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Combined process for advanced treatment of high-concentration and high-salt industrial wastewater

A technology for industrial wastewater and advanced treatment, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of sludge moisture content, volume reduction, high chemical stability

Inactive Publication Date: 2020-04-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three processes have good tolerance to water quality and quantity, so they have significant advantages in the treatment of industrial wastewater, but they still receive less attention in industrial wastewater, especially the combined process has not yet received attention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using magnetic coagulation to treat tannery wastewater, the pH, chroma, turbidity, COD, TOC, SS, and conductivity of the wastewater are 7.57, 550, 563, 1647mg / L, 206.4mg / L, 2150mg / L and 8.03mS / cm. PAC and PAM are used as coagulant and coagulant aid, and the dosage is 600 and 4mg / L respectively. Slow stirring speed is 50rpm, fast stirring speed and time are respectively 300rpm and 20s. The turbidity of coagulated water is lower than 2.5NTU. The coagulation product water is directly subjected to membrane distillation treatment, using PVDF hydrophobic membrane, the temperature of the cold side and the hot side are 20, 50 ℃, and the continuous operation is 24 hours. 2 .h, the removal rates of suspended solids, potassium, calcium, sodium, magnesium, sulfate, Cl, and COD were all higher than 97%, the conductance of the product water continued to decrease during two days of continuous operation, and the membrane flux attenuation rate was 5%.

Embodiment 2

[0032] Using the above coagulation process to treat tannery wastewater, the coagulant and conditions are as in the above example, adding 400 mg / L of magnetic seeds, and the particle size of the magnetic seeds is 200 mesh, which can significantly shorten the settling time from 30 minutes to 5 minutes, and produce The water turbidity is lower than 1.5NTU. At the same time, the sludge output is 1 / 2 of the original. The water produced by magnetic coagulation is subjected to ceramic membrane microfiltration treatment. The ceramic membrane is made of alumina material, the average pore size of the membrane is 0.1μm, and the flux is 480kg / m 2 The transmembrane pressure difference increased from 3kPa to 8kPa during continuous operation for two days at .h. The turbidity of the product water is lower than 0.5NTU, and the color removal rate is 46%. Afterwards, membrane distillation treatment was adopted, using PVDF hydrophobic membrane, the temperatures of the cold and hot sides were 20...

Embodiment 3

[0034] The tannery wastewater after magnetic coagulation in Example 2 is used for ceramic membrane treatment, the ceramic membrane is made of alumina and zirconia composite material, and the membrane pore diameter is 0.1 μm. The operating flux is 480kg / m 2 .h, using the continuous operation condition of running for 1h and backflushing for 1min, significant control of membrane fouling can be achieved. After two days of continuous operation, the transmembrane pressure difference is only 4.5kPa. The water produced by the ceramic membrane is not affected by the pressure of the ceramic membrane, and the turbidity of the produced water is lower than 0.5NTU. Afterwards, membrane distillation is used, the hydrophobic membrane is PVDF-CTFE, the temperature of the cold side and the hot side are 20 and 65°C respectively, and the flux of the produced water is 21.37kg / m 2 .h, the conductance dropped significantly to 9μS / cm in the first 50h of continuous operation, and then increased slow...

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Abstract

The invention discloses a combined process for advanced treatment of high-concentration and high-salt industrial wastewater. The combined process comprises coupling of magnetic coagulation, ceramic membrane microfiltration / ultrafiltration and membrane distillation / membrane crystallization processes. Magnetic coagulation is adopted for pretreatment, rapid and efficient solid-liquid separation is achieved, the settling time is shortened, and sludge reduction is achieved; ceramic membrane microfiltration / ultrafiltration is adopted to realize long-acting stable control of suspended matters under ahigh-flux condition; more than 99% of suspended solids can be removed and organic matters, chromaticity and the like can be controlled through magnetic coagulation-ceramic membrane pretreatment; membrane distillation / crystallization is utilized to intercept organic matters, salts and other non-volatile pollutants, the interception efficiency is higher than 95%, particularly, salt crystallizationrecovery can be realized by a salt crystallization process, and high-quality produced water and concentrated water concentration / salt crystallization are realized. According to the process, long-acting stable treatment of the high-concentration and high-salt industrial wastewater can be realized through a short process, and the process has remarkable tolerance to suspended solids and salt contentof the wastewater and is suitable for treating the industrial wastewater with relatively large water quality and quantity fluctuation.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of industrial wastewater, and in particular relates to a combined process of "magnetic coagulation-ceramic membrane-membrane distillation". Background technique [0002] Industrial wastewater generally has the characteristics of high suspended solids, strong acidity and alkalinity, high chroma, low biochemical ratio, high pollutant concentration, various heavy metals, strong toxicity, and unstable water quality and quantity. Processing is restricted. Overall, the advanced treatment of industrial wastewater can be simply divided into three stages: removal of suspended solids (particles, colloids, fats, oil particles, etc.), removal of organic matter, and desalination. The removal of suspended solids is mainly in the wastewater pretreatment stage, and the removal rate and efficiency of suspended solids are important factors that affect the investment and operation costs as well as the ef...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/30
CPCC02F1/444C02F1/447C02F1/488C02F1/5236C02F1/56C02F9/00C02F2001/007C02F2101/30
Inventor 郑利兵魏源送郁达伟钟慧陈梅雪
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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