Recycling method of municipal solid waste landfill leachate

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...

AI Technical Summary

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, incineration, solidification, etc. Among them, the cost of incineration and solidification is high, while the cost of recharge is relatively low, but it will lead to salt in the leachate of the landfill after recharge. Accumulation of ions, which will affect the normal operation of the membrane process

To sum up, there are certain problems and shortcomings when considering leachate simply from the perspective of treatment.