cefpodoxime showed low removal efficiency in both systems, CW1 still performed slightly better (13.99% vs. 0.7%). Atenolol removal was particularly notable in CW1 (93.79%), significantly outperforming CW2. Hazard quotient assessments revealed lower risks associated with pharmaceutical residues in CW1. For example, Ciprofloxacin's hazard quotient was reduced from 16% in CW2 to 10% in CW1, underscoring the effectiveness of vegetation in mitigating environmental risks. Atenolol showed a significant hazard quotient reduction from 2% in CW2 to less than 0.5% in CW1, while Avil-25's hazard quotient was negligible in CW1 compared to 4% in CW2. It was also concluded that vegetation positively influenced the treatment efficacy of constructed wetlands for pharmaceuticals with reduced eco-toxicity and the associated risks.

2

Performance of a Horizontal Subsurface Flow Constructed Wetland in Treating Aquaculture Wastewater

Amponsah Shadrack Kwadwo, Frimpong Felix, Danquah Eric Owusu, Amankwaa-Yeboah Patricia, Amengor Natson Eyram, Dzomeku Joel Bubune, Agyemang Samuel Mensah, Adu Joel Kwaku, Frimpong Theophilus, Azumah Divine Dogbeda

Journal of Ecological Engineering

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2024

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Vol. 25, nr 10

53--61

EN

The escalating demand for water and the increasing pollution of natural water bodies necessitate innovative solutions for wastewater treatment and reuse. This study investigated the potential of a horizontal subsurface flow (HSSF) constructed wetland to treat aquaculture wastewater for reuse. The system, planted with Taro (Colocasia esculenta) and sugarcane (Saccharum officinarum L.), received effluent from a recirculating aquaculture system (RAS) producing African Catfish (Clarias gariepinus). The study assessed the impact of varying hydraulic retention times (1–3 days) and flow rates (11–108 L/min) on water quality parameters, including dissolved oxygen, electrical conductivity, salinity, total dissolved solids, temperature, and pH. Results showed significant increase in dissolved oxygen (4.25–5.52 mg/L), while electrical conductivity (491–677 µS/cm), salinity (0.23–0.32 ppt), and total dissolved solids (237–332 mg/L) decreased considerably. Temperature (29.28–31.07°C) and pH (7.57–7.59) remained stable and within acceptable ranges for reuse in African Catfish production. However, retention time and flow rate did not significantly affect treatment efficiency within the tested parameters. Further research is recommended to explore the impact of longer retention times, wider flow rate ranges, different plant species and substrate types, and microbial community analysis to optimize the system’s performance and promote sustainable aquaculture practices.

3

Treatment Ability and Community Responses of Candung as an Appropriate Technology to Maintain Irrigation Water Quality

Sumantra I. Ketut, Widnyana I. Ketut, Wijaya I. Made Wahyu, Bouchama Khaled

Journal of Ecological Engineering

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2023

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Vol. 24, nr 6

348--365

EN

With the burgeoning population, the community activities, such as laundering, washing, or even bathing, have expanded along the irrigation canal. Consequently, some chemicals from those activities are released and pollute the water body. Besides, the discharge of wastewater into the irrigation system is also an issue of public health concern, because it creates an environment conducive to the reproduction of any pathogenic agent. Using candung as constructed wetlands (CW)-like to treat the irrigation water in rice paddies would be an interesting tool for removing pollutants from the irrigation water. Candung, as a locally used CW in Bali Island, has been applied in the rice field long time ago. The present study aimed to examine candung as a local attached CW or treating irrigation water and analyse the community awareness regarding the candung application. The result showed a positive effect of candung in maintaining the water quality parameters, such as TSS, BOD, COD, and nutrients with certain aquatic plants (Nelumbo nucifera, Nymphaea tetragona, and Pistia stratiotes). The knowledge, behaviour, and action of the local subak community were still limited, whereas they had positive perceptions and responses about candungthe potential of candung as an agrotourism attraction in the village as well.

