Oxidization coagulant for treating coking wastewater

A technology for oxidizing coagulation and coking wastewater, which is used in oxidation water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problem of high cost of Fenton-coagulant, general removal of suspended solids and chroma, and inability to effluent. Stable compliance and other issues, to achieve the effect of large floc particles, low cost, strong compression and dehydration

Inactive Publication Date: 2010-06-16
娄底市裕德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most coking wastewater enterprises in China use biochemical method combined with physicochemical method to treat coking wastewater. Cr , suspended solids, and chroma are further removed, but its dosage is large, and COD is under the condition of high dosage of coagulant Cr The removal efficiency is still unsatisfactory, and the removal effect on suspended solids and chroma is average, and the effluent cannot stably meet the standard
There have been recent reports of retreatment using Fenton-coagulant, which degrades COD Cr The effect is good, but the cost of Fenton-coagulant is high and the condition control is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example example 1

[0009] Weigh 10g of polyferric sulfate, 0.2g of solid ferrate, measure 25ml of 11% sodium hypochlorite, add distilled water to 100ml, mix thoroughly, let it stand for 24 hours, and configure it into an aqueous solution of oxidation coagulant, then weigh 0.1g of polyacrylamide auxiliary Coagulant, add distilled water to configure 100ml of 0.1% aqueous solution.

[0010] Take 1000ml of biochemical effluent from coking wastewater, and do coagulation experiment at 25°C. First, add 2ml of oxidation-coagulant, stir for 30s, then add 3ml of coagulant, stir for 1min, and settle for 30min.

[0011] The experimental situation and results are as follows: the alum flowers are dense, the flocs settle well, the supernatant is clear, and the COD Cr The removal rate can reach 71%, and the chromaticity is less than 80 times.

example example 2

[0013] According to the flocculant polymerized ferric sulfate 15g, solid ferrate 0.8g, add distilled water to 100ml, mix well, let it stand for 24 hours, and configure it as an oxidation coagulant aqueous solution, then weigh 0.2g polyacrylamide coagulant, add distilled water to configure into 100ml of 0.1% aqueous solution.

[0014] Take 1000ml of biochemical effluent from coking wastewater, and do coagulation experiment at 25°C. First, add 2ml of oxidized coagulant, stir for 30s quickly, then add 3ml of coagulant, stir for 1min, and settle for 30min.

[0015] The experimental results are as follows: the alum flowers are dense, the flocs settle well, the supernatant is clear, and the COD Cr The removal rate can reach 70%. Chroma is 280.

example example 3

[0017] According to the flocculant polymerized ferric sulfate 18g, solid ferrate 1.5g, add distilled water to 100ml, mix well, let it stand for 24 hours, and configure it as an oxidation coagulant aqueous solution, then weigh 0.2g polyacrylamide coagulant, add distilled water to configure into 100ml of 0.1% aqueous solution.

[0018] Take 1000ml of biochemical effluent from coking wastewater, and do coagulation experiment at 25°C. First, add 2ml of oxidized coagulant, stir for 30s quickly, then add 3ml of coagulant, stir for 1min, and settle for 30min.

[0019] The experimental results are as follows: the alum flowers are dense, the flocs settle well, the supernatant is clear, and the COD Cr The removal rate can reach 70%. Chroma is 240.

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Abstract

The invention discloses an oxidization coagulant for treating coking wastewater, which consists of two parts of an oxidization flocculant and a coagulant aid. The oxidization flocculant comprises the following components according to proportion by weight: 8-20% of flocculant polyferric sulfate, 0.1-2.0% of oxidant ferrate and the balance of water; and the coagulant aid is polyacrylamide aqueous solution. In the invention, the double functions of oxidization and flocculation are available, the removal rate of the coking wastewater CODcr (Chemical Oxygen Demand) can reach more than 70%, the draining water is clear, the colority is less than 80 times, the adding amount is little, and the cost is low, wherein the medicament cost of advanced treatment is only 0.5 RMB / ton; the condition is easy to control and the operation is convenient. The invention provides an economical and efficient method and powerful assurances for the draining standard of advanced treatment of the coking wastewater.

Description

technical field [0001] The invention relates to a water treatment agent, in particular to an oxidation coagulant used for physical and chemical treatment of coking wastewater after it reaches a secondary settling tank through a biochemical treatment section. Background technique [0002] The pollutant composition of coking wastewater is complex, containing volatile phenols and many refractory aromatic organic compounds, polycyclic compounds and oxygen, sulfur and nitrogen compounds. It is a typical difficult-to-treat organic industrial wastewater, so the treatment of coking wastewater has always been a A major problem in wastewater treatment. At present, most coking wastewater enterprises in China use biochemical method combined with physicochemical method to treat coking wastewater. Cr , suspended solids, and chroma are further removed, but its dosage is large, and COD is under the condition of high dosage of coagulant Cr The removal efficiency is still unsatisfactory, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/52
Inventor 黎理吕宁娟
Owner 娄底市裕德科技有限公司
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