scholarly journals Effect of adding microorganism and carbon source to substrate on nitrogen removal treating the drainage of WWTP

2019 ◽  
Vol 79 (10) ◽  
pp. 1947-1955 ◽  
Author(s):  
Han Wei ◽  
Li Ting-mei ◽  
Cheng Lu-lu ◽  
Liu Lu ◽  
Yu Lu-ji ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Order Kinetic ◽  
Release Process ◽  
Carbon Release ◽  
The Difference ◽  
Excellent Property

Abstract Developing substrate with carbon release properties is helpful to enhance nitrogen removal in low C/N ratio wastewater treatment. In this study, substrates with and without adding carbon source and microorganism were prepared to treat the drainage effluent from a wastewater treatment plant (WWTP), the difference in nitrogen removal were investigated. The results showed that adding a carbon source and microorganism to substrates could not only increase the amount of chemical oxygen demand (COD) released, but also enhance the adsorption capacities of NH4+-N and NO3–-N. The carbon release process followed the first-order kinetic equation. A nitrogen removal model consisting of four phases of diffusion, adsorption, assimilation and transformation was proposed. In the short term, nitrogen was mainly removed by adsorption; adding microorganism contributed to enhance nitrification and denitrification. In the long-term, nitrogen removal performances were similar whether microorganism was added or not, and microbial species on the surface of substrates were similar. This work suggested when using substrate to treat wastewater for nitrogen removal, preparing a substrate with excellent property for biofilm formation was the most important factor.

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.

Model and Sensor Based Optimization of Nitrogen Removal at Klagshamn Wastewater Treatment Plant

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1315-1323 ◽  
Author(s):  
H. Aspegren ◽  
B. Andersson ◽  
U. Nyberg ◽  
J. la C. Jansen
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
On Line ◽  
Ammonia Sensors

Optimization of wastewater treatment plants with extensive phosphorus and nitrogen removal is complicated. The Klagshamn wastewater treatment plant in Sweden is operated with pre-precipitation of phosphorus with ferric chloride and denitrification with methanol as carbon source. An activated sludge process, operated with pre-precipitation and denitrification with external carbon source in a compartmentalized plant, requires only small tank volumes but increases the need for proper operation and optimization. On-line nitrogen, ammonia, and TOC sensors are used for a day-to-day control and optimization while mathematical modelling is used for long term strategic planning. The on-line measurements are further used as the basis for the modelling. TOC and ammonia sensors at the influent clearly identify typical and extreme loading variations and nitrate measurements in the activated sludge tanks and the effluent shows the dynamics of the processes. These measurements provide a basis for model calibration. In combination low residuals of nitrogen, phosphorus and organic matter can be achieved.

Evaluation of the performance of the Tyson Foods wastewater treatment plant for nitrogen removal

2005 ◽  
Vol 51 (11) ◽  
pp. 159-166
Author(s):  
E. Ubay-Cokgor ◽  
C.W. Randall ◽  
D. Orhon
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Biological Oxygen Demand ◽  
Average Flow Rate ◽  
Before And After

In this paper, the performance of the Tyson Foods wastewater treatment plant with an average flow rate of 6500 m3/d was evaluated before and after upgrading of the treatment system for nitrogen removal. This study was also covered with an additional recommendation of BIOWINTM BNR program simulation after the modification period to achieve an additional nutrient removal. The results clearly show that the upgrading was very successful for improved nitrogen removal, with a 57% decrease on the total nitrogen discharge. There also were slight reductions in the discharged loads of biological oxygen demand, total suspended solids, ammonium and total phosphorus with denitrification, even though the effluent flow was higher during operation of the nitrogen removal configuration.

ANFIS Modelling of Carbon and Nitrogen Removal in Domestic Wastewater Treatment Plant

2014 ◽  
Vol 67 (5) ◽  
Author(s):  
Muhammad Sani Gaya ◽  
N. Abdul Wahab ◽  
Y. M. Sam ◽  
Sahratul Izah Samsudin
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Feed Forward Neural Network ◽  
Anfis Model ◽  
Efficient Operation ◽  
Carbon And Nitrogen

Wastewater treatment plant involves highly complex and uncertain processes, which are quite difficult to forecast. However, smooth and efficient operation of the treatment plant depends on an appropriate model capable of describing accurately the dynamic nature of the system. Most of the existing models were applied to industrial wastewater treatment plants. Therefore, this paper proposed an ANFIS model for carbon and nitrogen removal in the Bunus regional sewage wastewater treatment plant, Kuala Lumpur, Malaysia. For comparison, feed-forward neural network is used. Simulation results revealed that the ANFIS model demonstrated slightly better prediction capability in all the considered variables, chemical oxygen demand (COD), suspended solids (SS) and ammonium nitrogen (NH4-N) as compared to the FFNN model, thus proving that the proposed ANFIS model is reliable and useful to the wastewater treatment plant. 

