Evaluation of efficiency of wastewater treatment process in Prague city treatment plant.

Mostafa Nagi Ramadan Bakri

Master's thesis

Comparison of efficiency of wastewater treatment process in a big and small city sewage treatment plant

Abstract:

This study aims to evaluate the efficiency of wastewater treatment at Prague Waste wastewater treatment plant (Prague WWTP) through analysing the influents and effluents for the period from March to December 2014. Two samples were taken on monthly basis for each; influents and effluents, and selected indicators were measured in two reputations. Results were compared to small WWTP close to Prague in order to remark our results. Results were obtained from the Small WWTP for the same period. Data were statistically contrasted and analysed to test the hypothesis; complying with the required limits, whether inflow contamination plays a key role for effluents concentration, and fluctuation through different climatic seasons through the year. Data from CULS meteorological station were used to test the possible effects on wastewater composition during storm events. Average removals were compared for different parameters. It was found that the discharged effluents samples were complying with the standards set by regulating authorities in EU. The average removal for chemical oxygen demand (COD) was found to be 73 % for Prague WWTP compared to 95 % for the small WWTP. Ammonium and nitrite removal was 87 % and 56 % for Prague WWTP respectively, whereas ammonium and total N was 99.6 %, 85 % for the small WWTP respectively. Phosphate ions removal was 72 % for Prague WWTP, while for the small WWTP total Phosphorous was found to be 97 %. From these results we can say that removal efficiency in the small WWTP was better than Prague WWTP. The correlation between effluents and influents concentration was tested in the selected parameters and only conductivity, COD, nitrites, chlorides and acid capacity have witnessed strong positive correlation. On the other hand, no significant correlation was found for the results from the small WWTP except ammonium content which witnessed strong positive correlation between inflow and outflow. Strong positive correlations were existing between the indicators in the analysed influents samples for Prague WWTP; i.e., between conductivity and both of pH, chlorides and phosphate. In contrast, small WWTP influents' samples witnessed strong positive correlation between organic load parameters, such as ammonium, COD, BOD, total N and total P.

Abstract:

This study aims to evaluate the efficiency of wastewater treatment at Prague Waste wastewater treatment plant (Prague WWTP) through analysing the influents and effluents for the period from March to December 2014. Two samples were taken on monthly basis for each; influents and effluents, and selected indicators were measured in two reputations. Results were compared to small WWTP close to Prague in order to remark our results. Results were obtained from the Small WWTP for the same period. Data were statistically contrasted and analysed to test the hypothesis; complying with the required limits, whether inflow contamination plays a key role for effluents concentration, and fluctuation through different climatic seasons through the year. Data from CULS meteorological station were used to test the possible effects on wastewater composition during storm events. Average removals were compared for different parameters. It was found that the discharged effluents samples were complying with the standards set by regulating authorities in EU. The average removal for chemical oxygen demand (COD) was found to be 73 % for Prague WWTP compared to 95 % for the small WWTP. Ammonium and nitrite removal was 87 % and 56 % for Prague WWTP respectively, whereas ammonium and total N was 99.6 %, 85 % for the small WWTP respectively. Phosphate ions removal was 72 % for Prague WWTP, while for the small WWTP total Phosphorous was found to be 97 %. From these results we can say that removal efficiency in the small WWTP was better than Prague WWTP. The correlation between effluents and influents concentration was tested in the selected parameters and only conductivity, COD, nitrites, chlorides and acid capacity have witnessed strong positive correlation. On the other hand, no significant correlation was found for the results from the small WWTP except ammonium content which witnessed strong positive correlation between inflow and outflow. Strong positive correlations were existing between the indicators in the analysed influents samples for Prague WWTP; i.e., between conductivity and both of pH, chlorides and phosphate. In contrast, small WWTP influents' samples witnessed strong positive correlation between organic load parameters, such as ammonium, COD, BOD, total N and total P.

Keywords

NO3-, sewage treatment, waste water, NH4+, NO2-

Keywords

NO2-, sewage treatment, waste water, NH4+, NO3-, total phosphorous, COD, dissolved inorganic salts

Language used: English

Date on which the thesis was submitted / produced: 10. 4. 2015

Thesis defence

• Supervisor: prof. Ing. Jaromír Lachman, CSc.

Czech University of Life Sciences Prague

Faculty of Agrobiology, Food and Natural Resources

Master programme / field:
Natural Resources and Environment / Natural Resources and Environment