4

Textile Wastewater Treated by Constructed Wetlands – A Critical Review

Hussein Amjad

Journal of Ecological Engineering

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2023

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Vol. 24, nr 5

256--275

EN

Textile industries are among the most environmentally unsustainable businesses, releasing large amounts of effluent that endangers ecosystem health. Constructed wetlands (CWs) are low-cost eco-technical treatments for industrial wastewater control. The CWs are self-contained remediation systems that do not require external energy and have basic mechanisms for pollutant removal, such as biological, chemical, and physical processes. For more than sixty years, constructed wetlands have been utilized to clean wastewater. Most applications have been developed to treat municipal or household wastewater, although CWs are now successfully used to treat a wide range of wastewater types. Constructed wetlands were also employed to treat textile industry effluents in the 1990s. The survey indicated that textile manufacturing wastewaters were treated using subsurface and surface-flow wetlands. Both horizontal and vertical flow systems have been designed within subsurface flow-created wetlands. In addition, many hybrid-built wetlands have recently been documented in the literature for textile industrial wastewater treatment. According to the survey, textile industrial wastewater is treated in constructed wetlands on all continents, and this research includes the data from 65 constructed wetlands in 21 nations worldwide. This paper examined the latest improvements and discoveries in CWs and the many types of CWs used for textile wastewater treatment. The paper also demonstrated state-of-the-art integrated technologies for improving the performance and sustainability of CWs, such as CW-MFC systems.

5

Recent Progress of Phytoremediation-Based Technologies for Industrial Wastewater Treatment

Yuliasni Rustiana, Kurniawan Setyo Budi, Marlena Bekti, Hidayat Mohamad Rusdi, Kadier Abudukeremu, Ma Peng Cheng, Imron Muhammad Fauzul

Journal of Ecological Engineering

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2023

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Vol. 24, nr 2

208--220

EN

Phytoremediation is considered of a cost effective and environmentally friendly technology and has been used successfully for the remediation of soils and water contaminated with various pollutants. Specifically for full scale application to treat industrial wastewater, phytoremediation is used as sole technology for different types of wetlands. However, phytoremediation of polluted water in wetland type reactor has been mostly studied as black box. The method to measure the performance is only based on pollutant removal efficiency and there is very limited information available about of the pollutant removal mechanisms and process dynamics in these systems. Thus, the aim of this chapter was to briefly review basic processes of phytoremediation, its mechanisms and parameters, and its interaction between rhizo-remediation and microbe-plant. In addition, this chapter also elaborated phytoremediation challenges and strategies for full-scale application, its techniques to remove both organic and inorganic contaminants by aquatic plants in water, and some examples of applications in industries.

6

Development of the Horizontal Flow Wetland Using Palm Waste Biochar for Greywater Reclamation

Aylan Rana A., Al-Abbawy Dunya A. H., Yaseen Dina A.

Journal of Ecological Engineering

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2023

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Vol. 24, nr 8

236--249

EN

Wetlands technology is one of the main sustainable and successful treatment processes. Similarly, biochar is an organic, effective, and low-cost adsorbent material used for the treatment of diverse wastewaters. The combination between wetland system and biochar, as a media, can greatly enhance the treatment efficiency. The aim of this study is to assess the performance of two horizontal flow constructed wetlands planted with Bacopa monnieri L. for the treatment of household greywater. The objectives were to investigate the raw and treated greywater characteristics, compare the removal efficiency of pollutants by using gravel bed, and biochar-gravel bed, monitor the growth and survival of the plants. Findings indicated that the simulated treatment systems were able to improve all the greywater characteristics. The wetland with biochar enhanced the removal efficiency of biological oxygen demand (BOD5), ammonia (NH3), and other parameters compared with the wetland with gravels alone.

7

Optimization of Acetaminophen and Methylparaben Removal within Subsurface Batch Constructed Wetland Systems

Mutar Zahraa Hasan, Mohammed Ahmed A., Al-Baldawi Israa Abdulwahab

Journal of Ecological Engineering

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2022

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Vol. 23, nr 1

228--239

EN

The response surface methodology accompanied by Central Composite Design (CCD) was employed in this study to optimize the Alternanthera spp-based phytoremediation process for the individual removal of acetaminophen and methylparaben. Two operational variables, including concentration (A) (20, 60,100 mg/L) and sampling time (B) (7, 14, 21, and 35 days) were involved in the study for removal efficiency (Y) as response. CCD had required a total of 18 experiments for each compound. Analysis of variance (ANOVA) was conducted to verify the adequacy of the proposed mathematical models and revealed good agreement with the experimental data. The observed R2 values (0.9732 and 0.9870), adjusted R2 (0.9620 and 0.9816) and predicted R2 (0.9383 and 0.9721) for AC and MP, respectively, indicated that the developed models were significant at the 95% probability level. Concentration factor was found to be insignificant in the mathematical models; in contrast, sampling time was found to be of a crucial role. The removal of AC and MP were 89.23% and 64.48% under optimum conditions of A = 100 mg/L and B = 35 days respectively. The validation test confirmed the predicted results obtained by Central Composite Design, as the removals achieved under optimum conditions were 91.04% and 59.17% for AC and MP, respectively, which were in good agreement with the results proposed by the theoretical design.

