Recycling method of municipal solid waste landfill leachate

A technology of domestic waste and leachate, applied in the fields of application, biological organic part treatment, organic fertilizer, etc., can solve the problems of poor selectivity, high cost, and affecting the normal operation of the membrane process

Inactive Publication Date: 2015-02-11
蒋寿悟
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  • Abstract
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Problems solved by technology

Because reverse osmosis and nanofiltration generally have a high rejection rate for each component in the concentrate, including organic matter and inorganic salts, and their selectivity is poor, especially reverse osmosis, which almost indiscriminately intercepts all of them. Therefore, the concentrate The composition is complex and the concentration is high. At present, its treatment methods mainly include recharge, i

Method used

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Embodiment Construction

[0014] The leachate recycling process of the present invention will be further described below.

[0015] Most of the organic matter contained in the leachate decomposed by the anaerobic bioreactor or the landfill that has entered the methanogenic stage is relatively stable. This type of leachate is lifted by the pump into the sand filter tank to remove sludge and other particulate matter with a particle size greater than 1 to 10 μm to ensure the good operation of the subsequent ultrafiltration system. The effluent is then pumped into the first-stage ultrafiltration system, and the leachate is divided into two parts under the pressure (operating pressure difference: 0.3-0.5Mpa): one part is the first-class concentrated solution (concentration ratio: 5-10 times) intercepted by the membrane, It is rich in refractory biodegradable organic matter mainly composed of humic acid, and the concentration is very high, and the total dissolved residue (TDS) mainly composed of inorganic sal...

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Abstract

The invention discloses a recycling method of municipal solid waste landfill leachate. The invention provides a recycling technology for separating humic acid from leachate and then concentrating into an organic liquid fertilizer. According to the technology, the treatability of the leachate can be improved or the leachate can be treated to be up to standard, and the problems and defects during treatment of concentrated liquor in the reverse osmosis and nano-filtration technology can be overcome. When a secondary ultrafiltration system treats primary concentrated liquor, less hydrochloric acid is added to reduce the concentration of calcium carbonate in the primary concentrated liquor and maintain the pH value being more than 7 so as to prevent the blocking problem of calcium carbonate. The recycling method has the characteristics that the recycling technology is provided from another view aiming to the most important problem that the indices of organic matters in the treated effluent water difficultly reach the standard because of high-concentration humic acid in the leachate, and the up-to-standard treatment of the leachate can be also considered.

Description

technical field [0001] The invention specifically relates to a method for reusing leachate from domestic waste landfills. The invention belongs to the technical field of garbage treatment, in particular to a recycling process for extracting humic acid from leachate of domestic garbage landfill and concentrating it into organic liquid fertilizer. Background technique [0002] Sanitary landfill has always been the main way of domestic waste disposal because of its low cost and reliable technology. In the daily operation and management of landfills, it is still a difficult problem to deal with leachate up to the standard, and it has become the main secondary pollution source of urban domestic waste landfills. . The essential reason for the difficult treatment of leachate is that the leachate contains high concentrations of refractory organic matter-humic acid and ammonia nitrogen. The former is actually more difficult to solve, because many studies and engineering practices ha...

Claims

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Application Information

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IPC IPC(8): C05F7/00
CPCC05F7/00Y02A40/20Y02E50/30Y02W30/40
Inventor 蒋寿悟
Owner 蒋寿悟
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