Factors Affecting Biological Nitrogen Removal Efficiency in a Large Wastewater Treatment Plant

1991 ◽  
Vol 24 (7) ◽  
pp. 121-131 ◽  
Author(s):  
Elzbieta Plaza ◽  
Jan Bosander ◽  
Jozef Trela
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Biological Nitrogen Removal ◽  
Careful Study ◽  
Anoxic Zone ◽  
Biological Nitrogen

The pre-denitrification method, with internal carbon source for biological nitrogen removal, has been studied in full-scale experiments at a large wastewater treatment plant (flow 130,000 m3/d). Factors controlling nitrogen removal, such as fraction of anoxic zone and organic material content in wastewater are discussed. A flexible system with fine bubble membrane disc diffusers made it possible to change the ratio between the volumes for nitrification and denitrification. The denitrification process was limited by lack of organic carbon in the wastewater and increasing the fraction of anoxic zone did not improve the efficiency of the system. With the help of on-line analysers for total nitrogen and chemical oxygen demand, the relationship between the denitrification efficiency and the carbon/nitrogen ratio has been given careful study. The average value for chemical oxygen demand after primary sedimentation was only 130 mg/l and the value for the COD/N ratio was found to be 6.3. The denitrification rate was usually in the range of 1.0 and 2.0 mg NO3-N/g MLVSS h.

Nitrogen removal in multi-stage wastewater treatment plants by using a modified post-denitrification system

1998 ◽  
Vol 37 (9) ◽  
pp. 151-158
Author(s):  
Dieter Schreff ◽  
Peter A. Wilderer
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Feeding Rates ◽  
Multi Stage ◽  
Stage System ◽  
Set Up

Systems in which denitrification follows nitrification (post-denitrification) copy the natural sequence of nitrogen removal. The disadvantage of post-denitrification, however, is that an external carbon source must be added to the denitrification reactor. In the concept discussed in this paper, excess sludge from a high loaded activated sludge plant is used as carbon source and as source of denitrifiers in a three-stage system. The sludge is fed into a anoxic reactor placed in between the nitrification reactor (e.g., trickling filter) and the final clarifier. Two different operation methods were investigated at a pilot-scale system set up at the Ingolstadt wastewater treatment plant. Low nitrate effluent values were obtained at high sludge feeding rates, but at the expense of a significant increase in turbidity and NH4-N effluent concentrations. This problem could be solved by a reduction of the sludge feeding rate and by applying intermittent feeling. The effluent turbidity was kept at an acceptable level, but denitrification was relatively slow in progress. To achieve both low effluent turbidity and low nitrate discharge, a combination of pre- and post-denitrification is recommended.

Enhanced denitrification with methanol at WWTP Zürich-Werdhölzli

1996 ◽  
Vol 33 (12) ◽  
pp. 117-126 ◽  
Author(s):  
I. Purtschert ◽  
H. Siegrist ◽  
W. Gujer
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Yield Coefficient ◽  
Adaptation Period ◽  
Municipal Wastewater Treatment

In coordination with the EU-guidelines the large wastewater treatment plants in Switzerland have to be extended with enhanced nitrogen removal. Due to the existing plant configuration, the low COD/N ratio and dilute wastewater, denitrification supported by an external carbon source instead of extending the plant may be an interesting and cost effective solution for municipal wastewater treatment. At the wastewater treatment plant Zürich-Werdhölzli different experiments were performed with methanol addition to predenitrification from March to July 1994. The aim of this work was to evaluate the use of methanol as an alternative to plant extension to achieve a higher nitrogen removal efficiency. Therefore, two parallel denitrifying lanes were investigated, one served for methanol addition experiments and the other as a control. The effect of oxygen input into the anoxic zone due to influent, return sludge and mixing was investigated, too. The results show that nitrogen removal efficiency can be substantially increased as compared to the reference lane. The adaptation period for methanol degradation was only a few days and the process was relatively stable. Based on total nitrogen in the inflow, the average denitrification was 55% with methanol addition and 35% without methanol. The yield coefficient YCOD was 0.4 g CODX g−1 CODMe. Due to the small net growth rate of the methanol degraders the denitrification capacity is relatively low and nitrate peak loads cannot be fully denitrified. Hence, methanol as a carbon source requires more or less constant dosing. To prevent nitrate limitation, methanol addition should be controlled by the anoxic nitrate concentrations.

