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Method for treating epichlorohydrin wastewater

A technology for epichlorohydrin and wastewater, applied in the direction of microbial-based methods, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as microbial calcification, high production costs, and complicated preparation processes, and achieve high treatment efficiency , low processing cost, and efficient removal effect

Inactive Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment processes mostly use A / O, SBR and MBR, etc., and the operating pH value is mostly between 7.5-8.5. In the actual operation process, the following problems are prone to occur: (1) The wastewater treatment effect of the biological process section after a period of operation (2) The improvement of sludge settling performance leads to dense sludge and poor sludge treatment effect; (3) High concentration of calcium ions are transformed into calcium carbonate, calcium sulfate and other calcium insoluble substances attached to microorganisms, Causes microbial calcification, reducing the performance of microorganisms in treating wastewater
This method requires the cultivation of multiple bacterial strains for compounding to prepare salt-tolerant bacterial agents, the preparation process is complicated, and the production cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin, in which the COD concentration is 800mg / L, calcium ion concentration: 4000mg / L, and total salt content: 1.2wt%. The treatment system adopts the sequencing batch activated sludge method, the treatment temperature is 30°C, the pH is 7.0, and the dissolved oxygen is 2-3mg / L. When starting up, control the calcium ion concentration in the influent to 750mg / L, and the COD removal rate can reach more than 90% within 48 hours for three consecutive batches. Increase the influent concentration, and increase the calcium ion concentration by 50mg / L each time until it reaches calcium The ion concentration is 4000mg / L; at the same time, the concentrated bacterial liquid product of the above-mentioned cultured salt-tolerant bacteria is added, and the dosage is 0.1% of the volume of wastewater treated per hour. The COD concentration in the treated wastewater ...

Embodiment 2

[0030] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin, in which the COD concentration is 1450mg / L, calcium ion concentration: 2500mg / L, and total salt content: 2.4%. The treatment system adopts the sequencing batch activated sludge method, the treatment temperature is 40°C, the pH is 6.0, and the dissolved oxygen is 2-3mg / L. When starting up, control the concentration of calcium ions in the influent to 250mg / L, and the COD removal rate can reach more than 90% within 36 hours for 3 consecutive batches. Increase the concentration of influent, and increase the concentration of calcium ions by 80mg / L each time until it reaches the level of calcium The ion concentration is 2500mg / L; at the same time, the concentrated bacterial liquid product of the above-mentioned cultured salt-tolerant bacteria is added, and the dosage is 0.4% of the volume of wastewater treated per hour. The COD concentration in the ...

Embodiment 3

[0032] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin, in which the COD concentration is 2350mg / L, calcium ion concentration: 3000mg / L, and total salt content: 2.8%. The treatment system is membrane biological method, the treatment temperature is 35°C, the pH is 7.5, and the dissolved oxygen is 2-3mg / L. When starting up, control the calcium ion concentration in the influent water to 600mg / L, and the COD removal rate can reach more than 90% within 36 hours for 3 consecutive batches. Increase the influent concentration, and increase the calcium ion concentration by 100mg / L each time until it reaches calcium The ion concentration is 3000mg / L; at the same time, the concentrated bacterial liquid product of the above-mentioned cultured salt-tolerant bacteria is added, and the dosage is 0.4% of the volume of wastewater treated per hour. The COD concentration in the treated wastewater is lower than 60mg / L...

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PUM

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Abstract

The invention relates to a method for treating epichlorohydrin wastewater. The epichlorohydrin wastewater is treated by a biochemical process, in a treatment process, a mode of increasing the concentrations of COD and calcium ions in water step by step is adopted, and meanwhile, halotolerant bacteria are fed, are Pseudomonas stutzeri FSTB-5, and have been deposited in the China General Microbiological Culture Collection Center with the accession number of CGMCC No. 10940. The specific halotolerant bacteria are fed in the a biochemical treatment process of the epichlorohydrin wastewater, a treatment system can bear environments with high salinity and high calcium, and COD in the wastewater can be removed effectively. The method has the characteristics of simple process, high treatment efficiency, low treatment cost and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a method for treating epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin is an important intermediate in organic synthesis, mainly used in the production of fine chemical products such as epoxy resin, synthetic glycerin, and chlorohydrin rubber. The high-temperature chlorination of propylene is a classic method for the industrial production of epichlorohydrin. The sewage generated in the process has the characteristics of large water volume, high salinity, and high calcium ion concentration. It is difficult and expensive to treat alone. At present, relevant enterprises basically adopt biochemical treatment process after mixing with wastewater from other production units, but this often leads to calcium deposition in the biochemical treatment system, which causes the increase of inorganic components in activa...

Claims

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Application Information

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IPC IPC(8): C02F3/34C12N1/20C02F101/36C12R1/38
CPCC02F3/34C02F2101/36C12N1/20C12N1/205C12R2001/38
Inventor 郭志华高会杰孙丹凤赵胜楠李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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