Purification method of heavy metals in humic acid liquid fertilizer

Abstract

The invention belongs to the technical field of landfill leachate treatment, and in particular relates to a method for purifying heavy metals in humic acid liquid fertilizer raw materials. Firstly, the residual sludge from the leachate treatment system or sewage treatment plant is alkaline modified and centrifugally dehydrated, and then the modified dewatered sludge is put into the humic acid liquid fertilizer aeration purification tank, and the purified mixed liquid is separated from the solid and liquid. The clear liquid is the raw material of the purified humic acid liquid fertilizer. The method mainly adopts the alkaline modification of activated sludge to purify the heavy metals in the humic acid liquid fertilizer raw materials, so as to achieve the purpose of improving the quality of the produced humic acid-containing water-soluble fertilizer and broadening its use. The method of the invention is effective, economical, simple, wide in adaptability and stable in operation.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment, and in particular relates to a method for purifying heavy metals in humic acid liquid fertilizer raw materials. Background technique [0002] The MBR+NF process is a typical technical way to treat landfill leachate, which will produce a nanofiltration concentrate that accounts for 10-20% of the original liquid volume. Currently, the water-soluble fertilizer containing humic acid is extracted based on the combination of dense ultrafiltration and nanofiltration, and at the same time realizes the The method and technology of the harmless treatment of concentrated liquid has been applied in engineering, and is being recognized by the industry to become a mainstream process, so as to realize the sustainable treatment of landfill leachate. However, organic fertilizers generally contain higher concentrations of heavy metals than chemical fertilizers, which has become an important fac...

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Problems solved by technology

At the same time, due to the lack of mature extraction technology and high cost of humic acid from the fermentation liquid formed by microbial fermentation, although the produced humic acid-containing liquid fertilizer has excellent fertilizer efficiency, it has been mainly used in the past few decades. It is not common enough, resulting in limited research and development of relevant heavy metal purification methods and applicable technologies. Therefore, with the implementation of the country's vigorous promotion and application of organic fertilizer policies, more effective, economical and simple purification methods for heavy metals in humic acid-containing liquid fertilizers are urgently needed

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