High-rate nitrogen removal and its behavior of granular sequence batch reactor under step-feed operational strategy

The present work deals with the upgrading of conventional Sequential Batch Reactor (SBR) technology for treating industrial wastewater. The aim is to obtain total nitrogen removal in a single SBR by implementing short aeration cycles. The operational strategy of conventional SBR consisting of a sequence of five phases (filling, aeration, stirring, settling and withdrawing) is simplified into a four phases sequence (filling, short cycled aeration, settling and withdrawing). This operational sequence has been proven to be adequate for total nitrogen removal from high strength wastewater containing nitrogen (up to 700 mg TKN/L) and organic matter (up to 2,000 mg COD/L). Short-cycled aeration allowed for a more efficient use of the oxygen supply for nitrification and the organic carbon content present in the wastewater for denitrification. The results here reported show that initially the tested technology is feasible and can report significant cuts in operation and maintenance when compared with conventional SBR processes. Total nitrogen removal up to 79% was attained treating the effluent of an UASB process designed for treating the wastewater of a potato starch factory. Total nitrogen removal capacities ranging between 0.2 and 0.65 kg of nitrogen per cubic metre per day are reported.

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N2O production during nitrogen removal in sequence batch reactor wastewater treatment systems

2010 International Conference on Mechanic Automation and Control Engineering ◽

10.1109/mace.2010.5536726 ◽

2010 ◽

Author(s):

Zhaoxiang Zhang ◽

Yayi Wang ◽

Junjun Geng ◽

Wei Zhao

Keyword(s):

Wastewater Treatment ◽

Nitrogen Removal ◽

Batch Reactor ◽

Sequence Batch Reactor ◽

Wastewater Treatment Systems

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Advanced nitrogen removal from landfill leachate using real-time controlled three-stage sequence batch reactor (SBR) system

Bioresource Technology ◽

10.1016/j.biortech.2014.02.058 ◽

2014 ◽

Vol 159 ◽

pp. 258-265 ◽

Cited By ~ 37

Author(s):

Lei Miao ◽

Kai Wang ◽

Shuying Wang ◽

Rulong Zhu ◽

Baikun Li ◽

...

Keyword(s):

Real Time ◽

Nitrogen Removal ◽

Landfill Leachate ◽

Batch Reactor ◽

Sequence Batch Reactor ◽

Advanced Nitrogen Removal

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A Study on the Improvement of Nitrogen & Phosphorus Removal of a Sequence Batch Reactor with Internal Circulation and Multi-Step Addition

Journal of Korean Society of Environmental Engineers ◽

10.4491/ksee.2020.42.5.280 ◽

2020 ◽

Vol 42 (5) ◽

pp. 280-288

Author(s):

Pul-Eip Lee ◽

Duckhui Lee ◽

Bum-Su Kim ◽

Yuhoon Hwang ◽

Tae-Jin Lee

Keyword(s):

Nitrogen Removal ◽

Removal Rate ◽

Batch Reactor ◽

Nitrogen Concentration ◽

Oxygen Control ◽

Internal Circulation ◽

Carbon Nitrogen Ratio ◽

Nitrogen Ratio ◽

Sequence Batch Reactor ◽

Raw Wastewater

Objectives:The purpose of this study is to increase the denitrification and phosphorus removals by the oxygen control of the anaerobic or anoxic period using the circulation of the supernants through the settled sludge and multi-step addition of raw wastewater during the operation of the internal circulation sequence batch reactor (ICSBR).Methods:The internal circulation pipe at the bottom of SBR is installed to circulate the supernatant into the settled sludge layer to create anoxic condition of non-aeration period instead of a stirrer in a SBR. And it is attempted to develope the SBR that properly uses the organic materials of the raw wastewater as a carbon source by the feeding the raw wastewater at a suitable time of the reaction period.Results and Discussion:Dissolved oxygen (DO) concentration of the reactor decreases more rapidly with an internal circulation to which the uniform pressure division method is applied, increasing the efficiency of about 40%. As the multi-step addition of raw wastewater proceeds, the nitrogen concentration of effluent is lowered and the C/N (Carbon/Nitrogen) ratio is higher, the nitrogen removal rate is higher.Conclusions:Circulating the supernatant to the bottom through settle sludge was effected to properly control the dissolved oxygen in the reaction tank, thereby improving the denitrification efficiency by about 68%. Even the higher the C/N ratio at the step addition can be expected the higher the nitrogen removal, it is noteworthy that the optimum feeding ratio of the multi-step addition may be different depending on the C/N ratio.

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