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Treatment method for realizing leachate pollutant zero-discharge and recycling

A treatment method and technology for pollutants, applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problems of air secondary pollution, non-implementation, secondary pollution, etc., and achieve volume reduction, The effect of low equipment cost and processing cost and simple process

Active Publication Date: 2013-12-04
李虹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The concentration of gaseous alkaline pollutants in the leachate is very high, and biological nitrification and denitrification can only remove part of it; it is difficult to oxidize it with various catalysts; therefore, if curing treatment is used, during or after curing, Volatile pollutants will cause secondary pollution to the air; the dissolution and separation of volatile pollutants will cause secondary pollution to surface water and groundwater, so this solidification treatment method that is prone to secondary pollution cannot be implemented

Method used

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  • Treatment method for realizing leachate pollutant zero-discharge and recycling
  • Treatment method for realizing leachate pollutant zero-discharge and recycling
  • Treatment method for realizing leachate pollutant zero-discharge and recycling

Examples

Experimental program
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Effect test

Embodiment 1

[0039] figure 2 It is the process flow chart of this embodiment, image 3 It is a schematic diagram of the device structure used in the implementation of this embodiment.

[0040] This example is for the treatment of landfill leachate containing low-boiling point gaseous alkaline pollutants.

[0041] The sensible heat exchange device 4 is used to preheat the leachate, and then the latent heat exchange device 3 is used to heat the leachate to generate steam. The process is:

[0042] The leachate pumped by the leachate supply device 8 is heated by the heating side of the sensible heat exchange device 4 and the evaporation side of the latent heat exchange device 3, and then enters the gas-liquid separation device 5 through the throttle valve 7;

[0043] The separated water vapor containing low-boiling point gaseous basic pollutants is output from the water vapor outlet 51 of the gas-liquid separation device 5, passes through the gas compressor 1 to generate superheated steam, ...

Embodiment 2

[0074] Normal pressure operation, acid absorption neutralizer solution is nitric acid aqueous solution, PH=0.2, total dissolved matter concentration 51%, relevant data and purification effect are as follows:

[0075]

[0076]

[0077] The purification effect meets the national standard GB1689-2008 special emission limit and agricultural recycling standard.

Embodiment 3

[0079] Normal pressure operation, the acidic absorption neutralizer solution is a high-boiling organic solvent containing nitric acid aqueous solution, PH=0.3, and the total dissolved matter concentration is 52%. The relevant data and purification effect are as follows:

[0080]

[0081] The purification effect meets the national standard GB1689-2008 special discharge limit and industrial reuse water standard.

[0082] The "total dissolved matter" described in the above-mentioned embodiments 2-3 refers to all dissolved matter in the acidic absorption neutralizing agent solution, including acidic absorption neutralizing agent and absorption of gaseous basic pollutants generated in superheated steam. Volatile soluble salts.

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Abstract

The invention discloses a treatment method for realizing leachate pollutant zero-discharge and recycling. The treatment method comprises the following steps of heating a garbage leachate, carrying out gas-liquid separation, heating the steam to obtain superheated steam, carrying out gas-liquid contact between the superheated steam and an acidic absorption and neutralization agent solution so that gaseous alkaline pollutants in the steam are absorbed and neutralized and the pollutants are transformed into difficultly-volatilizable salts, carrying out repeated circulation absorption of the gaseous pollutants in the steam by the acidic absorption and neutralization agent solution, evaporating water in the acidic absorption and neutralization agent solution so that a salt concentration of the solution is improved, discharging the acidic absorption and neutralization agent solution, and carrying out recycling. The pollutants in the superheated steam are absorbed by the acidic absorption and neutralization agent solution and then can be used for heating the garbage leachate, and after repeating circulation heating and separation, the garbage leachate having a certain concentration is discharged and recycled. The treatment method has simple processes, a low device cost and a low treatment cost, realizes efficient and deep treatment on the garbage leachate, and realizes zero-discharge and recycling of pollutes.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment method for garbage leachate. Background technique [0002] For landfill leachate with high concentration of pollutants, complex components, high toxicity or poor biodegradability, the concentration of pollutants in it is more than 100 times that of ordinary sewage, which is extremely difficult to treat, and a large amount of sludge and concentrated liquid will be produced after treatment. , has become a long-term industrial problem that is not easy to solve. [0003] The problems existing in the existing leachate treatment methods mainly include: [0004] Biological method: the equipment is large in size, and carbon sources need to be added, the removal is not complete, and a large amount of sludge is generated; [0005] Blow-off method: high energy consumption, high drug consumption, incomplete removal, easily affected by environmental conditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/16B01D53/78
Inventor 李虹
Owner 李虹
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