Treatment method for improving water yield of domestic waste incineration plant leachate

Abstract

The invention provides a treatment method for improving the water yield of domestic waste incineration plant leachate. The treatment method has an obvious treatment effect on high-CODcr, high-NH3-N and high-salt domestic waste incineration plant leachate, and can greatly improve the quality of outlet water; the pollution resistance of an ST membrane module is greatly more than that of common spiral-wound reverse osmosis, and the ST membrane module can receive produced water from an ultrafiltration system without pretreatment; the water concentration of a reverse osmosis process concentrate islower than that of ultrafiltration process produced water, so a concentrate generated in subsequent spiral-wound reverse osmosis can be received to network tube type reverse osmosis treatment withoutaffecting the water yield of the network tube type reverse osmosis treatment; the water yield of the spiral-wound reverse osmosis and network tube type reverse osmosis technology reaches 80% and evenmore; the index Cl<-> and TDS having special requirements also can meet incineration plant recirculated cooling water reuse standards; and compared with traditional nanofiltration treatment and spiral-wound reverse osmosis treatment tandem technology, the method increases the water yield to 80% or below 60%.

Description

technical field [0001] The invention relates to a leachate treatment method, in particular to a treatment method for improving the leachate output of domestic waste incineration plants. Background technique [0002] Landfill leachate is the product of primary waste storage, and incineration plant leachate mainly comes from the liquid produced by the waste itself holding water and waste decomposition. Since waste in China is not collected and treated in a classified manner, and is greatly affected by regions and seasons, the leachate water quality components of waste incineration plants are complex, and the water quality and water volume fluctuate greatly. High concentration of pollutants. According to the current statistics of incineration plant leachate water quality data, the concentration of CODcr is 30000-60000mg / L, the concentration of BOD is 20000-40000mg / L, and the concentration of ammonia nitrogen is 1500-2500mg / L. In addition, there are a large number of other meta...

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Problems solved by technology

[0004] Since the incineration plant requires that the effluent after leachate treatment meet the supplementary water standard of the open circulating cooling water system in "Urban Sewage Recycling-Industrial Water Quality" (GB / T19923-2005), the leachate can only be removed by the nanofiltration membrane unit. Ions, the reverse osmosis membrane can remove both divalent ions and monovalent ions. When the nanofiltration process and the reverse osmosis process are operated in series, the conventional indicators such as COD, ammonia nitrogen, total nitrogen, etc. can meet the effluent requirements, but for indicators Chloride ions and total dissolved solids often fail to meet the effluent standards, resulting in final product water that cannot meet the cooling tower reuse water standards of waste incineration plant incinerators

If these two indicators exceed the standard and enter the cooling tower system, it will cause corrosion to the cooling tower and there will be a risk of scaling

[0005] At the same time, due to the zero discharge requirements for incineration plants at this stage, sewage is not allowed to be discharged, and the existing treatment process adopts the method of membrane advanced treatment, which produces a large amount of concentrated liquid. Because the amount of sewage that the incineration plant can absorb is limited, Therefore, it is necessary to improve the process to reduce the amount of concentrated liquid to a level acceptable to the incineration plant

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