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Biochemical treatment method of epoxy chloropropane waste water

An epichlorohydrin and biochemical treatment technology, applied in natural water treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of high production cost, microbial calcification, sludge compaction, etc., and achieve low treatment cost , The effect of high processing efficiency and small dosage

Active 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. The COD concentration is 800mg / L, the calcium ion concentration is 4000mg / L, and the total salt content is 1.2%. The treatment system adopts the sequencing batch activated sludge method, the treatment temperature is 30°C, the pH is 8.0, 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 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 3500mg / L; at the same time, the concentrated bacterial solution of the above-mentioned cultured salt-tolerant bacteria is added, and the dosage is 0.1% of the volume of the treated wastewater per hour. The COD concentration in the treated wastew...

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 35°C, the pH is 6.0, and the dissolved oxygen is 2-3mg / L. When starting, control the calcium ion concentration in the influent to 200mg / L, and the COD removal rate can reach more than 90% within 36 hours for 3 consecutive batches.

[0031] Increase the concentration of influent water, and increase the concentration of calcium ions by 80mg / L each time until the concentration of calcium ions is 2000mg / L; at the same time, add the concentrated bacterial solution of the above-mentioned cultured salt-tolerant bacteria, and the dosage is based on the wastewater treated per hour Dosing at 0.5% of the volume. The COD concentration in the tr...

Embodiment 3

[0033] 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, control the calcium ion concentration in the influent water to 500mg / L, and the COD removal rate can reach more than 90% within 36 hours for three 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 solution of the above-mentioned cultured salt-tolerant bacteria is added, and the dosage is 0.5% of the volume of the treated wastewater per hour. The COD concentration in the treated wastewater is lower than 60mg / L,...

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Abstract

The invention relates to a biochemical treatment method of epoxy chloropropane waste water. According to the biochemical treatment method of epoxy chloropropane waste water, COD and calcium ion concentration of injected water are increased gradually, a halotolerant bacteria is added, wherein the halotolerant bacteria is microbacterium kitamiense FSTB-4, is preserved in China General Microbiological Culture Collection Center on 1th, June, 2015, and preservation number is CGMCC No.10939. The specific halotolerant bacteria is added in biochemical treatment process of epoxy chloropropane waste water, the treatment system is capable of tolerating high salinity and high calcium environment, high efficiency removing of COD in waste water is realized, technology is simple, treatment efficiency is high, and treatment cost is low.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a biochemical treatment method for 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 compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F103/36
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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