Role of air scouring in anaerobic/anoxic tanks providing nitrogen removal by mainstream anammox conversion in a hybrid biofilm/suspended growth full‐scale WWTP in China

2021 ◽  
Author(s):  
Quan Yuan ◽  
Beiping He ◽  
Liang Qian ◽  
Helen Littleton ◽  
Glen T. Daigger ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Full Scale ◽  
Suspended Growth

Full-Scale Experience for Nitrogen Removal from Piggery Waste

2005 ◽  
Vol 77 (4) ◽  
pp. 381-389 ◽  
Author(s):  
Euiso Choi ◽  
Daehoon Kim ◽  
Youngjin Eum ◽  
Zuwhan Yun ◽  
Kyong-Sok Min
Keyword(s):  
Nitrogen Removal ◽  
Full Scale

Enhancing nitrogen removal efficiency in a dyestuff wastewater treatment plant with the IFFAS process: the pilot-scale and full-scale studies

2017 ◽  
Vol 77 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Yanjun Mao ◽  
Xie Quan ◽  
Huimin Zhao ◽  
Yaobin Zhang ◽  
Shuo Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Full Scale ◽  
Nitrification And Denitrification ◽  
Dyestuff Wastewater

Abstract The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs). The results showed that the effluent chemical oxygen demand (COD), ammonium nitrate (NH4+-N) and total nitrogen (TN) concentrations of the IFFAS process were significantly lower than those of the AS process, and could meet the indirect discharge standards. PCR-DGGE and FISH results indicated that more nitrifiers and denitrifiers co-existed in the IFFAS system, promoting simultaneous nitrification and denitrification. Based on the pilot results, the IFFAS process was used to upgrade the full-scale AS process, and the effluent COD, NH4+-N and TN of the IFFAS process were 91–291 mg/L, 10.6–28.7 mg/L and 18.9–48.6 mg/L, stably meeting the indirect discharge standards and demonstrating the advantages of IFFAS in dyestuff wastewater treatment.

scholarly journals Comprehensive assessment of system performance in a full-scale wastewater treatment plant with an anaerobic/anoxic/aerobic membrane bioreactor combined with the ozonation process

2018 ◽  
Vol 78 (3) ◽  
pp. 690-698
Author(s):  
Dan Wang ◽  
Yihui Wu ◽  
Fang Guo ◽  
Zhiping Li ◽  
Guangxue Wu
Keyword(s):  
Environmental Impact ◽  
Nitrogen Removal ◽  
System Performance ◽  
Membrane Bioreactor ◽  
Linear Regression Analysis ◽  
Oxygen Demand ◽  
Economic Cost ◽  
Full Scale ◽  
Electricity Cost ◽  
Ozonation Process

Abstract The system performance, economic cost and environmental impact of a full-scale anaerobic/anoxic/aerobic/membrane bioreactor (3AMBR) combined with the ozonation process were evaluated. The 3AMBR/ozonation process removed biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids, NH4-N and total phosphorus efficiently, with removal percentages above 94%, while the total nitrogen removal percentage was only 70%. The multiple linear regression analysis showed that hydraulic retention time (HRT) had a significant effect on nitrogen removal. A low HRT benefited nitrogen removal. Ferrous sulfate dosage close to the optimal value and a high mixed liquid suspended solid could enhance the phosphorus removal. The electricity cost accounted for 88% of the total economic costs. Greenhouse gas (GHG) emissions from the BOD oxidation and endogenous decay accounted for more than 50% of total emissions. The second largest GHG emission source was electricity consumption, accounting for 41%. The key to reduce the eutrophication was to enhance nitrogen removal. The composite cost of the 3AMBR/ozonation process was 251 CNY/t CODeq removed, among which economic cost accounted for 82.5%, while environmental impact cost accounted for a small proportion.

scholarly journals The occurrence and role of Nitrospira in nitrogen removal systems

2020 ◽  
Vol 303 ◽  
pp. 122936 ◽  
Author(s):  
Mohamad-Javad Mehrani ◽  
Dominika Sobotka ◽  
Przemyslaw Kowal ◽  
Sławomir Ciesielski ◽  
Jacek Makinia
Keyword(s):  
Nitrogen Removal
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