8

Modelling Assisted Phytoremediation of Landfill Leachate using Surface Flow Constructed Wetland Enhanced by Pistia stratiotes and Salvinia molesta

Ugya Adamu Yunusa, Meguellati Kamel

Journal of Ecological Engineering

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2022

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Vol. 23, nr 5

226--236

EN

The current study is aiming to expose the efficiency of surface flow constructed wetland (CW) assisted by Pistia stratiote and Salvinia molesta in the remediation of landfill leachates. A laboratory-scale surface flow constructed wetland was constructed to imitate the characteristic of a natural pond. Composite sample of leachates was collected and transported to the laboratory for further analysis and studies. The removal efficiency of phenol, pesticides, sulphate, chloride, colour, turbidity, total suspend solid (TSS), total dissolved solid (TDS), biological oxygen demand (BOD), chemical oxygen demand (COD), ammonia nitrate and heavy metals (Pb, Cr, Cu, Cd, Ni, Hg)). The removal of heavy metal ions in the CW was determined by using a phyto-system dynamic (phyto-SDA) model while the composite design (CCD) type of response surface methodology (RSM) was employed in this study for the optimization of pesticides and phenol removal from the landfill leachates by the constructed wetland (CW). The study also predicts that the deviation from the linearity between the heavy metals in the leachates and heavy metals in the sediment and in the plant tissues is influenced by the physicochemical status of the leachate and the mixed cultivation of Pistia stratiote and Salvinia molesta. The study reaffirms the role of sediments in the determination of the fate of heavy metals due to its crucial role in the bioavailability of heavy metals for uptake by P. stratiotes and S. molesta in a CW. The study also shows a positive effect of concentration and exposure time on the reduction efficiency of both pesticides and phenol. The result shows that exposure time and concentration of phenol and pesticides are useful in the optimization of the removal efficiency of pesticides and phenol.

9

Kinetics of Pollutants Removal in Wetlands Influenced by Retention Time and Number of Plants Using Cyperus alternifolius

Rahman Danar Arifka, Priambodo Eka Wahyudi, Caturputranto Trisnadi Widyaleksono, Wahyudianto Febri Eko

Journal of Ecological Engineering

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2022

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Vol. 23, nr 12

37--43

EN

Constructed wetland is considered an alternative for domestic wastewater treatment in cities. This study serves to evaluate the removal capacity and kinetics of TSS, COD, phosphate, and surfactant in domestic wastewater with several plants of Cyperus alternifolius, through the use of the constructed wetlands treatment. The overall objective of the study was to determine the ability of Cyperus alternifolius to remove water pollutants in domestic wastewater in several plants. The domestic wastewater was contacted in a batch system. The results indicated that CWs had a good performance on COD, phosphate, and surfactant with removal efficiencies of more than 80%, with a retention time of 8 days and 5 plants. However, the removal of suspended solids was found limited, as shown that the TSS removal efficiency was under 40%. The first-order equation of kinetics described the degradation of pollutants. The q1/2 values, which were defined as the average removal loading prior to the half of the pollutant concentration being removed and represented the removal capacity without limitation of pollutants concentration, were moderately increased with an addition to the number of plants.

10

Improving Wastewater Reclamation Using Constructed Wetlands by Artificial Plastic Biofilm Carriers

Zaboon Baneen Hussein, Al-Abbawy Dunya A. H., Yaseen Dina A.

