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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] Magnetic coagulation was used to treat tannery wastewater. The pH, chroma, turbidity, COD, TOC, SS, and conductivity of the wastewater were 7.57, 550, 563, 1647mg / L, 206.4mg / L, 2150mg / L and 8.03mS / cm. PAC and PAM are used as coagulant and coagulant, and the dosage is 600 and 4mg / L respectively. The slow stirring rate is 50 rpm, and the fast stirring rate and time are 300 rpm and 20 s, respectively. The turbidity of the coagulated effluent 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 and hot sides is 20, 50 ℃ respectively, continuous operation for 24h, the effluent conductivity is 6μS / cm, and the product water flux is 14.23kg / m 2 .h, the removal rate of suspended solids, potassium, calcium, sodium, magnesium, sulfate, Cl, and COD are all higher than 97%, the conductivity of the produced water continues to decrease during two day...

Example Embodiment

[0031] Example 2

[0032] Using the above coagulation process to treat tannery wastewater, the coagulant and conditions are as in the above example, the magnetic seed is added 400mg / L, and the particle size of the magnetic seed is 200 meshes, which can significantly shorten the settling time, from the original 30min to 5min. The water turbidity is less than 1.5NTU. At the same time, the sludge output is 1 / 2. The magnetic coagulation product water is subjected to ceramic membrane microfiltration treatment. The ceramic membrane is made of alumina material with an average pore diameter of 0.1μm and a flux of 480kg / m 2 At .h, the transmembrane pressure difference will increase from 3kPa to 8kPa for two consecutive days. The turbidity of the product water is lower than 0.5NTU, and the color removal rate is 46%. After that, membrane distillation is used, and PVDF hydrophobic membrane is used. The temperature of the cold and hot sides is 20 and 50℃ respectively, and the water flux is ...

Example Embodiment

[0033] Example 3

[0034] The tannery wastewater after magnetic coagulation in Example 2 is used for ceramic membrane treatment. The ceramic membrane is a composite material of alumina and zirconia, and the membrane pore size is 0.1 μm. Operating flux is 480kg / m 2 .h, using continuous operation conditions of 1h and 1min backflushing, which can achieve significant control of membrane fouling. After running for two consecutive days, the transmembrane pressure difference is only 4.5kPa. Ceramic membrane water production is not affected by the ceramic membrane pressure, and the water turbidity is less than 0.5NTU. Afterwards, membrane distillation is used, the hydrophobic membrane is PVDF-CTFE, the temperature of the hot and cold sides is 20, 65℃, and the water flux is 21.37kg / m 2 .h, the conductivity significantly decreased to 9μS / cm in the first 50h of continuous operation, and then slowly increased, and the conductivity of the water produced during continuous 400h operation was l...

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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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