High-concentration landfill leachate membrane concentrated solution treatment process and application thereof

A landfill leachate, high-concentration technology, used in filtration treatment, polluted groundwater/leachate treatment, water/sewage treatment, etc., can solve problems such as high operating costs, difficult conditions to control, secondary pollution, etc. Filtration effect, low cost, and fouling mitigation effect

Active Publication Date: 2021-10-19
湖南天为环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent application with publication number CN105923850B discloses a landfill leachate membrane concentrate treatment process, which includes flocculation pretreatment, Fenton reaction, electrolytic treatment, and Fenton-like reaction multi-stage technical coupling to process the concentrate , the process of this treatment method is relatively complicated, the conditions are not easy to control, and it is easy to produce secondary pollution, and the concentration of the concentrated solution is not high. The experimental example shows that the COD of the membrane concentrated solution is only 4300~4500mg / L; Leachate Membrane Concentrate Treatment Method
The treatment method includes electrocatalytic oxidation, coagulation precipitation, ultrafiltration, and evaporation treatment, in which only the electrocatalytic oxidation step needs to adjust the pH, and a large amount of H 2 o 2 , Iron salt, the process is complicated and the operation cost is high. The concentration of organic pollutants in the concentrate treated by this process is 4000-10000mg / L in terms of CODcr, and the hardness is measured in CaCO 3 Calculated as more than 1000mg / L
In the existing industry, due to the long-term recharge of the membrane concentrate and the non-standard treatment of food waste in some areas (entering the landfill), the COD concentration and conductivity of the landfill leachate increase, which has a huge impact on the traditional biochemical process. Often This type of leachate is mostly treated by the full-membrane method. The resulting concentrated solution has a COD of more than 20,000 mg / L and an ammonia nitrogen of more than 3,000 mg / L. How to effectively treat this high-concentration landfill leachate membrane concentrate has become an industry challenge. problem

Method used

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  • High-concentration landfill leachate membrane concentrated solution treatment process and application thereof
  • High-concentration landfill leachate membrane concentrated solution treatment process and application thereof
  • High-concentration landfill leachate membrane concentrated solution treatment process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0162] A process for treating high-concentration landfill leachate membrane concentrate, the steps of which are as follows:

[0163] (1) Pretreatment: 1000kg of membrane concentrate produced by the leachate passing through the reverse osmosis membrane system, first add 2kg of sodium ferric oxalate and stir for 30 minutes, then add 150kg of lightly burned powder and fly ash (mass ratio of lightly burned powder to fly ash 1:1), continue stirring for 30 minutes;

[0164] (2) Pressure filtration: the concentrated liquid after stirring enters the pressure filtration system to obtain the filtrate and filter residue with a mass fraction of 80%, the filtrate enters the collection tank, and the filter residue is stored for later use;

[0165] (3) Evaporation: The filtrate enters the evaporation system from the collection tank for evaporation and concentration. After being concentrated 9 times, the evaporated mother liquor enters the solidification system, and the condensate returns to ...

experiment example 2

[0172] A process for treating high-concentration landfill leachate membrane concentrate, the steps of which are as follows:

[0173] (1) Pretreatment: 1000kg of membrane concentrate produced by the leachate passing through the reverse osmosis membrane system, first add 3kg of sodium ferric oxalate and polyaluminum chloride (the mass ratio of sodium ferric oxalate to polyaluminum chloride is 3:1) and stir for 30 minutes, Then add 150kg of lightly burned powder, fly ash, and lignosulfonic acid (mass ratio of lightly burned powder: fly ash: lignosulfonic acid is 1:1:0.2), and continue stirring for 50 minutes;

[0174] (2) Pressure filtration: The concentrated liquid after stirring enters the pressure filtration system to obtain the filtrate and filter residue with a mass fraction of 82%, the filtrate enters the collection tank, and the filter residue is stored for later use;

[0175] (3) Evaporation: The filtrate enters the evaporation system from the collection tank for evaporat...

experiment example 3

[0184] A process for treating high-concentration landfill leachate membrane concentrate, the steps of which are as follows:

[0185] (1) Pretreatment: 1000kg of membrane concentrate produced by the leachate through the reverse osmosis membrane system, first add 4kg of sodium diacetate and stir for 40min, then add 180kg of fly ash and slag (the mass ratio of fly ash: slag is 3:1 ), continue stirring for 60min;

[0186] (2) Pressure filtration: the concentrated liquid after stirring enters the pressure filtration system to obtain filtrate and filter residue with a mass fraction of 85%, the filtrate enters the collection tank, and the filter residue is stored for later use;

[0187] (3) Evaporation: The filtrate enters the evaporation system from the collection tank for evaporation and concentration. After 11 times of concentration, the evaporated mother liquor enters the solidification system, and the condensate returns to the membrane treatment system, and is discharged after t...

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Abstract

The invention discloses a high-concentration landfill leachate membrane concentrated solution treatment process and application thereof, and belongs to the field of wastewater treatment. The high-concentration landfill leachate membrane concentrated solution treatment process is characterized by comprising the following steps: pretreating the high-concentration landfill leachate membrane concentrated solution with pretreatment salt and a composite material, wherein the pretreatment salt is selected from ferric sodium oxalate or sodium diacetate; and the composite material is selected from the group consisting of light burning powder, sodium lignin sulfonate, fly ash, and slag. According to the process, efficient pretreatment is carried out before evaporation treatment, scaling of the evaporator is greatly relieved, and energy consumption of the evaporator is reduced; and in the curing process, active components in the filter residues and the evaporation mother liquor are utilized, a cured body meeting the landfill requirement is formed through activation, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a process for treating high-concentration landfill leachate membrane concentrate and its application. Background technique [0002] Landfill leachate has complex components and contains many toxic and harmful substances. If it is not treated in time, it will cause harm to the environment and human health. CJJ150-2010 "Technical Specifications for Domestic Leachate Treatment" established the landfill leachate treatment process route in 2011, adopting the combined route of "pretreatment + biological treatment + membrane treatment". The combined process of MBR membrane bioreactor, RO membrane and NF membrane is simple in operation, high in interception efficiency, and ideal in effluent effect. It is one of the mainstream treatment processes for landfill leachate in my country at present; , the most used is the "pretreatment + DTRO (disk tube reverse osmosis)" process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16C02F103/06
CPCC02F9/00C02F1/54C02F1/5236C02F1/281C02F1/28C02F5/02C02F1/001C02F1/042C02F2101/16C02F2103/06
Inventor 曹兴罗雅婧周甜蔡昕彤黄敏
Owner 湖南天为环保科技有限公司
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