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Two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater

A biological treatment and collaborative treatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high infrastructure costs and operating costs, and achieve rich and diverse biological phases, The effect of reducing processing costs, reducing land occupation and investment

Inactive Publication Date: 2012-05-23
正坤德(天津)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some processes reach more than 48 hours, and the capital construction cost and operating cost are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add lime water lye with a mass percentage concentration of 6% to the PVC acid-base wastewater in a chemical company that produces PVC to adjust the pH range of the wastewater to 9-10, and add 0.6% coagulant FeSO 4 and 0.03% coagulant PAM;

[0038] Then carry out the second stage coagulation treatment: add again the lime water lye that mass percent concentration is 6% to adjust the wastewater pH value to 10-11, and add 0.4% coagulant PAC and 0.02% coagulant HCA (cation coagulant) to precipitate organic monomers that are difficult to remove at low pH from wastewater.

[0039] Among them, the coagulant and the coagulant are added by mass percentage based on the total mass of PVC acid-base wastewater to be treated.

[0040] Discharge the PVC acid-base wastewater that has undergone secondary coagulation treatment into the internal biological area of ​​the annular biological treatment tank, and use activated sludge for the first-level biological treatment. The working cycle ...

Embodiment 2

[0047] Add lime water lye with a mass percentage concentration of 4% to the printing and dyeing wastewater in a printing and dyeing enterprise to adjust the pH range of the wastewater to 8-9, and add 0.6% coagulant FeSO 4 and 0.03% coagulant PAM;

[0048] Then carry out the second stage coagulation treatment: add again the lime water lye that mass percent concentration is 6% to adjust the wastewater pH value to 10-11, and add 0.4% coagulant PAC and 0.02% coagulant HCA (cation coagulant) to precipitate organic monomers that are difficult to remove at low pH from wastewater.

[0049] Among them, the coagulant and the coagulant are added by mass percentage based on the total mass of PVC acid-base wastewater to be treated.

[0050] Printing and dyeing wastewater enters the ring biological treatment tank for biological synergistic treatment after coagulation treatment. First, it enters the internal biological area and uses activated sludge for first-level biological treatment. The...

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Abstract

The invention discloses a two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater, comprising the following steps of: adjusting pH value of the PVC acid-alkali wastewater to be processed to 8.5-9.5, and adding 0.3-1.2% of a coagulant and 0.01-0.03% of a coagulant aid; adjusting the pH value to 9.5-10.5, and adding 0.3-0.6% of a coagulant and 0.01-0.03% of a coagulant aid; successively carrying out a first-stage biological treatment and a second-stage biological treatment on the PVC acid-alkali wastewater which has undergone the two-stage coagulation treatment; then carrying out solid-liquid separation and finally discharging the processed PVC acid-alkali wastewater. According to the invention, the technology solves the problems of no solid-liquid separation and internal sludge backflow. The possibility of independent application of a single device is increased. Land occupation and investment are minimized. Operation cost is reduced. The problem of sludge backflow can be solved in one device and the processing effect is more stable and reliable. The operation is convenient and maintenance is simple.

Description

technical field [0001] The invention relates to the field of high-salt acid-base wastewater treatment process in the chemical industry, in particular to a graded coagulation synergistic biological treatment process for PVC acid-base wastewater. Background technique [0002] Polyvinyl chloride plastic (PVC) in the chemical industry has good corrosion resistance, is not easily corroded by concentrated hydrochloric acid, phosphoric acid, hydrogen fluoride, concentrated alkali, etc., and is stable in most acid-base salt solutions. PVC acid-base wastewater has the characteristics of high salt content, difficult biodegradation, and complex composition. During the treatment and reuse of PVC acid-base wastewater, it is difficult to achieve a good treatment effect if conventional biological treatment process or coagulation treatment process is used alone. Moreover, the treatment efficiency is low and energy consumption is high, which makes many types of enterprises or similar sewage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 毕桂军伊学农冯宗强
Owner 正坤德(天津)环保科技有限公司
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