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
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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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