scholarly journals ANÁLISE COMPARATIVA ENTRE ESTAÇÕES COMPACTAS E CONVENCIONAIS PARA O TRATAMENTO DE EFLUENTES NO MUNICÍPIO DE DOIS IRMÃOS, RS

2019 ◽  
Vol 10 (2) ◽  
pp. 121
Author(s):  
Cássio Rodrigo Dias Gomes ◽  
Éverton Hansen
Keyword(s):  
Wastewater Treatment ◽  
Conventional Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Rio Grande ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Rio Grande Do Sul ◽  
The Difference

No Brasil, apenas uma pequena parcela do esgoto gerado pelas cidades é devidamente tratado em estações de tratamento de efluentes . O uso de soluções individuais (fossa séptica e sumidouro) é empregado em parte do esgoto gerado, e aproximadamente um terço do esgoto doméstico não possui coleta, tampouco tratamento. O presente estudo foi desenvolvido no município de Dois Irmãos, no Rio Grande do Sul. O município avaliado encontra-se em crescimento, com a implantação prevista de novos condomínios residenciais. Desta forma, o uso de estações compactas para o tratamento de efluentes líquidos foi avaliado, verificando sua eficiência e viabilidade econômica, em comparação com a tecnologia de fossa séptica e filtro anaeróbio coletivos, convencionalmente utilizada pelo município (estação de tratamento convencional). O trabalho mostra de forma comparativa, os custos de implantação, operação e manutenção, além de trazer as informações sobre a eficiência dos sistemas de tratamento de efluentes, quais sejam estação de tratamento compacta e estação de tratamento convencional. A questão mais relevante quando se compara os dois sistemas é a diferença no custo de implantação, onde o sistema compacto analisado seria até 81,22% mais econômico do que o convencional. Além da questão econômica, a eficiência do sistema compacto mostra-se superior ao sistema convencional. A estação compacta apresentou 97,97% de remoção de demanda bioquímica de oxigênio, enquanto a estação convencional removeu 77,67% do mesmo parâmetro. Palavras-chave: Estação de Tratamento de Efluente. ETE Compacta. ETE Convencional.ABSTRACTIn Brazil, only a small portion of the sewage generated by the cities is properly treated in wastewater treatment plants. The use of individual solutions (septic tank and sump) is used in part of the generated sewage, and approximately one-third of the domestic sewage has no collection or treatment. The present study was developed in the city of Dois Irmãos, Rio Grande do Sul. The evaluated municipality is growing, with the expected implementation of new residential condominiums. Thus, the use of compact stations for the treatment of liquid effluents was evaluated, verifying their efficiency and economic viability, in comparison with the technology of collective septic tank and anaerobic filter, conventionally used by the municipality (conventional treatment station). The work compares the implementation, operation and maintenance costs, as well as information on the efficiency of wastewater treatment systems (compact treatment plant and conventional treatment plant). The most relevant issue when comparing the two systems is the difference in deployment cost, where the compact system analyzed would be up to 81.22% more economical than the conventional one. Besides the economic issue, the efficiency of the compact system is superior to the conventional system. The compact station showed 97.97% of biochemical oxygen demand removal, while the conventional station removed 77.67% of the same parameter.Keywords: Effluent Treatment Station. Compact STE. Conventional STE.

Operational Results of the Wolfsburg Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 203-209 ◽  
Author(s):  
R. Kayser ◽  
G. Stobbe ◽  
M. Werner
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Total Nitrogen Content ◽  
Activated Sludge Process

At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.

Nitrogen removal from wastewater treatment lagoons

1999 ◽  
Vol 39 (6) ◽  
pp. 191-198 ◽  
Author(s):  
Timothy J. Hurse ◽  
Michael A. Connor
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Ammonia Removal ◽  
Contour Plot ◽  
Removal Mechanism ◽  
Dissolved Oxygen Concentration ◽  
Physical Processes ◽  
Contour Plots ◽  
Removal Processes

In an attempt to gain a better understanding of ammonia and nitrogen removal processes in multi-pond wastewater treatment lagoons, an analysis was carried out of data obtained during regular monitoring of Lagoon 115E at the Western Treatment Plant in Melbourne. To do this, a contour plot approach was developed that enables the data to be displayed as a function of pond number and date. Superimposition of contour plots for different parameters enabled the dependence of ammonia and nitrogen removal rates on various lagoon characteristics to be readily assessed. The importance of nitrification as an ammonia removal mechanism was confirmed. Temperature, dissolved oxygen concentration and algal concentration all had a significant influence on whether or not sizeable nitrifier populations developed and persisted in lagoon waters. The analysis made it evident that a better understanding of microbial, chemical and physical processes in lagoons is needed before their nitrogen removal capabilities can be predicted with confidence.

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