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A treatment method and resource-based technology, applied in the field of wastewater treatment, can solve the problem of underutilization of crystalline salt, and achieve the effect of solving the problem of water pollution, reducing operation and investment costs, and reducing load
Active Publication Date: 2020-07-03
GREENTECH ENVIRONMENTAL CO LTD
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[0006]
However, using the above process to treat viscose wastewater, the wastewater can be partially or completely reused, but the crystalline salt in the viscose wastewater has not been fully utilized
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[0041] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0042] Implementation column 1
[0043] like figure 1 Shown, a kind of viscose wastewater resource treatment method comprises the following steps:
[0044] S1), the acidic wastewater and alkaline wastewater of viscose wastewater are filtered through the grid and then pumped to the neutralization aeration tank for neutralization reaction through raw water, and the H contained in the wastewater can be removed by aeration 2 S and CS 2 The gas is blown out, and a large amount of organic matter such as cellulose and hemicellulose is precipitated. The concentration of sulfur ions in the wastewater discharged from the neutralization aeration tank can be reduced to less than 1mg / L, and the toxic gas H2 S and CS 2 Collected by exhaust gas collection device.
[0045] S2), the above-mentioned waste water after mixed aeration is input into the coagulation...
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Abstract
The invention provides a viscose wastewater resourceful treatment method, which comprises the following steps: sequentially carrying out neutralization aeration, coagulating sedimentation, advanced oxidation, primary softening clarification, ultrafiltration, reverse osmosis, concentrated water softening clarification, filtration, ion exchange, concentrated water reverse osmosis, high-pressure reverse osmosis, forward osmosis, evaporative crystallization, potassium sulfate conversion, sodium chloride crystallization and mother liquor drying treatment on viscose wastewater so as to achieve reuseof all the wastewater and produce potassium sulfate and sodium chloride crystalline salts. According to the method, zero discharge of viscose wastewater is realized, and water is completely recycledthrough membrane concentration and evaporative crystallization so as to avoid pollution to the external environment; multi-stage reverse osmosis and forward osmosis processes are comprehensively utilized, so that the load of a thermal evaporation stage is greatly reduced, the method has the advantages of low energy consumption and high efficiency, and the operation and investment cost of the system can be reduced; and the produced sodium sulfate is converted into potassium sulfate with high value, and the potassium sulfate can be used in the chemical fertilizer industry, so that the problem ofwater pollution of fiber production enterprises is solved, and high economic value can be brought.
Description
technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for resourceful treatment of viscose wastewater. Background technique [0002] Viscose wastewater is a large amount of wastewater produced in the production process of viscose fiber. Viscose fiber wastewater has high suspended solids content, large chroma, high BOD and COD, low N, P element content, poor biodegradability, and easy treatment. Difficulty and other characteristics, is more difficult to treat wastewater. Viscose wastewater has high salt content, and the main inorganic ions are sodium ions and sulfate radicals. [0003] At present, the domestic treatment processes for viscose wastewater mainly include mixing and neutralization, stripping to remove sulfide, precipitation and zinc removal, etc., but these treatment processes have problems such as low organic matter removal efficiency and unstable operation effect. Moreover, direct discharge after...
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