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A treatment method for leachate of hazardous waste landfill

A technology for hazardous waste and treatment methods, which is applied in the treatment of polluted groundwater/leachate, water/sewage treatment, water treatment parameter control, etc. It can solve the problems of separation and high energy consumption, and reduce the amount of acid and the amount of treatment. Small, the effect of reducing heat source consumption

Active Publication Date: 2021-06-22
HUIZHOU DONGJIANG VEOLIA ENVIRONMENTAL SERVICES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Evaporation technology has no restrictions on the soluble solids in the influent, but one cannot separate the volatile pollutants through the evaporation process alone, and other processes need to be added to cooperate with the separation; the other is high energy consumption

Method used

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  • A treatment method for leachate of hazardous waste landfill

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, but this does not limit the protection scope of the present invention.

[0032] The technical scheme adopted in the present invention is: a kind of processing method of leachate of hazardous waste landfill, comprises the following steps:

[0033] (1) Use evaporation and concentration process: add acidic substances to the hazardous waste leachate, control the pH value during the evaporation process to 4-5; use vacuum distillation to reduce pressure, control the evaporation temperature between 60-70 ° C, distillate Reuse or discharge after treatment;

[0034] (2) Cooling and crystallizing the concentrated solution produced in the distillation process, followed by crystal separation;

[0035] (3) Carry out coagulation and flocculation to the liquid separated in step (2), then remo...

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Abstract

The invention discloses a treatment method for the leachate of a hazardous waste landfill, which comprises the following steps: (1) using an evaporation concentration process: adding acidic substances to the leachate of the hazardous waste, and controlling the pH value to 4-5 during the evaporation process; Use vacuum distillation to reduce pressure, control the evaporation temperature between 60-70°C, and reuse or discharge the distillate after treatment; (2) Cool and crystallize the concentrated liquid generated during the distillation process, and then carry out crystal separation; (3) Coagulation and flocculation are carried out to the liquid separated in step (2), then the flocs are removed by the air flotation separation process, and the scum of the separation gained is sent to the hazardous waste incinerator for incineration; (4) to the step ( 2) The solid separated in the process is sent to the hazardous waste landfill for landfill. The treatment method of the present invention can effectively and properly reduce and harmlessly treat the leachate of the hazardous waste landfill to the greatest extent, without generating secondary pollutants and causing no load impact on subsequent treatment.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment, in particular to a method for treating leachate from a hazardous waste landfill. Background technique [0002] Hazardous waste landfill leachate is a waste liquid that is very difficult to treat. Its main water quality features are: complex composition; high content of soluble solids, ammonia nitrogen, hardness, and COD; compared with domestic landfill leachate, ammonia nitrogen , COD is relatively low and soluble solids are relatively high; the water quality changes greatly in wet and dry seasons; The relative concentration of pollutants will change accordingly, and the total amount of pollutants will show an upward trend. [0003] Due to the complexity and changeability of leachate water quality in hazardous waste landfills, the industry still lacks a complete treatment process for this type of wastewater. More is to choose according to the water quality characteristics of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F9/14C02F103/06C02F101/30C02F101/16
CPCC02F1/048C02F1/24C02F1/52C02F1/66C02F3/30C02F9/00C02F2001/5218C02F2101/16C02F2101/30C02F2103/06C02F2209/02C02F2209/06C02F2301/046C02F2301/063
Inventor 高勇李东叶志成谢晓明王志波胡正权
Owner HUIZHOU DONGJIANG VEOLIA ENVIRONMENTAL SERVICES CO LTD
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