Method for treating domestic waste leachate tail water in adsorption-coagulation way

Abstract

The invention provides a method for treating domestic waste leachate tail water in an adsorption-coagulation way, belonging to the technical field of environment waste treatment. The method comprises the following steps of, firstly, biological treatment of domestic waste leachate; secondly, adsorption and decoloration treatment; thirdly, chemical coagulation treatment and the like. In the invention, by replacing granular activated carbon with powdery activated carbon and replacing a static filter process with quick stirring, under the synergism of adsorption and coagulation, the COD (ChemicalOxygen Demand) removal rate reach above 85 percent, the chroma is 40 times, and the effluent quality is good and reaches the national emission standard, thereby preventing the problems of blockage ofthe powdery activated carbon to a filter tank, floating residues in water and the like. The method is suitable for deep treatment of various domestic waste leachate tail waters.

Description

technical field [0001] The invention relates to the technical field of environmental waste treatment, in particular to an advanced treatment method for tail water of domestic garbage leachate. Background technique [0002] Domestic waste leachate has complex components, high organic content, deep color and odor, high chemical oxygen demand (COD), and biological oxygen demand (BOD 5 ) is relatively low and has poor bioavailability. At present, most of the domestic waste leachate treatment in my country still adopts the traditional process of pretreatment + aerobic biological treatment. Due to the limited ability of conventional biological treatment to treat toxic, harmful and refractory biodegradable organic matter, the effluent after general biological treatment (also known as domestic waste) The content of organic matter in leachate tail water) is still high (COD is as high as hundreds of mg / L), while BOD 5 / COD is very low, and the ratio of C:N:P is seriously out of balan...

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Problems solved by technology

Among them, although the treatment effect of membrane separation technology is better, its one-time investment cost is high, the technical difficulty is relatively large, the cleaning of the membrane system is difficult, the water demand for backwashing is large, the membrane life is short, and there are also problems with the treatment of concentrates. Problem: Chemical oxidation can oxidize and remove organic matter in wastewater, but due to the strong antioxidant capacity of organic matter such as refractory humus in tail water, common chemical oxidants have slow oxidation rates, low utilization efficiency, and difficulty in completely mineralizing pollutants, etc. Defects lead to limited removal of organic matter, and the quality of effluent water is difficult to meet the discharge standard; At present, the adsorption and filtration method of removing refractory organic matter in wastewater by granular activated carbon (GAC) is widely used, but this method has a relatively lagging effect on the removal of organic matter, which is very difficult. It is difficult to achieve effective removal of organic matter, and there is also the problem of regular replacement of GAC, and the operability is poor; if powdered activated carbon is used instead of granular activated carbon, it will easily cause blockage of the filter in the adsorption filtration process, and powdered activated carbon also exists in water. There is a floating phenomenon, and it cannot be efficiently contacted with the organic matter in the wastewater, resulting in low removal efficiency