Wyniki wyszukiwania - BazTech

1

Efficient and Sustainable Remediation of Refinery Wastewater Using Electrocoagulation and Advanced Oxidation Techniques

Albrazanjy Mohammed G., Hasan Muayad M., Al-Jadir Thaer, Kadhim Wafaa A, Rahim Mohd Hasbi Ab., Al-Rubaiey Najem A.

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 3

197--210

EN

Effluent wastewater from industrial processes needs to be properly treated before being discharged into the environment. Conventional procedures for handling this wastewater can be problematic due to the presence of toxic elements, time constraints, and complexity. However, a new electrochemical procedure has been developed as an effective method for remediation. In a recent study, refinery wastewater was successfully treated using an electrochemical technique combined with ultrasonic irradiation and photocatalysis. The study found that electrocoagulation, which uses cheap and recyclable metal electrodes, was a simple, efficient, practical, and cost-effective way to handle refinery wastewater. Various parameters were investigated, including electrode metals, operating time, applied voltage, pH, inter-electrode gap, and temperature. The aim was to determine the optimal configuration for pollutant removal. The study also focused on the synergistic effects of combining electrocoagulation and photocatalysis to improve the efficiency of contaminant removal in oily wastewater. By integrating these two treatment technologies, the researchers aimed to enhance pollutant removal rates, energy efficiency, and overall system performance. The research provided valuable insights into the feasibility, optimization parameters, and applicability of the electrocoagulation-photocatalysis process for remediating organic contaminants in oily wastewater industrial effluents. The results showed that electrocoagulation, especially when combined with ultrasonic irradiation and TiO2 photocatalysis, was highly effective in pollutant removal within a short timeframe. These findings support the implementation of this procedure for remediating most industrial wastewater.In conclusion, the study contributes to the development of more effective and sustainable water treatment strategies. The electrocoagulation-photocatalysis process shows promise in addressing the remediation of organic contaminants in oily wastewater from industrial processes.

2

Katalityczne zgazowanie stężonych ścieków zaolejonych w warunkach nadkrytycznych

Gao Ming, Xu Junjie, Chu Zhuzhuan, Li Hui, Su Hao

Przemysł Chemiczny

|

2023

|

T. 102, nr 10

1008--1012

PL

Do oczyszczania ścieków zawierających olej (zawartość 4000 mg/L) zastosowano katalityczne zgazowanie w warunkach nadkrytycznych. Katalizator nano-CuO został przygotowany i użyty (2 mg/L) w obecności H₂O₂ (do 300 mg/L). Katalizator wykazał wysoką aktywność w degradacji olejów zawartych w ściekach. Przy pH 11 i w temp 445°C wartość ChZT ścieków zmniejszyła się o 95,6% po 25 min oczyszczania.

EN

The catalytic supercrit. gasification was used to purify the oil-containing wastewater (oil content 4000 mg/L). The nano-CuO catalyst was prepd. and used (2 mg/L) in presence of H₂O₂ (up to 300 mg/L). The catalyst showed high activity in degrdn. of the wastewater-contained oils. At pH 11 and temp. 445°C, the COD of the wastewater decreased by 95.6% after 25 min long treatment.

3

A cyclonic-static micro bubble flotation column for enhancing coalescence of oil droplets from emulsion

Li X., Yan X., Zhang H.

Physicochemical Problems of Mineral Processing

|

2017

|

Vol. 53, iss. 1

307--320

EN

In this work a novel cyclonic-static micro bubble flotation column, using hydraulic separator with a conventional flotation column, was developed to separate oil droplets from emulsions. The system integrated the cyclonic and laminar flow coalescence with the pipe flow coalescence. The effect of process parameters such as circulation pressure, aeration rate, feed volumetric flow rate and viscosity of fluid on the efficiency of multi-flow pattern coalescence was investigated. The obtained results indicated that the coalescence efficiency increased with the circulation pressure, feed volumetric flow rate and aeration rate, whereas an increase in viscosity of fluid reduced the extent of coalescence. Besides, the size distribution of oil droplets in the cyclonic separator, pipe flow section and column flotation section were simulated in the flotation column using a special software. The simulation was compared with experimental data on the mean size of oil droplets.

4

Performance and selectivity of ceramic membranes in the ultrafiltration of model emulsion in saline

Ćwirko K., Kalbarczyk-Jedynak A.

Management Systems in Production Engineering

|

2017

|

nr 2 (25)

88--92

EN

Oily wastewaters from different onshore and offshore installations and from maritime transport pose a serious threat to the environment so they must be treated by multistage separation also including membrane processes. The main advantages of such membranes are high performance and selectivity, high resistance for temperature and pressure, resistance for acids, bases and solvents, long service life and for application – significant reduction of industries and transport environmental impact. This work presents the results of the process of separation of oil from the emulsion with NaCl addition. Research was performed with a use of laboratory installation with ceramic 300 kDa membrane. The analysis concerned performance and selectivity of a membrane in the function of time and test results have been subsequently compared with the requirements of the IMO.

