Process for UASB (Upflow Anaerobic Sludge Blanket) treatment on landfill leachate

Abstract

The invention discloses a process for UASB (Upflow Anaerobic Sludge Blanket) treatment on landfill leachate. The process specifically comprises the following steps: collecting landfill leachate generated in a landfill area by using a collection pipeline, separating solid impurities by using grids, feeding into a leachate adjusting pond, enabling an adjusting tank effluent to flow into a hydrolysisacidification pool, and feeding a hydrolysis acidification pool effluent into a screen net pond for treatment; lifting a screen net pond effluent into a UASB anaerobic reactor by using a pump, carrying out anaerobic treatment on the leachate by using the UASB anaerobic reactor, further feeding into a two-stage A / O (Anareobic-Areobic) biochemical reaction pond, lifting the leachate after biochemical treatment into an ultrafiltration system, a nanofiltration system and a reverse osmosis membrane system by using a lifting pump, carrying out treatment, and recycling or discharging after emissionstandards are met. Due to adoption of a heating system in the UASB anaerobic reactor, automatic heating can be carried out in the anaerobic reaction process, a blending tank does not need to be heated, and thus the cost can be reduced.

Description

technical field [0001] The invention belongs to the field of landfill leachate treatment and relates to a process suitable for UASB treatment of landfill leachate. Background technique [0002] Municipal solid waste sanitary landfill is the main way of final disposal of domestic waste, and leachate treatment facilities are one of the main indicators for the harmless treatment of domestic waste. Whether the leachate meets the standard is the focus of assessment. Domestic waste leachate generally has the characteristics of high organic and high ammonia nitrogen concentration, high chroma, high conductivity, high salt content, imbalance of carbon and nitrogen ratio, difficult biodegradation, great pollution hazards, etc., and is difficult to treat. [0003] As the landfill time increases, the leachate will age, the concentration of COD and BOD in the leachate will decrease, the content of ammonia nitrogen will increase, the ratio of carbon and nitrogen will be out of balance, a...

AI Technical Summary

Problems solved by technology

Domestic waste leachate generally has the characteristics of high organic and high ammonia nitrogen concentration, high chroma, high conductivity, high salt content, imbalanced carbon and nitrogen ratio, difficult biodegradation, great pollution hazards, etc., and is difficult to treat

[0003] As the landfill time increases, the leachate will age, the concentration of COD and BOD in the leachate will decrease, the content of ammonia nitrogen will increase, the ratio of carbon and nitrogen will be out of balance, and the biodegradability will decrease, which makes the traditional biochemical treatment system unable to In operation, the methanation efficiency of leachate treated with UASB anaerobic reactor is greatly reduced, and a series of problems such as poor ammonia nitrogen removal effect occur. UASB anaerobic reactor + MBR + A / O tank + disk tube reverse osmosis membrane (DTRO) + disinfection process for leachate treatment requires water temperature adjustment in the dosing tank, which increases operating costs; and because UASB The quality index of the effluent water from the reactor is still high and cannot directly enter the MBR system. The influent water of the membrane bioreactor (MBR system) should meet the limit values ​​such as COD less than 500mg / l and ammonia nitrogen less than 50mg / l. Reduce the service life of the MBR system. This process is difficult to treat the ammonia nitrogen in the leachate of the landfill after five years. High load, prone to membrane fouling and increased operating costs

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