Treatment method of organic waste water with high calcium and high pH value

A technology for organic wastewater and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. The effect of simplifying management and reducing the cost of acid addition

Inactive Publication Date: 2013-03-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for treating organic wastewater with high calcium content and high pH value, so as to solve the problem of dilution

Method used

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  • Treatment method of organic waste water with high calcium and high pH value
  • Treatment method of organic waste water with high calcium and high pH value

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. See attached table 1 for the comparison between direct biological treatment of wastewater with high calcium chloride content and high pH and dilution with water and neutralization with hydrochloric acid.

[0024] Schedule 1

[0025]

[0026] 2. The raw wastewater and the diluted and neutralized wastewater enter an aeration tank respectively, and after 16 hours of biological treatment, most of the organic matter is removed, and the COD and BOD after direct biological treatment 5 The average removal rate reaches 88% and 96% respectively; COD and BOD after biological treatment after dilution and neutralization 5 The average removal rates reached 89% and 98%, respectively.

[0027] 3. After the first stage of biological treatment, the effluent enters the second stage of contact oxidation to further remove organic matter. After the second stage of biological treatment, the total effluent COD and BOD after direct biological treatment 5 The removal rate reaches 94% an...

Embodiment 2

[0029] 1. See Attached Table 2 for the high calcium chloride content and high pH wastewater quality of a propylene oxide production plant.

[0030] Schedule 2

[0031] Analysis Project

Raw wastewater

A traditional aeration treatment

Two stage contact oxidation treatment

pH

11.4

8.1

7.1

Ca(OH) 2 ,mg / L

610

/

/

CaCl 2 ,%

2.6

2.5

2.5

COD, mg / L

1030

308

55

COD removal rate, %

70

95

BOD 5 ,mg / L

577

28

9

BOD 5 , removal rate, %

95

98

hydraulic retention time, h

18

12

Sludge concentration, g / L

24.6

Average sludge return ratio, %

130

Aeration intensity, m 3 / m 2 h

10

5

Surface load of sedimentation tank, m 3 / m 2 h

0.94

0.87

[0032] 2. The wastewater that has been ...

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Abstract

A treatment method of organic waste water with high calcium and a high pH value belongs to the technical field of organic waste water treatment. The treatment method particularly comprises the following steps: (1) pretreating the waste water to control the fluctuation range of the calcium chloride concentration within a day to be not more than 10%, and to control the calcium hydroxide/BOD5 ratio to be not more than 1.2; (2) allowing the pretreated waste water to enter a first section for traditional aeration biological treatment; (3) allowing the effluent from biological treatment in the first section to enter a second section for oxidation biological treatment; (4) adopting the total effluent after biological treatment as water for adjustment. The invention provides the treatment method which needs no dilution by adding water, and no pH value reduction by adding acids; taking annual treatment of 2,500,000 tons of waste water with high calcium and a high pH value for example, at least 100% of dilution water is reduced, and acid adding cost of 3,700,000 yuan is reduced annually.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and more particularly relates to a treatment method for organic wastewater with high calcium and high pH value. Background technique [0002] The organic matter content (COD) contained in the cyclization wastewater discharged from the process of producing propylene oxide and epichlorohydrin by the chlorohydrin method is 1000-2000 mg / L, which needs to be treated before being discharged. However, because the cyclization wastewater has the characteristics of high calcium chloride content (2.5-5% calcium chloride content) and high pH value (pH: 10.5-12), it brings certain difficulties to the treatment. In order to reduce the difficulty of treatment, the manufacturers all adopt the methods of diluting the concentration of calcium chloride and calcium with water and adding acid to reduce the pH value to treat the wastewater, so that the scale of treatment and operating costs are in...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 刘正童健崑龚小芝赵辉
Owner CHINA PETROLEUM & CHEM CORP
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