New high-nitrogen organic sewage treatment biochemical denitrification process

Abstract

The invention relates to a new high-nitrogen organic sewage treatment biochemical denitrification process. The process mainly comprises the following technical steps of: 1, feeding raw sewage which accords with conditions into an upflow anaerobic sludge blanket (UASB); and simultaneously feeding reflow mixed solution of a subsequent oxidation nitration tank (O1) and a part of thick solution of a membrane bioreactor (MBR) ultra-filtration membrane separation device into the UASB; 2, simultaneously feeding effluent of the UASB, a part of thick solution of the MBR ultra-filtration membrane separation device and air into the oxidation nitration tank (O1); 3, feeding the effluent of the O1 tank into a denitrification tank (a tank A) of anoxic zone/aerobic zone A/O(2), simultaneously feeding the remaining sludge of the UASB and replenishing carbon, forming an anoxic condition at the tank A to perform denitrification, replenishing the part of thick solution of the MBR ultra-filtration membrane separation device and supplying air (oxygen) into the O(2) tank to further perform oxidation nitration reaction respectively, and removing chemical oxygen demand (COD), biochemical oxygen demand after 5 days (BOD5), total nitrogen (TN) and NH3-N; and 4, feeding the effluent of the A/O (2) into the MBR ultra-filtration membrane separation device, intercepting the active sludge and macromolecularCOD and enriching in the thick solution; feeding the thick solution into the UASB, the O1 tank and the A/O (2) tank respectively; performing sludge dehydration treatment on the remaining thick solution; and removing the COD and the BOD5. The total nitrogen removal rate of the technology is improved by over 50 percent.

Description

technical field [0001] The invention belongs to the field of domestic garbage leachate and similar waste water treatment, and in particular relates to a biochemical denitrification process technology for high-nitrogen organic sewage treatment. Background technique [0002] Landfill leachate is a kind of high-nitrogen organic complex sewage. In recent years, new technologies for landfill leachate treatment mainly include membrane biology (MBR), disk reverse osmosis (DTRO), nanofiltration (NF), reverse osmosis (RO), electric Chemistry, chemical redox, evaporation-ion exchange-deammonization, etc., the application of these new process technologies can make the landfill leachate treatment meet the discharge requirements of (GB16889-2008) "Pollution Control Standards for Domestic Waste Landfill Sites". [0003] In order to reduce the cost of sewage treatment and reduce the operating cost of the landfill, the current membrane bioreactor (MBR), dish reverse osmosis (DTRO), nanofilt...

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Problems solved by technology

[0003] In order to reduce the cost of sewage treatment and reduce the operating cost of the landfill, the current membrane bioreactor (MBR), dish reverse osmosis (DTRO), nanofiltration (NF), reverse osmosis (RO), electrochemical, chemical oxidation Reduction, evaporation-ion exchange-deammonization and other new processes have the disadvantages of being greatly affected by the change of pollutant concentration, the total removal rate of single treatment is not high, the volume of membrane concentrate is large and difficult to deal with, or the energy consumption is large and the treatment cost is high.

Cai Hui et al., "Exploring the Development Process of China's Landfill Leachate Treatment Technology", Environmental Sanitation Engineering, 2010, 4, 18, Volume 4, Issue 10-15. Clarified that the main process of China's landfill leachate treatment technology is membrane bioreactor + membrane In theory, the effect of primary denitrification of the advanced treatment combination process is mainly related to the reflux rate of the primary nitrification liquid. In actual operation, due to the high reflux rate, the loss of dominant bacteria in the denitrification tank is large, resulting in denitrification efficiency that cannot achieve the desired effect; 20104-10 Jiangsu Jiuwu High-Tech Co., Ltd. "Urban Waste Landfill Leachate Treatment China's Local Technology has Obvious Advantages in Cost-Effectiveness" discloses the current main leachate treatment process: mesophilic anaerobic + membrane bioreactor (MBR) + NF/RO, and its defects are The medium temperature anaerobic + membrane bioreactor has a low carbon source utilization rate for raw water, and th

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