PL

Wody zaolejone pochodzące z morskich i lądowych instalacji oraz transportu morskiego stanowią poważne zagrożenie dla środowiska, co sprawia że muszą być oczyszczane wieloetapowo, także z wykorzystaniem procesów membranowych i membran nieorganicznych. Głównymi zaletami takich membran są wysoka wydajność i selektywność, duża odporność na temperaturę i ciśnienie, odporność na kwasy, zasady i rozpuszczalniki, długa żywotność – a przy ich stosowaniu znaczące zmniejszenie oddziaływania przemysłu i transportu na środowisko. Praca przedstawia wyniki procesu separacji oleju z emulsji z dodatkiem NaCl. Badania doświadczalne zostały przeprowadzone z wykorzystaniem instalacji laboratoryjnej oraz membrany ceramicznej o średnicy 300 kDa. Wykonane analizy dotyczyły wydajności i selektywności badanej membrany w zależności od czasu, a wyniki analiz zostały następnie porównane z wymaganiami IMO.

5

Projekt separatora zanieczyszczeń olejowych ze stacji benzynowej

Kościelnik B., Kalasiński Ł.

Inżynieria Ekologiczna

|

2016

|

Nr 48

113-118

PL

Ścieki zaolejone są niebezpieczne dla środowiska, ponieważ mogą one skazić wody gruntowe czy powierzchniowe, co może doprowadzić do skażenia biosystemu czy zatrucia człowieka i zwierząt. W skład ścieków tego rodzaju mogą wchodzić substancje ropopochodne czyli substancje pochodzące z gazu ziemnego, ropy naftowej, asfaltu czy też wosku ziemnego. Oczywiście w ściekach zaolejonych nie można zapomnieć także o olejach roślinnych używanych w gastronomi. Ścieki tego typu aby je oczyścić poddaje się następującym procesom: flotacji, sedymentacji, filtracji, wypływaniu, metodom termicznym, biodegradacji, adsorpcji czy chemicznym i termicznym metodom destabilizacji emulsji. Celem niniejszej pracy było zaprojektowanie separatora zanieczyszczeń pochodzących ze stacji benzynowej. W niniejszej pracy zaprezentowano również koszty inwestycyjne i eksploatacyjne. W projektowaniu systemu doczyszczającego dobrano poszczególne węzły technologiczne opierając się na wymaganiach jakościowych ścieków określonych w PN – EU 858.

EN

Oily wastewater are dangerous for the environment, because they can contaminate ground water or surface, which can lead to contamination of the biosystem or poisoning of humans and animals. The treatment plant of this kind may include petroleum products or substances derived from natural gas, crude oil, asphalt or natural wax. Of course, in the wastewater oily you cannot forget about vegetable oils used in catering. Waste water of this type to be cleaned are subjected to the following processes: flotation, sedimentation, filtration, flowing out, thermal methods, biodegradation, adsorption or chemical and thermal methods to destabilize the emulsion. The aim of this study was to design a separator pollution from the gas station. We present the investment and operating costs. In designing the system chosen individual process units based on the requirements of the quality of wastewater specified in PN - EU 858.

6

Oczyszczanie ścieków ze stacji naprawy samochodów

Piecuch T., Andriyevska L., Dąbrowski J., Dąbrowski T., Juraszka B., Kowalczyk A.

Rocznik Ochrona Środowiska

|

2015

|

Tom 17, cz. 1

814--832

EN

The paper presents exploratory examinations on possibility of pre-treatment of wastewater containing gasoline and diesel fuel, that is wastewater “produced” in each car service and repair workshop and in gas station. It is a vast number of service points, which, though daily produce small amounts of wastewater but in the scale of the whole country amount of wastewater is substantial. Such wastewater is usually piped off into the sewage system. Often oily wastewater does not meet requirements set by local companies which own the municipal sewage treatment plants. Therefore, authors made have undertaken considerations on the concept of use the flotation process for pre-treatment of wastewater containing oil and gasoline, as a small wastewater treatment plant that could be installed in a separate room of garage or gas station. Example diagram is shown in Figure 5. This paper presents preliminary testing of a pilot-distinctive nature. Laboratory tests of flotation process were carried out in two independent study groups, ie. one with use of model wastewater and second with the use of real wastewater. Conducted examinations and analysis of the results allow to draw certain conclusions: 1. Wastewater from car service stations, mechanical garages and also gas stations are contaminated with oil derived compound, and although individual garage produces small amounts of wastewater, the sum of all wastewater in the scale of the whole country each day is substantial. 2. Proposed small installation for pre-treatment of oily wastewater, when implemented In the car service station or gas station will improve quality of wastewater daily inputted to sewage system. 3. The flotation process which is the first node of proposed technological installation does not treat wastewater sufficiently, but noticeably, and thus it allows to extend the life of an important node of the installation, that is sorption process. 4. Research should be continued on a small experimental plant installed in the car or gas station.

7

The oily wastewater treatment using the nanofiltration process

Orecki A., Tomaszewska M.

Polish Journal of Chemical Technology

|

2007

|

Vol. 9, nr 4

40-42

EN

The objective of this work was to investigate the possibility of oily wastewater treatment using the nanofiltration (NF) process. The NF studies were carried out with a permeate obtained from ultrafiltration (UF) (used for the treatment of the oily wastewater from metal industry). The influence of transmembrane pressure on a permeate flux, the degree of the rejection of oil and inorganic compounds was investigated. The studies on the NF treatment of oily wastewater demonstrated a high effectiveness of the rejection of oil and inorganic compounds. The permeate obtained from the treatment was free of oil. Moreover, the retention coefficient of the inorganic compounds was higher than 75% for all the cations examined (Na+, K+, Mg2+, Ca2+, Zn2+, Cu2+) and higher than 95% for sulphates. Therefore, the permeate obtained in the NF process can be reused for fresh emulsion preparation.