Journal of Ecological Engineering

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2022

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Vol. 23, nr 11

241--253

EN

Increasing the demand for potable water, followed by the high quantity of discharged effluents linked with the water scarcity problems has necessitated giving more attention to improving wastewater treatment processes and operations. The constructed wetland has proven to be an excellent green sustainable technique for purification. This study aimed to examine the performance of four experimental free water surface constructed wetlands (FWSCWs) for the depuration of sewage effluents as a secondary treatment stage during winter season conditions. The objectives were to assess the raw and treated wastewater concentrations, evaluate the removal efficiency of chemical oxygen demand (COD), biological oxygen demand (BOD), nutrients, and total suspended solids (TSS) of each treatment line, and compare the impact of plastic rings (biofilm carriers) and Lemna minor L. with the presence of gravel bed on the treatment efficiency and bacterial growth, as well as assess the plant’s adaption and growth. The results showed that all treatment systems improved the water characteristics, and adding biofilm carriers enhanced the efficiency of water purification, especially BOD reduction. The combination of the plants, biofilm carriers, and gravel in the wetland filter significantly enhanced (ρ < 0.05) the treatment efficiency in terms of TSS, COD, BOD, Ammonia (NH3), Nitrates (NO3), and Orthophosphate (PO4) compared to the control treatment system (gravel bed). Plant growth was restricted in the presence of carriers in the system. Further study for examining the system performance under summer conditions, which may improve the nutrient reduction rates by biofilm carriers, is underway.

11

Fate and Transfer of Heavy Metals in Constructed Wetland Mesocosms Subjected Different Hydraulic Regime

Mohammed Alya A., Al Chalabi Ahmed S., Sahei Angham O.

Journal of Ecological Engineering

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2022

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Vol. 23, nr 12

44--49

EN

A constructed wetland may consume different levels of pollution in different types of wastewater. The focus of this study was the removal of heavy metals (Pb, Cr, and Cd) by plants and their fate in constructed wetland mesocosms. With hydraulic regime manipulation, heavy metals were retained in the ferric dewatered sludge either by adsorption to the carboxylate groups and iron oxy-hydroxide under anaerobic conditions or by co-precipitation with iron oxy-hydroxide under aerobic conditions. Under anaerobic conditions, most heavy metals accumulate in the bottom layer and decrease when moving to the top one. In turn, under aerobic conditions, most of the heavy metals accumulate in the bottom and top layers. Plants play a minor role in heavy metal removal. About 16% of total heavy metals added to the ferric dewatered treatment sludge were taken up by plants. Roots accumulated roughly 64% of the total lead take up by plants, 66% of the chromium, and 63% of the cadmium, respectively, and passed 36%, 34%, and 37% of the aboveground tissues for harvesting. As a conclusion of this study, when constructed wetland is used, the role of hydraulic regime, substance used, and vegetation should not be ignored in the process of wastewater purification in constructed wetland.

12

Effect of Different Plant Monocultures on Nitrogen Removal Performance in Wetland Microcosms

Wang Rujun, Quan Ying, Zheng ShaoKui, Zhang Xueyu

Journal of Ecological Engineering

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2022

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Vol. 23, nr 9

241--249

EN

This study investigated the nitrogen removal performance in wetland microcosms individually planted with different plant monocultures, including emergent, free-floating and submerged plants during ammonia removals, or large- and small-leaf free-floating plants during nitrate removal. For ammonia-dominated wastewater, both emergent (common reed) and free-floating (water hyacinth) plants in wetland microcosms achieved higher total nitrogen removals than a submerged plant (eelgrass) that significantly improved the microbial nitrifying performance. For nitrate-dominated wastewater, efficient nitrate removals in wetland microcosms planted with free-floating plant were achieved by both a full cover of water surface and the concentration of organic oxygen-consuming substances, which resulted in low dissolved oxygen levels and boosted microbial denitrification in wetland microcosms. FWS-CW developers and managers should thus pay close attention to the selection of wetland plant types and optimize their design to achieve optimum nitrogen removal performance.

13

Treatment of Craft Brewery Sewage with SS VF and FWS Constructed Wetland – Lab Scale Experiment

Dąbrowski Wojciech, Karolinczak Beata, Malinowski Paweł, Lech Magrel

Rocznik Ochrona Środowiska

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2021

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Tom 23

290--300

EN

The problem of wastewater treatment from craft breweries emerged in Poland about 10 years ago when an increase in the number of small breweries was observed. Plants located in small towns are forced to solve the problem on their own. One of the possibilities is to use low-cost technology of constructed wetlands with subsurface and surface flow. The purpose of the research was to test the possibility of effective treatment of sewage from a craft brewery in a lab-scale research installation and to determine the parameters for designing a real scale plant. Wastewater from the Waszczukowe brewery was used in the study. The research system consisted of a retention and aeration tank, SS-VF subsurface flow and FWS surface flow beds. An innovative Certyd filling produced by LSA company was used. The high efficiency of SS-VF bed and the entire research system was found. The removal efficiency in SS VF was on average 89.7% for BOD5, 90.5% for COD, 54.6% for TN and 52.1% for TP. For whole treatment it was respectively 97.1%, 96.7%, 72.6% and 61.3%. A high organic matter removal effect was found for the SS-VF bed (87.1 g BOD5 g m-2 d-1) and a relatively low for the FWS (3.0 BOD5 g m-2 d-1). The study confirmed the need for plant design based on hydraulic load and required load removed per unit area.

