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Purification method of heavy metals in humic acid liquid fertilizer

A humic acid and heavy metal technology, which is applied in chemical instruments and methods, organic fertilizers, contaminated groundwater/leachate treatment, etc., can solve the problem of limited research and development of heavy metal purification methods and applicable technologies, lack of mature extraction technologies, and insufficient application. problem, to achieve the effect of stable system operation, simple process system operation and low cost

Active Publication Date: 2021-06-01
FUZHOU UNIV
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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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  • Purification method of heavy metals in humic acid liquid fertilizer

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Embodiment 1

[0019] The following is an example of the purification of heavy metals in the semi-finished product containing humic acid water-soluble fertilizer raw materials extracted by the MBR+NF concentrate of a domestic waste landfill and incineration power plant mixed leachate treatment plant, further illustrating the present invention.

[0020] The leachate of the domestic waste leachate treatment plant is the mixed leachate of landfill and incineration plant, which produces 1,500 tons of leachate per day. It adopts water quality balance as the pretreatment process, MBR as the main biochemical treatment process, and NF as the advanced treatment process flow. The treatment plant produces about 300 tons of MBR+NF concentrate per day, and can extract about 7.5 tons of humic acid-containing water-soluble fertilizer raw materials per day. The humic acid liquid fertilizer raw material has a humic acid content of 41g / L, of which fulvic acid is 34.6g / L, and the pH value is 7.1. The types wi...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F11/00C02F11/127C05F11/02C02F101/20C02F103/06
CPCC02F3/12C02F11/00C02F11/127C02F2101/20C02F2103/06C05F11/02Y02W10/10
Inventor 许玉东林将
Owner FUZHOU UNIV
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