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1

Application of Anaerobic-Aerobic Combined Bioreactor in Phosphorus Removal

Kavousi Rezvan, Borghei Seyyed Mehdi

Geomatics and Environmental Engineering

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2023

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Vol. 17, no. 6

111--127

EN

A two-stage anaerobic-aerobic sequencing reactor system was developed in order to enhance the removal of biological phosphorus in the sequencing of combined reactors. Combining both aerobic and anaerobic designs in one reactor improved the efficiency and reduced the construction and operating costs. The combination of an upflow anaerobic fixed bed (UAFB) and a floating activated sludge aerobic bioreactor was designed with respective Kaldnes packing ratios of 90 and 30% for the anaerobic and aerobic sections. The controlled parameters were pH levels within a neutral range, a temperature of 37°C, mixed liquor suspended solids (MLSS) of 1220 and 1030 mg/L for the aerobic and anaerobic sections, respectively, and an attached growth that was equal of 743 and 1190 mg/L for the aerobic and anaerobic sections, respectively. Tests were conducted for three different initial phosphorus concentrations (12.8, 32.0, and 44.8 mg/L), two different volumes for each section, and four chemical oxygen demands (CODs) (500, 1000, 1200, and 1400 mg/L). The results demonstrated that, generally, the phosphorus removal in the anaerobic section fell significantly by increasing the inlet COD, and the maximum removal occurred at COD = 500 mg/L. More than 90% of the phosphorus was removed in the aerobic section at COD = 500 mg/L. In other words, the best performance of the reactor was when the ratio of the COD : N : P = 100 : 5 : 2, composition of phosphorus in industrial wastewater.

2

An Application of Anaerobic-Aerobic Combined Bioreactor Efficiency in COD Removal

Kavousi Rezvan, Borghei Seyyed Mehdi

Geomatics and Environmental Engineering

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2023

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Vol. 17, no. 4

5--18

EN

Over the past few decades, anaerobic-aerobic wastewater treatment systems have been widely used in industrial and municipal wastewater treatment. This study was conducted to examine the effects of combined anaerobic-aerobic bioreactors in the removal of chemical oxygen demands (COD) while reducing phosphate concentrations in synthetic wastewater. In this project, a bioreactor with the dimensions of 10 cm × 10 cm × 80 cm with respective Kaldnes packing ratios of 90 and 30% for the anaerobic and aerobic sections was designed. A combined anaerobic-aerobic reactor’s structure made changing hydraulic retention times only possible by adjusting the volume of its aerobic and anaerobic sections. In the first case, the anaerobic and aerobic sections of the reactor occupied 30 and 50 cm of its height, respectively. The height of the anaerobic section decreases to 12.5 cm in the second case. In aerobic and anaerobic sections, pH was within a neutral range, temperature was 37°C. MLSS (mixed liquor suspended solids) was 1220 and 1030 mg/L, and attached growth was 743 and 1190 mg/L respectively. In order to evaluate COD in the wastewater, three different initial phosphorus concentrations were tested: 12.8, 32.0 and 44.8 mg/L, as well as four COD: 500, 1000, 1200 and 1400 mg/L. Considering the results, COD removal is greater than 80% when the valve 2 is in the anaerobic section outlet regardless of the concentration of phosphate. In this case, the best result is for inlet COD of 500, where the reactor can eliminate more than 90%. When the COD concentration reaches 1000 to 1400 ppm, the reactor’s COD removal efficiency declines to 60%.

3

The influence of hydraulic loading on biofilm properties in a subsurface wastewater infiltration system

Zhang L., Yang J.

Archives of Environmental Protection

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2016

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Vol. 42, no. 4

70--79

EN

In this study, a pilot-scale subsurface wastewater infiltration system (SWIS) was deployed to study landscape water treatment. The goal of the study was to investigate the effects of hydraulic loading on pollutant removal and the spatial distribution of biofilm properties in SWIS. Results showed that the efficiencies of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal degraded as hydraulic loading increased. Furthermore, quantities of the biofilm properties parameter s increased with the hydraulic loading. Polysaccharide and protein levels ranged from 560 to 1110 μg/g filler and 60 to 190 μg/g filler, respectively, at a hydraulic loading of 0.2 m/d. At a hydraulic loading of 0.4 m/d, the quantities of polysaccharide and protein ranged from 1200 to 3300 μg/g filler and 80 to 290 μg/g filler, respectively. Biofilm intensity and biofilm activity per unit weight decreased with the increase in hydraulic loading.

4

Zmienność i zakres temperatury ścieków w niedociążonych hydraulicznie bioreaktorach przepływowych

Bugajski P.

Gaz, Woda i Technika Sanitarna

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2013

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Nr 2

42--44

PL

Przedstawione wyniki badań przedstawiają zakres oraz zmienności temperatury ścieków w otwartych bioreaktorach przepływowych niedociążonych hydraulicznie. W obu bioreaktorach występowały duże wahania temperatury ścieków od 6°C do 19 °C. Stwierdzono duży wpływ temperatury powietrza atmosferycznego na temperaturę ścieków w bioreaktorach. Stwierdzono, iż wraz ze zmianą temperatury powietrza atmosferycznego o 1°C następuje zmiana temperatury ścieków o 0,40°C w bioreaktorze A i o 0,38°C w bioreaktorze B.

EN

The results of the researches showed range and variability of sewage temperature in open flow hydraulically underloaded bioreactor. In both reactors great range of sewage temperature amounted from 6°C to 19 °C were observed. It was ascertained a great influence of air temperature on sewage temperature in bioreactors. Also, together with change of air temperature about 1°C a change of sewage temperature about 0,4°C in Al bioreactor and 0,3 8°C in В bioreactor were observed.

5

Analiza obciążenia hydraulicznego systemu kanalizacyjnego w skali dużej zlewni miejskiej

Zawilski M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2012

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z. 59, nr 2/I

237--247

PL

W artykule przedstawiono analizę wyników modelowania ogólnospławnego systemu kanalizacji ogólnospławnej dla zlewni o dużej powierzchni. Zastosowano program SWMM v.5.0 zaadaptowany do wprowadzania opadu o intensywności przestrzennie zmiennej. Symulację funkcjonowania systemu kanalizacyjnego przeprowadzono dla rzeczywistych zlewni w Łodzi przy wykorzystaniu danych z monitoringu opadów na terenie miasta w roku 2010 i 2011. Na tej podstawie porównano wyniki obliczeń dla opadów przestrzennie zmiennych oraz punktowych zadanych dla całej zlewni. Ta ostatnia opcja prowadzić może do istotnego zawyżania lub zaniżania wyników obliczeń.

EN

This article presents the results of computer simulations of existing combine sewerage system with the use of the SWMM v.5.0 software. The software input format has been adopted for the case of spatially distributed rainfalls. Rainfall data obtained from a municipal monitoring system were used for modeling runoff from two large urban catchments in Łódź. On the basis of the results, the comparison of flows obtained for the spatially distributed and standard static rainfalls has been made. It was demonstrated that the option of static rainfalls usually leads to significant overestimation of flows (however in some case underestimation is also possible). For that reason, there is an urgent need to verify the present rules and methods for dimensioning sewerage systems draining large urban catchments.