Treatment method of epichlorohydrin wastewater

A technology of epichlorohydrin and treatment methods, applied in natural water treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high production cost, microbial calcification, and sludge compaction, and achieve The effect of low processing cost, 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 e...

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, control the calcium ion concentration in the influent water 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 solution 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 is ...

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 8.0, and the dissolved oxygen is 2-3mg / L. When starting up, control the calcium ion concentration in the influent water to 250mg / 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 80mg / L each time until it reaches 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 0.5% of the volume of wastewater treated per hour. The COD concentration in the treated wastewater...

Embodiment 3

[0032] A certain enterprise produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 2350mg / L, the calcium ion concentration is 3000mg / L, and the total salt content is 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 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 0.5% of the volume of wastewater treated per hour. The COD concentration in the treated wastewater is lower than 60mg / L...

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Abstract

The invention relates to a treatment method of epichlorohydrin wastewater. The treatment method is characterized in that a biochemical method is used to treat the epichlorohydrin wastewater, a manner gradually increasing the concentration of COD and calcium ions in inlet water is adopted during treatment, a halotolerant bacterium is added at the same time, the halotolerant bacterium is (Paracoccus sp.) FSTB-2 which is preserved in China General Microbiological Culture Collection Center on June 1st, 2015, and the preservation number of the (Paracoccus sp.) FSTB-2 is CGMCC No. 10938. The treatment method has the advantages that the specific halotolerant bacterium is added during the treatment of the epichlorohydrin wastewater, a treatment system can tolerate high-salt and high-calcium environments, COD in the wastewater can be removed efficiently, and the method is simple in process, high in treatment efficiency, low in 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 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 components in activ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/30C02F3/00C02F103/36
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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