Resource process for percolation liquid of city life garbage landfill

Abstract

The technological process of utilizing percolation liquid from domestic garbage landfill belongs to the field of garbage treating technology. The present invention aims at raising the percolation liquid treating level to reach the exhaust standard. The technological process of utilizing percolation liquid from domestic garbage landfill includes the following steps: 1) pumping the percolation liquid to the first stage of ultrafiltering system and treating in pressure difference of 0.3-0.5 MPa, 5-10 times concentration and membrane separation to obtain the first stage of concentrated liquid; 2) pumping into the second stage of ultrafiltering system and treating in pressure difference of 1.0-1.5 MPa, 4-5 times concentration and membrane separation to obtain the second stage of concentrated liquid; and 3) treating in immersing, burning and evaporating system at burning temperature over 750 deg.c, immersing depth 0.3-0.6 m and 5-10 times concentration to obtain liquid organic fertilizer.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, in particular to a recycling process for extracting humic acid from leachate of urban domestic garbage landfill and concentrating it into organic liquid fertilizer. Background technique [0002] Sanitary landfill has always been the main way of municipal solid 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 method of municipal solid waste landfills. source of pollution. 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 have shown that as long as the reactor is selected reasonably or the process pa...

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.

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