Deposition pattern, effect on nitrogen removal and component analysis of deposited sludge in a carrousel oxidation ditch

This study was performed to increase the treatment efficiency and to reduce operation and maintenance costs of the existing nightsoil treatment plant. The existing nightsoil plant was not established by the nitrogen removal process, and was operated ineffectively with deterioration of treatment efficiency rate, and according to the demand of many operators, the expenses of operation and maintenance have become excessive. Modified plant has been changed through two steps. The first step, liquid decayed tank using closed oxidation ditch is operated to increase retention time only for nitrification. The second step, modified liquid decayed tank including anoxic tank is operated, it has an excellent nitrogen removal rate. In first step, when HRT was increased from 10 days to 13 days in liquid decayed tank including aeration tank using closed oxidation ditch, TN concentration of effluent appeared below 51 mg/l less than discharge limit, 60 mg/L. In second step, when anoxic tank and oxic tank were installed, HRT has been increased to 13 days and 26 days, respectively. Then average TN concentration of effluent was detected less than 13 mg/L for over one year. The simple process modified the existing two processes resulted in the reduction of costs for operation and maintenance in the personnel, chemical, and filter change sphere.

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Microbial community compositions in different functional zones of Carrousel oxidation ditch system for domestic wastewater treatment

AMB Express ◽

10.1186/s13568-017-0336-y ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 34

Author(s):

Dong Xu ◽

Sitong Liu ◽

Qian Chen ◽

Jinren Ni

Keyword(s):

Wastewater Treatment ◽

Microbial Community ◽

Domestic Wastewater ◽

Oxidation Ditch ◽

Domestic Wastewater Treatment ◽

Functional Zones ◽

Carrousel Oxidation Ditch

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Research on Intensive Nutrients Removal of the Low C/N Sewage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.2142 ◽

2012 ◽

Vol 550-553 ◽

pp. 2142-2145 ◽

Cited By ~ 1

Author(s):

Gao Shun Qiu ◽

Ling Feng Qiu ◽

Jian Zhang ◽

Yi Ming Chen

Keyword(s):

Sewage Treatment ◽

Effective Theory ◽

Utilization Rate ◽

Nutrients Removal ◽

Oxidation Ditch ◽

Nitrogen And Phosphorus ◽

Sewage Treatment Plants ◽

Urban Sewage ◽

Effective Removal ◽

Carrousel Oxidation Ditch

This paper was based on Carrousel oxidation ditch, which was common in the urban sewage treatment plants. With the effect of SND in the oxidation ditch, it was accomplished the effective removal for nitrogen and phosphorus of urban sewage with low C/N, while adopting point-aeration and brush flow, combining with the operation parameters adjustment. Under the condition of low dissolved oxygen (DO), the phenomenon of simultaneous nitrification and denitrification was obvious in macro and micro environments. And compared with the traditional process, this process increased the proportion of organics up to 51% in the ditch, which raised utilization rate of organics. Based on this to establish the kinetics model of TN removal, it could control the concentration of TN in the effluent effectively by adjusting HRT, MLSS and other parameters in the oxidation ditch, which would provide effective theory basis for optimization and adjustment of the process

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Research on the Influence Factors of the Biological Phosphorus Removal in Carrousel Oxidation Ditch Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.2169 ◽

2011 ◽

Vol 356-360 ◽

pp. 2169-2174

Author(s):

Zhou Fang Guo ◽

Hua Zhang ◽

Jin Hu ◽

Xiao Wu Huang ◽

Yang Luo

Keyword(s):

Phosphorus Removal ◽

Influence Factors ◽

Treatment Plant ◽

Phosphorus Release ◽

Engineering Practice ◽

Oxidation Ditch ◽

Biological Phosphorus Removal ◽

Important Indicator ◽

Anaerobic Zone ◽

Carrousel Oxidation Ditch

Abstract: The concentration of total phosphorus(P-tot) in effluent is an important indicator of the effect of wastewater treatment plant(WWTP), excessive discharge of phosphorus will result in the tender eutrophication of natural water and other ecological pollution problems. In this paper, Qilidian WWTP in Guilin for the study object, researched Carrousel oxidation ditch process of the plant DO, pH, nitrate, BOD5 and P-tot in influent, and P-tot in influent and in effluent of the final clarifier, systems analyzed the factors and reasons affecting phosphorus removal. The result of the research shows itself as follows: the dissolved oxygen (DO) in oxidation ditch anaerobic zone above 0.5mg/l and at the end of the aerobic zone up to 3.87mg/l are not suitable for phosphorus accumulating organisms (PAOs) to release phosphorus; in the influent, B0D5/P-tot<20, carbon source used for PAOs in the sewage is insufficient; the concentration of P-tot in the effluent is higher than that in the influent, there occurs an obvious phenomenon of phosphorus release in the final clarifier. In addition, the pH in oxidation ditch ranges from 6.82 to7.19 and the concentration of nitrate in anaerobic zone below 0.2mg/l are suitable for the phosphorus removal process. This research provide technical support for the similar oxidation ditch process of upgrading and transformation,and have a higher value in engineering practice.

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Evaluation of a novel oxidation ditch system for biological nitrogen and phosphorus removal from domestic sewage

Water Science & Technology ◽

10.2166/wst.2010.379 ◽

2010 ◽

Vol 62 (8) ◽

pp. 1745-1754 ◽

Cited By ~ 3

Author(s):

X. Chen ◽

T. Fujiwara ◽

K. Ohtoshi ◽

S. Inamori ◽

K. Nakamachi ◽

...

Keyword(s):

Nitrogen Removal ◽

Phosphorus Removal ◽

Domestic Sewage ◽

Control Technology ◽

Oxidation Ditch ◽

Anoxic Zone ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Do Control ◽

Biological Nitrogen

A novel oxidation ditch system using anaerobic tanks and innovative dual dissolved oxygen (DO) control technology is proposed for biological nitrogen and phosphorus removal from domestic sewage. A continuous bench-scale experiment running for more than 300 days was performed to evaluate the system. Monitoring and controlling the airflow and recirculation flow rate independently using DO values at two points along the ditch permitted maintenance of aerobic and anoxic zone ratios of around 0.30 and 0.50, respectively. The ability to optimize aerobic and anoxic zone ratios using the dual DO control technology meant that a total nitrogen removal efficiency of 83.2–92.9% could be maintained. This remarkable nitrogen removal performance minimized the nitrate recycle to anaerobic tanks inhibiting the phosphorus release. Hence, the total phosphorus removal efficiency was also improved and ranged within 72.6–88.0%. These results demonstrated that stabilization of the aerobic and anoxic zone ratio by dual DO control technology not only resulted in a marked improvement of nitrogen removal, but it also enhanced phosphorus removal.

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