Zero-emission system for treating landfill leachate

Abstract

The invention discloses a zero-emission system for treating landfill leachate. The zero-emission system comprises a primary sedimentation tank, an adjusting tank, a hydrolytic acidification tank, a UASB (Upflow Anaerobic Sludge Blanket) reactor, an A / O-MBR (Membrane Bioreactor) system, an MBR membrane water production tank, a nano-filtration (NF) device, a nano-filtration freshwater water production tank, an electrodialysis system, an electrodialysis freshwater tank and an RO (Reverse Osmosis) device, which are connected in sequence, wherein an output end of the RO device is connected with a reverse osmosis concentrated water tank and a reverse osmosis freshwater tank. A treatment technology with the primary sedimentation tank, the adjusting tank, the hydrolytic acidification tank, an efficient anaerobic reactor, the A / O-MBR system, an NF system, electrodialysis and an RO system is adopted, and organic matters and ammonia nitrogen in the leachate can be effectively degraded; a frequentreverse system of the electrodialysis is applied and a high desalting rate can be realized; a concentrated water reduction system combining chemical softening and a membrane is adopted to reduce therigidity of a concentrated solution and improve the total recovery rate; the whole technology has the advantages of low treatment cost, less investment, stable operation and high operability, and zeroemission of landfill leachate treatment is realized.

Description

technical field [0001] The invention relates to a zero discharge system for landfill leachate treatment. Background technique [0002] At present, landfill leachate has the characteristics of high organic matter concentration, high ammonia nitrogen, and high salt content, so its effective treatment has always been a difficulty in domestic and foreign water treatment circles. At present, the mainstream technology of landfill leachate treatment in China is the process of "pretreatment + biochemical treatment + advanced treatment", which mainly involves the process of carbon oxidation (removal of organic matter) and nitrification in the aerobic section, and then the nitrification mixture is refluxed to the deficient. The denitrification reaction is carried out in the oxygen section to complete the nitrification and denitrification denitrification process; and the MBR membrane bioreactor is used for further treatment. The use of membrane separation technology makes the treatment...

AI Technical Summary

Problems solved by technology

[0003] However, the salinity in the MBR effluent does not meet the industrial water reuse standard, so advanced treatment of the effluent is required

The common advanced treatment process is nanofiltration or reverse osmosis technology, but the recovery rate of purified water by the combined technology of nanofiltration and reverse osmosis is low, generally the recovery rate is less than 75%, resulting in a large amount of concentrated water and difficult consumption; and the use of nanofiltration / reverse osmosis The reverse osmosis process only has the effect of concentrating inorganic salts, and the salts in the reaction system are continuously enriched and cannot be effectively removed

Another advanced treatment technology adopts DTRO / STRO process, which can improve the recovery rate, but this technology requires pressurization during the treatment process, which increases the system design cost

Images