14

Plant Diversity in a Constructed Wetland for Pollutant Parameter Processing on Leachate: A Review

Arliyani Isni, Tangahu Bieby Voijant, Mangkoedihardjo Sarwoko

Journal of Ecological Engineering

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2021

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Vol. 22, nr 4

240--255

EN

The leachate from landfill constitutes high pollutant. The high pollutant content impacts the public and ecosystem health surrounding the landfill site. Therefore, it is essential to process the leachate first before its disposal to water body. Landfill leachate processing can be carried out using three processes, i.e., physical-chemical, biological, and a combination of those. A constructed wetland is currently considered as an environmentally friendly technology to tackle water pollution and leachate. Another advantage of a constructed wetland is the low operational cost and natural maintenance, so it can be a solution related to the cost, technical, and operating system problems of conventional processing. This article aimed to discover the characteristic differences of landfill leachate, constructed wetland installation position, and types of plants used in the constructed wetland. This article was written using the literature reviews from experimental studies on water processing with the same parameter for leachate and leachate processing. The literature review result shows that landfill leachate processing depends on different leachate characteristics. The toxic quality of landfill leachate was found through a toxicity test. Leachate treated by the physical-chemical process contains toxic and non-biodegradable organic substances. Hence, the physical-chemical methods should be applied at the beginning of the process and coupled with the biological method at the end of the process to improve the treatment quality. A constructed wetland with diverse plants was found to be more effective in biomass distribution, less prone to seasonal variations, and had a more diverse microbe population than the constructed wetland with a single plant.

15

Performance of Reactive Nitrogen in Leachate Treatment in Constructed Wetlands

Arliyani Isni, Tangahu Bieby Voijant, Mangkoedihardjo Sarwoko

Journal of Ecological Engineering

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2021

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Vol. 22, nr 5

205--213

EN

Reactive Nitrogen (Nr) is produced from natural and human activity, the use of fuel, the activities of industry, and agriculture. The Nr from agriculture is used to produce food crops, but excess Nr has an impact on the surrounding land. Landfills also generate Nr from the decomposition of waste which then releases the leachate containing Nr. This study aimed to determine the value of Nr generated by landfills, the effect of Nr on the environment, and the performance of Nr when used in Constructed Wetlands (CW). Review papers were collected from several studies and publications. Nr commonly found in leachate landfills include: NH4, NH3, NO2, and NO3. The Nr present in landfill leachate at CW can be used for proper plant development and growth, which significantly increases and enhances its quality and yield by playing an important role in the biochemical and physiological functions of plants. In addition, the content of hazardous substances in landfill leachate can also be processed using CW. This review paper discusses the effects of Nr from human activities ending up in landfills. The landfill leachate with Nr content can be used in CW for plant growth.

16

Removal of Pesticides from Wastewater by the Use of Constructed Wetlands

Ignatowicz Katarzyna, Puchlik Monika, Łozowicki Jakub

Journal of Ecological Engineering

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2020

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Vol. 21, nr 1

219--223

EN

The purpose of the work was to determine the efficiency of domestic wastewater treatment contaminated with a mixture of pesticides at varying deposit load. The efficiency of purification in the case of eight pesticides equaled 99.8%, and the removal effect of azoxystrobin reached 93%, while that of thiachloprid – 96%. The constructed wetland ensured high removal of organic matter expressed as BOD and COD, as well as reduction in the concentration of nitrogen and phosphorus compounds. Studies showed a clear impact of the deposit load on the effectiveness of pesticide removal, BOD and COD parameters, total phosphorus, and total nitrogen.

