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Pretreatment technical method of landfill leachate nanofiltration concentrated liquor

A technology of landfill leachate and process method, which is applied in the field of pretreatment process of landfill leachate nanofiltration concentrate, can solve the problems of high operating costs, corrosion and scaling of evaporators, etc., achieve stable operation, simple equipment, and reduce equipment investment Effect

Inactive Publication Date: 2019-03-29
艾西姆(辽宁)环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process needs to solve the problem of corrosion and scaling of the evaporator, and the operating cost is relatively high

Method used

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  • Pretreatment technical method of landfill leachate nanofiltration concentrated liquor
  • Pretreatment technical method of landfill leachate nanofiltration concentrated liquor

Examples

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Effect test

Embodiment 1

[0040] A process method for pretreatment of landfill leachate nanofiltration concentrate, the schematic flow chart of which is shown in figure 2 , including the following steps:

[0041] Step 1: Coagulation Treatment

[0042] Add a coagulant to 5 tons of landfill leachate nanofiltration concentrate water A, add a coagulant, and fully stir to make the coagulant react with the COD in the landfill leachate nanofiltration concentrate, and perform coagulation treatment 1 to form a precipitate and obtain a precipitate The primary mixed liquid B of the substance; wherein, the coagulant is an iron salt; the coagulant is added in a wet method, and the mass concentration percentage of the coagulant solution is 30%, and the dosage is based on the landfill leachate sodium The COD in the filtered concentrated solution depends on the solid-to-liquid ratio, COD: coagulant solution = 1kg: 1L;

[0043] In this embodiment, the content of COD in the landfill leachate nanofiltration concentrat...

Embodiment 2

[0057] A process method for pretreatment of landfill leachate nanofiltration concentrate, comprising the following steps:

[0058] Step 1: Coagulation Treatment

[0059] Add a coagulant to 5 tons of landfill leachate nanofiltration concentrated liquid into the water, and add coagulant and fully stir, so that the coagulant reacts with the COD in the landfill leachate nanofiltration concentrated liquid to form a precipitate, and obtain a primary mixed solution of the precipitate; Wherein, the coagulant is an aluminum salt; the coagulant is added in a wet method, the mass concentration percentage of the coagulant solution is 35%, and the dosage is determined according to the COD in the landfill leachate nanofiltration concentrate , according to the solid-liquid ratio, COD: coagulant solution = 1kg: 0.8L;

[0060] In this embodiment, the content of COD in the landfill leachate nanofiltration concentrate is 5000mg / L, the mass concentration percentage of the coagulant is 35%, and t...

Embodiment 3

[0074] A process method for pretreatment of landfill leachate nanofiltration concentrate, comprising the following steps:

[0075] Step 1: Coagulation Treatment

[0076] Add a coagulant to 5 tons of landfill leachate nanofiltration concentrated liquid into the water, and add coagulant and fully stir, so that the coagulant reacts with the COD in the landfill leachate nanofiltration concentrated liquid to form a precipitate, and obtain a primary mixed solution of the precipitate; Wherein, the coagulant is iron salt; the coagulant is added in a wet method, and the mass concentration percentage of the coagulant solution is 35%, and the dosage is determined according to the COD in the landfill leachate nanofiltration concentrate, According to the solid-liquid ratio, COD: coagulant solution = 1kg: 1.2L;

[0077] In this embodiment, the COD content in the landfill leachate nanofiltration concentrate is 6000mg / L, the mass concentration percentage of the coagulant is 35%, and the dosa...

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Abstract

The invention discloses a pretreatment technical method of landfill leachate nanofiltration concentrated liquor, and belongs to the field of water treatment of the environment protection industry. Thepretreatment technical method comprises the steps that a coagulating agent is added into landfill leachate nanofiltration concentrated liquor inflow and fully stirred to generate precipitation, primary mixed liquor with the precipitation is filtered, alkali is added into obtained primary clear liquor and fully stirred, the pH value is regulated to 9-10, alkali is added to neutralize coagulating agent residue in the primary clear liquor, precipitation appears, and secondary mixed liquor with the precipitation is filtered to obtain secondary clear liquor, namely landfill leachate nanofiltrationconcentrated liquor outflow. By adopting the method to pretreat the landfill leachate nanofiltration concentrated liquor (the COD of the concentrated liquor is 4000-6000 mg / L), the COD removal rate of the obtained landfill leachate nanofiltration concentrated liquor outflow can reach 68% to 75%. By means of the method, equipment investment and operation costs are greatly reduced, meanwhile, technical processes are simple, operation is stable, concentrated water drainage or concentration and crystallizing problems are avoided, and the method has great technical and economical advantages.

Description

technical field [0001] The invention belongs to the field of water treatment in the environmental protection industry, and more specifically relates to a process method for pretreatment of landfill leachate nanofiltration concentrate. Background technique [0002] Garbage leachate is mainly secondary pollution produced by municipal solid waste after sanitary landfill. In the process of landfilling municipal solid waste, compaction and microbial decomposition are mainly used, but at the same time, pollutants in the waste are also dissolved in water, so that landfill leachate is gradually formed. The sources of pollutants in landfill leachate are mainly: ① soluble organic and inorganic matter contained in the waste itself; ② some soluble substances are produced after a series of actions and reactions in the waste. Landfill leachate is a high-concentration special organic wastewater, which has the characteristics of high COD concentration, large changes in water quality and qu...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/06
CPCC02F9/00C02F1/001C02F1/66C02F1/5245C02F2103/06C02F2301/08C02F2209/08C02F2209/06
Inventor 王惠丰史克威王富民倪德建
Owner 艾西姆(辽宁)环境技术有限公司