A study on the migration and transformation law of nitrogen in urine in municipal wastewater transportation and treatment

2013 ◽  
Vol 68 (5) ◽  
pp. 1072-1078 ◽  
Author(s):  
Ren Wuang ◽  
Jin Pengkang ◽  
Liang Chenggang ◽  
Wang Xiaochang ◽  
Zhang Lei
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Influencing Factors ◽  
Total Nitrogen ◽  
Human Urine ◽  
Municipal Wastewater ◽  
Ammonia Nitrogen ◽  
Septic Tank ◽  
Transformation Rate ◽  
Municipal Wastewater Treatment

Many studies suggest that the total nitrogen (TN) in urine is around 9,000 mg/L and about 80% of nitrogen in municipal wastewater comes from urine, because nitrogen mainly occurs in the form of urea in fresh human urine. Based on this fact, the study on the migration and transformation law of nitrogen in urine and its influencing factors was carried out. It can be seen from the experimental results that the transformation rate of urea in urine into ammonia nitrogen after standing for 20 days is only about 18.2%, but the urea in urine can be hydrolyzed into ammonia nitrogen rapidly after it is catalyzed directly with free urease or indirectly with microorganism. Adding respectively a certain amount of urease, activated sludge and septic-tank sludge to urine samples can make the maximum transformation rate achieve 85% after 1 day, 2 days and 6 days, respectively. In combination with some corresponding treatment methods, recycling of nitrogen in urine can be achieved. The results are of great significance in guiding denitrification in municipal wastewater treatment.

The Mechanism of Nitrogen Removal in Domestic Sewage of High Ammonia Nitrogen by Three-Step Series Constructed Rapid Infiltration System

2011 ◽  
Vol 356-360 ◽  
pp. 1248-1252
Author(s):  
Ai Bin Kang ◽  
Ying Qiang Yao ◽  
Yu Long Dong
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Domestic Sewage ◽  
Municipal Wastewater Treatment ◽  
High Ammonia ◽  
Nitrite Oxidizing Bacteria

The removal and mechanism of ammonia nitrogen and total nitrogen were studie through three-step series of constructed rapid infiltration system by using high ammonia nitrogen domestic sewage of students' living area in a university. The result shows that the removal rate of ammonia nitrogen is 94.47% by using this system, which is 3% higher than conventional rapid infiltration system.The effluent can meet the standard Ⅰ—A of “Discharge standard of pollutants for municipal wastewater treatment plant(GB 18918-2002)”. The amount of ammonium oxidizing bacteria, nitrate oxidizing bacteria, nitrite oxidizing bacteria in this system is higher than that in conventional rapid infiltration system. The correlation between the removal of ammonia nitrogen and ammonium oxidizing bacteria, nitrate oxidizing bacteria, nitrite oxidizing bacteria is significant. The removal rate of total nitrogen is 47.38% by using this system, which is 20.72% higher than that in conventional rapid infiltration system. However, the effluent still can not meet the standard Ⅰ—A of “Discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002)”. The amount of denitrifying bacteria in the three-step subsystem increased significantly, which improves the removal of total nitrogen. The correlation between the removal of TN and denitrification bacteria is significant.

Treatment of Domestic Wastewater by A/O Biofilm Process of Silicon-Based Zeolite Filter Material

2013 ◽  
Vol 457-458 ◽  
pp. 76-80
Author(s):  
Juan Ting Wang ◽  
Yan Zhen Yu ◽  
You Heng Zhao
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Municipal Wastewater ◽  
Filter Material ◽  
Ammonia Nitrogen ◽  
Operating Conditions ◽  
Municipal Wastewater Treatment ◽  
Biofilm Process ◽  
Silicon Based ◽  
Nitrogen Phosphorus

Under the condition that the temperature between 20 °C ~ 27 °C, in stable operation period, the effect of the anoxic and aerobic tanks which presented in municipal wastewater treatment using orthogonal experiment, and optimum conditions of A /O Biofilm Process of Silicon-based zeolite Filter Material were studied: the gas-water ratio 1:2, and the reflux ratio of digestive juice 1:2 and hydraulic retention time (HRT) for the 2h.Under this operating conditions, the removal rate of total nitrogen, phosphorus and ammonia nitrogen are respectively up to 73.57%, 64% and 85.28%. The concentrations of total nitrogen, phosphorus and ammonia nitrogen can be respectively reduced to 18.75mg/L, 1.06mg/L and 3.94mg/L in the ultimate effluent, which meet standard B of the first class in National discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002).

Design and operation of a wastewater treatment plant treating low concentration of municipal wastewater

1998 ◽  
Vol 38 (3) ◽  
pp. 167-172
Author(s):  
Jin Duanyao ◽  
Wang Baozhen ◽  
Wang Lin
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Ammonia Nitrogen ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Foshan City

The Zhen'an Wastewater Treatment Plant in Foshan City, Guangdong Province, China is a newly built large municipal wastewater treatment plant in south China, situated in the southeast of the famous ancient Foshan City, has a treatment capacity of 100,000 m3/d, serves an area of 32 km2 and 220,000 P. E., occupies 7 ha area with a total investment of 220 million RMB (about 26.5 million U.S dollar), which was put into operation in December 1995. As it is difficult to design and operate the wastewater treatment plant because of the low organic concentration of its influent, the simplified A/O activated sludge process without primary treatment for simultaneous removal of phosphorus and ammonia nitrogen was employed to design the plant, by which, the wastewater is treated very well, with higher effluent quality than the traditional activated sludge process, while the capital and O/M costs are lower than the latter.