17

Nitrogen and phosphorus content in constructed wetlands

Jakubaszek Anita

Civil and Environmental Engineering Reports

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2020

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Vol. 30, no. 2

247--257

EN

High effectiveness of organic pollutants and nutrients removal is achieved in biological wastewater treatments plants – in case of proper exploitation of these objects. Nitrogen and phosphorus transformation or removal depends on many physic – chemical and biochemical conditions, deposit and environmental factors. A rule for treating wastewater consists in decomposition of organic compounds included in wastewater in water-soil environment. Removing contaminations is performed as a result of sorption of contaminations, bio-chemical oxidation-reduction reactions and biological activity of soil microorganisms and hydrophyte flora. The research has been carried out in the constructed wetland in Małyszyn (1300 EP). The treatment plant operates in horizontal system, with under-surface flow of wastewater.

18

Application of Constructed Wetland for Treating Runoff from the Dairy Cattle Farm Yard

Rossa Ludmiła, Urbaniak Marek, Majewska Zuzanna

Journal of Ecological Engineering

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2019

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Vol. 20, nr 10

225--232

EN

Constructed wetlands (CWs) are becoming a popular solution for the treatment of rainwater discharged from hardened surfaces, because their construction and maintenance does not require large expenditures. The research on the effectiveness of treating runoff from the dairy farm yard was carried out using constructed wetland. The studied wetland was built in the form of two connected reservoirs with an area of 30 m2. In the first deep reservoir, sedimentation of suspended matter occurred, while in the second shallow reservoir, six species of aquatic plants were planted in order to assimilate nitrogen and phosphorus compounds. In the years 2014–2018, the water samples from the inflow and outflow of the constructed wetland were collected. The pH and electrical conductivity values, as well as nitrate nitrogen, ammonium nitrogen, phosphates phosphorus and chlorides concentrations were determined with electrochemical and photometric methods. The obtained results were statistically analyzed using the Statistica v. 7 software. In the majority of the runoff samples from the farmyard, abnormal concentration of ammonium nitrogen (90% of samples) and phosphate phosphorus (100% of samples) occurred in relation to the requirements for surface waters. The values of ammonium nitrogen concentration exceeded the acceptable norms for domestic sewage discharged into waters in 31% of samples and in the case of phosphate phosphorus – in 67% of samples. The concentration of chlorides exceeded the limit values for surface water in 36% of samples. The average concentration of nitrate nitrogen did not exceed these standards. There was a high correlation between the concentration of ammonium nitrogen and the concentration of phosphate phosphorus and chlorides. The efficiency of runoff treatment from the dairy cattle farm yard was very high in the initial period of research, reaching 85.4% for ammonium nitrogen and 68.3% for phosphate phosphorus, but showed a downward trend over time for the entire period.

19

Analysis of COD Fractions in Raw Wastewater Flowing into Small and Large Wastewater Treatment Plants

Ignatowicz Katarzyna

Journal of Ecological Engineering

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2019

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Vol. 20, nr 11

197--201

EN

The aim of the study was to determine and compare the amount and biodegradability of organic compounds determined by the COD measure contained in raw sewage inflowing to small sewage treatment plants and municipal sewage wastewater treatment plants with high personal equivalent (P.E.). Raw sewage samples were collected in three chosen facilities. The research presented in the article were conducted with two small plants: constructed wetland plant with an average capacity of 4 m3/d and the treatment plant with rotary biological contactor (RBC) with an average capacity of 5 m3/d. Also big municipal wastewater treatment plant (WWTP) with activated sludge in Bialystok with a capacity of about 63 000 m3/d was checked. The lowest percentages of dissolved fraction of soluble organic non-biodegradable substances SI was founded in raw sewage in small wastewater treatment plants (CW and RBC).

20

Selection of Mesocosm to Remove Nutrients with Constructed Wetlands

Timotewos M. T., Kassa K., Reddythota D.

Journal of Ecological Engineering

|

2017

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Vol. 18, nr 4

42--51

EN

Oxidizing bacteria in the roots of the plant has a unique ability of absorbing pollutants in the wastewater, thus they considered as a useful method for wastewater treatment. Using three plants, namely Typha, Phragmites australis, and Scirpus, we performed a series of mesocosms experiments in Arba Minch, Ethiopia for the removal of nutrients by constructed wetlands. We observed that the nutrients reached the removal efficiencies of 99.1% for Typha plant, has better removal efficiency than Phragmites australis and Scirpus. The results explore the oxidizing bacteria activity in different plants and that led to enhance the removal efficiency of pollutants in wastewater.