Method for extraction of humic acid in high-concentration divalent-ion leachate MBR + NF concentrated liquid

An extraction method, humic acid technology, applied in the direction of fertilizer mixture, organic chemistry, fertilization equipment, etc., can solve the problems of complex maintenance and management, high operating costs, and membrane pollution of membrane systems, so as to achieve the unity of social and economic benefits and solve pollution Effects of controlling problems and reducing operating costs

Inactive Publication Date: 2016-06-22
福建百川环境技术股份有限公司 +2
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Problems solved by technology

Invention patents "Method for Reusing Leachate from Municipal Solid Waste Landfill" and "Extraction Method of Humic Acid" disclose the resource utilization method of leachate stock solution of municipal solid waste landfill and leachate MBR+NF membrane intercepted liquid. Although the former Organic liquid fertilizers with high solid content of organic matter (humic acid) can be obtained, but there are disadvantages such as poor separation effect of organic matter (humic acid) and inorganic salts in the submerged combustion evaporation unit, large energy consumption, high operating costs, and complicated maintenance and management; Compared with the former, although the separation effect of humic acid and inorganic salts is improved, and the energy consumption is greatly reduced, the latter is used for the mixed leachate of sanitary landfills and waste incineration plants with high divalent salt content or the leachate of separate waste incineration power plants. The humic acid in the filtrate MBR+NF membrane retentate is separated and recovered. During high-fold separation and concentration, calcium, magnesium and sulfate radicals are prone to supersaturated precipitation, which leads to serious membrane fouling in the membrane system and affects the operation stability of the system. even destroy the membrane system

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  • Method for extraction of humic acid in high-concentration divalent-ion leachate MBR + NF concentrated liquid

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Embodiment 1

[0016] Technical parameters of humic acid extraction method in the mixed leachate of municipal solid waste sanitary landfill and waste incineration power plant or separate leachate MBR+NF membrane retentate of waste incineration power plant according to the present invention:

[0017] 1. Water quality conditions of leachate MBR+NF membrane retentate

[0018] pH6.0~7.5

[0019] COD1000~4500mg / L

[0020] Conductivity 10~25ms / cm

[0021] Ca 2+ 300~1500mg / L

[0022] Mg 2+ 200~1000mg / L

[0023] SO 4 2- 600~3000mg / L

[0024] 2. Primary ultrafiltration system

[0025] Working pressure 0.5~1.8Mpa

[0026] Concentration times 5~12 times

[0027] Molecular weight cut off 1000~2500Da

[0028] COD7000~13000mg / L

[0029] 3. Secondary ultrafiltration system

[0030] Working pressure 0.5~1.8MPa

[0031] Concentration times 5~15 times

[0032] Molecular weight cut off 1000~2500Da

[0033] Humic acid≥30g / L

[0034] 4. Nanofiltration system

[0035] Working pressure 0.4~2Mpa ...

Embodiment 2

[0044] The first phase project of the sanitary landfill started operation in 1995, the second phase project was completed and put into use in 2012, and the first phase project of the waste incineration power plant started operation in 2008. The daily leachate produced by the sanitary landfill and waste incineration power plant is respectively 1200 tons and 300 tons, the total leachate water volume is 1500 tons / day. The leachate produced by sanitary landfills and waste incineration power plants is mixed in the regulating tank, and the water quality after homogenization and equalization is as follows: pH is 7~8.5, COD is 6000~12000mg / L, BOD is 2000~6000mg / L, conductivity The rate is 10~18ms / cm, and the color is gray-black. The leachate main treatment system adopts MBR+NF process, and the effluent reaches the discharge standard stably. The water quality of the leachate MBR+NF membrane retentate is: pH 6.5~7.2, COD 1000~3000mg / L, humic acid concentration (calculated as COD) about...

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Abstract

The present invention discloses a method for extraction of humic acid, namely a method for two-stage ultrafiltration extraction of humic acid in a urban domestic waste sanitary landfill site and waste incineration power plant mixed leachate or a separate waste incineration power plant leachate MBR + NF membrane interception liquid, and the extraction method is advanced, practical, economic, simple in process and equipment, small in land occupation, free of secondary pollution, reliable and simple in operation, and suitable for extraction of humic acid in leachate MBR + NF membrane interception liquids with high salt content especially high divalent salt ion concentration.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and particularly relates to separating humic acid from the mixed leachate of municipal solid waste sanitary landfills and waste incineration power plants or the leachate MBR+NF membrane intercepted liquid of separate waste incineration power plants and concentrating them into humic acid-containing Extraction method of water-soluble fertilizer. Background technique [0002] Leachate is a kind of high-concentration organic wastewater with high pollution intensity and extremely difficult to treat. It is one of the main secondary pollutions of garbage sanitary landfills and waste incineration power plants. At present, the mainstream process of leachate treatment is mainly MBR+NF+RO, of which RO is used as a process to ensure that the treatment reaches the standard and to further remove the salt in the NF effluent to meet the water quality requirements for reuse. The main process of the leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H99/00C07G99/00C05G1/00
Inventor 许玉东方艺民林智华黄思恩林燕评
Owner 福建百川环境技术股份有限公司
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