Treatment of High Salinity Wastewater Using an Intermittently Aerated Membrane Bioreactor

2015 ◽  
Vol 1092-1093 ◽  
pp. 1033-1036
Author(s):  
Kang Xie ◽  
Jing Song ◽  
Si Qing Xia ◽  
Li Ping Qiu ◽  
Jia Bin Wang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
High Salinity ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Municipal Wastewater Treatment ◽  
Removal Efficiencies ◽  
Salinity Wastewater

In this study, high salinity wastewater was treated by an intermittently aerated membrane bioreactor (IAMBR) and the salinity loadings were set at 35g/L. The activated sludge was inoculated from the municipal wastewater treatment plant. The influent salinity level gradually increased from 0 to 35 g/L with every 5 g/L. With the salt concentration increased to 35 g/L, the performance of IAMBR was significantly affected by higher salinity. The removal efficiencies of the total organic carbon (TOC), ammonia nitrogen (NH4+-N) and total nitrogen (TN) were about 83%, 70% and 51%, respectively. It is indicated that the domestication of activated sludge from municipal wastewater treatment cannot obtain a better performance at high salinity.

Municipal wastewater treatment in Berlin with deep tanks and flotation for secondary clarification

1996 ◽  
Vol 33 (12) ◽  
pp. 199-210
Author(s):  
R. Gnirss ◽  
A. Peter-Fröhlich ◽  
V. Schmidt
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Energy Requirements ◽  
Municipal Wastewater Treatment ◽  
Space Saving ◽  
Process Energy ◽  
Near Future ◽  
Interesting Alternative ◽  
Pilot Tests

For municipal wastewater treatment, space-saving 10m deep activated sludge tanks are an interesting alternative to conventional tanks of shallow construction. Results from pilot tests in the Berlin-Ruhleben WWTP have shown that the biological P-elimination, nutrification and denitrification processes can be implemented as in shallow tanks. However, the activated sludge did not settle satisfactorily. Flotation was implemented in the process for secondary clarification and in the meanwhile has shown to be advantageous. Tests run over a period of some years with the pilot plant have proven the feasibility of this process. Energy requirements for both systems were found to be approximately the same. A cost estimate based on a preplan revealed a 10% advantage in favour of the 10m WWTP with flotation. For these reasons, one 10m WWTP with flotation for secondary clarification and a capacity of 80,000 m3/d will be built in Berlin in the near future.

PARAMETERS FOR DYNAMIC SIMULATION OF W ASTEW ATER TREATMENT PLANTS WITH HIGH-RATE AND LOW-RATE ACTIVATED SLUDGE TANKS

1994 ◽  
Vol 30 (4) ◽  
pp. 211-214 ◽  
Author(s):  
E. Brands ◽  
M. Liebeskind ◽  
M. Dohmann
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Dynamic Simulation ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
High Rate ◽  
Yield Coefficient ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plants ◽  
Low Rate

This study shows a comparison of important parameters for dynamic simulation concerning the highrate and low-rate activated sludge tanks of several municipal wastewater treatment plants. The parameters for the dynamic simulation of the single-stage process are quite well known, but parameters for the high-ratellow-rate activated sludge process are still missi ng, although a considerable number of wastewater treatment plants are designed and operated that way. At present any attempt to simulate their operation is restricted to the second stage due to missing data concerning growth rate, decay rate, yield coefficient and others.

Characterization of wastewater and activated sludge from European municipal wastewater treatment plants using the NUR test

1998 ◽  
Vol 38 (1) ◽  
pp. 303-310 ◽  
Author(s):  
V. Naidoo ◽  
V. Urbain ◽  
C. A. Buckley
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Batch Tests ◽  
Denitrification Kinetics ◽  
Municipal Wastewater Treatment Plants

Denitrification kinetics and wastewater characterization of eight different plants in Europe are discussed. Denitrification batch tests revealed three distinct rates except in the cases of Plaisir, Rostock and Orense where 4 rates were observed. The latter three plants revealed atypical rapid initial rates which were between 7 and 21 mgN/gVSS.h. All denitrification kinetics under non-limiting carbon conditions revealed fast first rates which ranged between 3.0 and 7.3 mgN/gVSS.h. Acetate was used to simulate denitrification kinetics with readily biodegradable COD present. Two subsequent rates were observed. Rates 2 and 3 ranged between 2 and 3 mgN/gVSS.h, and 1 and 2 mgN/gVSS.h, respectively. The RBCOD fraction varied between 10 and 19%, except for one of the plants where the value determined was 7%.

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