Pretreatment method of organic wastewater difficult to biochemically degrade

A technology for organic wastewater and pretreatment, which is applied in mechanical vibration water/sewage treatment, anaerobic digestion treatment, chemical instruments and methods, etc., and can solve problems such as the need to strengthen the treatment capacity, the need to improve the biodegradability, and the less obvious effect. , to increase the effective sludge concentration, improve the processing capacity and adaptability, and achieve the effect of simple process

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, the improvement of biodegradability of wastewater by this process needs to be improved, and the treatment capacity needs to be strengthened, and the effect is not obvious yet.

Method used

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  • Pretreatment method of organic wastewater difficult to biochemically degrade

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Experimental program
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Effect test

Embodiment 1

[0015] The water quality of heavy oil production water in an oilfield fluctuates greatly, and its COD Cr Between 300~500mg / L, BOD 5 Between 40~70mg / L, BOD 5 with COD Cr If the ratio does not exceed 0.15, the biodegradability of sewage is poor, and it is difficult to directly treat it with aerobic biological method. It is necessary to use hydrolytic acidification for pretreatment to improve the biodegradability of sewage. Firstly, the facultative activated sludge was taken from the anoxic section of the sewage biochemical treatment system of the oilfield refinery, put into the hydrolysis acidification reaction tank together with the suspended filler, and domesticated and cultivated with the produced water of heavy oil. After the sludge has been cultivated and trained for 15 days, the sludge concentration on the surface of the suspended filler can reach about 16g / L. When the influent flow rate is 10-20L / h and the residence time is 4-8h, extract the attached sludge every 4h. ...

Embodiment 2

[0017] The water quality of heavy oil production water in an oilfield fluctuates greatly, and its COD Cr Between 300~500mg / L, BOD 5 Between 40~70mg / L, BOD 5 with COD Cr If the ratio does not exceed 0.15, the biodegradability of sewage is poor, and it is difficult to directly treat it with aerobic biological method. It is necessary to use hydrolytic acidification for pretreatment to improve the biodegradability of sewage. Firstly, the facultative activated sludge was taken from the anoxic section of the sewage biochemical treatment system of the oilfield refinery, put into the hydrolysis acidification reaction tank together with the suspended filler, and domesticated and cultivated with the produced water of heavy oil. After the sludge has been cultivated and trained for 15 days, the sludge concentration on the surface of the suspended filler can reach about 16g / L. When the influent flow rate is 10-20L / h and the residence time is 4-8h, extract the attached sludge every 4h. ...

Embodiment 3

[0019] The water quality of heavy oil production water in an oilfield fluctuates greatly, and its COD Cr Between 300~500mg / L, BOD 5 Between 40~70mg / L, BOD 5 with COD Cr If the ratio does not exceed 0.15, the biodegradability of sewage is poor, and it is difficult to directly treat it with aerobic biological method. It is necessary to use hydrolytic acidification for pretreatment to improve the biodegradability of sewage. Firstly, the facultative activated sludge was taken from the anoxic section of the sewage biochemical treatment system of the oilfield refinery, put into the hydrolysis acidification reaction tank together with the suspended filler, and domesticated and cultivated with the produced water of heavy oil. After the sludge has been cultivated and trained for 15 days, the sludge concentration on the surface of the suspended filler can reach about 16g / L. When the influent flow rate is 10-20L / h and the residence time is 4-8h, extract the attached sludge every 4h. ...

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Abstract

The invention relates to a pretreatment method of organic wastewater difficult to biochemically degrade in the technical field of industrial wastewater treatment. The method comprises the following steps: organic wastewater passes through the suspended carrier which is arranged in a hydrolysis acidification reactor and activated sludge which sticks to the surface of the suspended carrier and then is discharged; the suspended carrier is transferred to an ultrasonic generator by an airlift pump, is irradiated and then flows back to the water inlet end of the hydrolysis acidification reactor; and the suspended carrier is mixed with the carrier in the hydrolysis acidification reactor to preferentially contact with the water inflow of the hydrolysis acidification reactor, and the activity of the microorganisms on the surface of the carrier is utilized to treat organic wastewater. By adopting the method, the treatment capability of the hydrolysis acidification technology can be increased, and the biodegradability of wastewater can be improved.

Description

technical field [0001] The invention relates to a hydrolytic acidification treatment process for improving the biodegradability of organic wastewater, especially a hydrolysis acidification treatment process suitable for improving the biodegradability of refractory organic wastewater such as heavy oil produced water or oil field polymer flooding containing HPAM produced water , belongs to the technical field of industrial wastewater treatment. Background technique [0002] Organic wastewater has a wide range of sources and is an important source of water pollution. However, the refractory biodegradable wastewater has poor biodegradability, often has the characteristics of high concentration of organic pollutants, complex components, etc., and often contains microbial toxic substances such as cyanide, sulfur, phenols, heavy metal salts, etc., which makes the refractory organic wastewater processing posed great difficulties. At present, the treatment of refractory organic was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F1/36
Inventor 曹宗仑张英雄平春霞邢琳马友富
Owner CHINA PETROLEUM & CHEM CORP
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