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...

AI Technical Summary

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 the denitrification tank has a large loss of dominant denitrifying bacteria; the publication number is CN101811796A invention patent application "a treatment method for landfill leachate", the method includes: adjusting pool, flocculation sedimentation tank, anaerobic reactor, membrane bioreactor, nanofiltration and reverse osmosis, wherein the anaerobic reactor is UASB or UBF (upflow sludge bed-filter), and the membrane bioreactor includes anoxic zone (A) and aerobic zone (O), its defect is that the carbon source utilization rate of anaerobic reactor, membrane bioreactor configuration to raw water is low, and the dominant bacterium loss of denitrification tank is big; Publication number is CN1018050964 invention patent application, "Two-stage UASB+A / O+SBR process for deep denitrification of landfill leachate in different periods", discloses integrated water tank I, two UASB reactors (first-stage UASB II and second-stage UASBIII), A / Composed of O reactor IV, secondary settling tank V, and SBR reactor VI, its disadvantages are that the two-stage UASB+A / O has a low utilization rate of raw water carbon source, and the loss of dominant bacteria in the denitrification tank is large

[0004] The reasons for the problems and defects in the above-mentioned background technology are that ① anaerobic reaction removes a large amount of COD, which may lead to a low carbon-nitrogen ratio in the denitrification tank; ② A / O tank denitrification dominant bacteria are not retained

The former problem can be improved by using a transcendence tube, but the latter problem needs to be improved by adding an intermediate sedimentation tank and a reflux device between A and O

Images