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Extraction method of humic acid

An extraction method, humic acid technology, applied in the direction of organic fertilizers, etc., can solve problems such as poor effect, high cost, accumulation system, etc., and achieve the effect of solving pollution control problems, low operating costs, and high-efficiency separation

Active Publication Date: 2013-12-11
FUZHOU UNIV
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  • Claims
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Problems solved by technology

However, this process also inevitably produces a certain volume of nanofiltration membrane retentate. At present, the common methods for treating this retentate include refilling, chemical oxidation, concentrated incineration, solidification, etc., because the organic matter in the retentate is mainly difficult to biodegrade. humic acid, the effect of backfilling to the landfill is not good, and the concentration of salt ions in the retained liquid may be higher than that of the leachate raw liquid, which may cause the accumulation of salt ions and make the system difficult to operate normally, while chemical oxidation, concentrated incineration, Expensive for curing etc.
Therefore, the invention patent "Recycling Method of Leachate "Biological Treatment + Nanofiltration Process" Membrane Retained Liquid" discloses a method for recycling leachate "Biological Treatment + Nanofiltration Process" membrane retained liquid. Although this method can obtain Organic liquid fertilizer with high organic matter (humic acid) solid content, but high operating costs, complicated maintenance and management, and the operation of submerged combustion evaporation unit has disadvantages such as poor separation effect of organic matter (humic acid) and inorganic salts, large energy consumption, etc.

Method used

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  • Extraction method of humic acid

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Effect test

Embodiment 1

[0018] Humic acid extraction method technical parameters in leachate MBR+NF membrane retentate of the present invention:

[0019] 1. Water quality conditions of leachate MBR+NF membrane retentate

[0020] pH 6.0~8.0

[0021] COD cr 1500~8000mg / L

[0022] BOD 5 <50mg / L

[0023] TDS 10000~15000mg / L

[0024] 2. Nanofiltration system

[0025] Working pressure 0.6~1.8MPa

[0026] Concentration times 1.5~5 times

[0027]Molecular weight cut off 150~500Da

[0028] 3. Ultrafiltration system

[0029] Working pressure 0.8~1.8MPa

[0030] Concentration times 5~10 times

[0031] Molecular weight cut off 500~1000Da

[0032] Humic acid ≥30g / L

Embodiment 2

[0034] The sanitary landfill started operation in 2002, with a daily production of 150 tons of leachate. The water quality is as follows: pH is 8.0~8.8, COD cr 1800~2800mg / L, BOD 5 The concentration of heavy metals is 400~780mg / L, the conductivity is 13.2~18.1ms / cm, the concentration of heavy metals is lower than the primary discharge standard, and the color is grayish black to yellow. The leachate main treatment system adopts MBR+NF process, and the effluent reaches the first-class discharge standard stably. The water quality of the leachate MBR+NF membrane retentate is: pH 6.5~8.0, COD cr The concentration of humic acid is 2500~3300mg / L, the concentration of humic acid is about 1700~2300mg / L, and the TDS is 13000~14000mg / L. The membrane retentate can be directly lifted by the pump into the nanofiltration system. The relative molecular weight cut-off (MWCO) of the nanofiltration membrane is 150~500, the operating pressure difference is 0.6~1.8Mpa, and the concentration rati...

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Abstract

The invention discloses an extraction method of humic acid, namely an NF+UF extraction method of humic acid in percolate MBR+NF membrane trapped fluid. The extraction method is advanced, economic, free of secondary pollution and convenient and reliable to operate and has simple flow and small occupied area, and equipment used in the extraction method is simple.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and in particular relates to an extraction method for separating humic acid from leachate MBR+NF membrane retentate of urban domestic garbage landfill and concentrating it into humic acid-containing water-soluble fertilizer. Background technique [0002] The leachate of municipal solid waste landfill is a kind of high-concentration organic wastewater with high pollution intensity and extremely difficult to treat. At present, the leachate treatment technologies include biological method and physicochemical method. In the actual treatment project, the combined process of biological treatment + membrane separation is generally adopted. First, the high concentration of ammonia nitrogen in the leachate is removed up to the standard through biological treatment, and the degradable organic matter is also basically purified, while the residual The vast majority of refractory organics are humic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H99/00C05F11/02
Inventor 许玉东柯金井黄友福
Owner FUZHOU UNIV
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