Method for reusing ammonia nitrogen containing effluent as circular cooling water

A technology for circulating cooling water and sewage, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2003-05-14
RES INST OF BEIJING YANSHAN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application CN1258649A discloses a multi-component composite scale and corrosion inhibitor, the scale and corrosion inhibitor mainly includes organic phosphonic acid, sulfonic acid-containing copolymer and zinc salt, which can be used to treat petrochemical wastewater after secondary biochemical treatment The disadvantage is that the multi-component composite scale and corrosion inhibitor can only be used for the treatment of petrochemical wastewater with very little ammonia nitrogen content (0.14-1.88mg / L) as circulating water for replenishment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation process: prepare 80g medicinal solution

[0033] Take by weighing 12g sodium hexametaphosphate and be dissolved in 26.5g water, stir and dissolve, then add 20g solid content respectively and be the AA / AMPS / HPA sulfonate terpolymer of 30% (weight ratio is AA / AMPS / HPA=60 / 20 / 20) and 4g active components are 50% PBTCA, finally add 10 drops of dilute sulfuric acid of 17.5g zinc sulfate heptahydrate and 1:3 (volume ratio of concentrated sulfuric acid and water), fully dissolve, shake up, promptly obtain 80g of medicament solution to be prepared.

[0034] When the prepared drug solution is added to the test water at a drug concentration of 80mg / L, sodium hexametaphosphate, AA / AMPS / HPA sulfonate terpolymer, PBTCA, Zn 2+ The effective concentrations are 12mg / L, 6mg / L, 2mg / L, 4mg / L respectively. The pH of the solution was then adjusted and stabilized at 8.5-9.0 with 4% NaOH.

[0035] The raw water quality of the test is: ammonia nitrogen 26mg / L, Ca 2+ 185mg / L, to...

Embodiment 2

[0037] Preparation process: prepare 80g medicinal solution

[0038] Take by weighing 6g sodium tripolyphosphate and be dissolved in 32.5g water, stir to dissolve, then add 20g solid content respectively and be the AA / AMPS / HPA sulfonate terpolymer of 30% (weight ratio is AA / AMPS / HPA=60 / 20 / 20) and 4g active components are 50% PBTCA, finally add 10 drops of dilute sulfuric acid of 17.5g zinc sulfate heptahydrate and 1:3 (volume ratio of concentrated sulfuric acid and water), make it fully dissolve, shake up, Promptly obtain the 80g medicament solution of required preparation.

[0039] When the prepared drug solution is added to the test water at a drug concentration of 80 mg / L, sodium tripolyphosphate, AA / AMPS / HPA sulfonate terpolymer, PBTCA, Zn 2+ The effective concentrations are 6mg / L, 6mg / L, 2mg / L, 4mg / L respectively. The pH of the solution was then adjusted and stabilized at 9.0-9.5 with 4% KOH.

[0040] The raw water quality of the test is: ammonia nitrogen 26mg / L, Ca 2...

Embodiment 3

[0042] Preparation process: prepare 80g medicinal solution

[0043] Take by weighing 14g sodium hexametaphosphate and be dissolved in 35.75g water, stir to dissolve, then add respectively 20g solid content and be 30% AA / AMPS sulfonate binary copolymer (weight ratio is AA / AMPS=60 / 40) and 4g The active ingredient is 50% HEDP, and finally 6.25g of anhydrous zinc chloride is added, fully dissolved, shaken well, and 80g of the medicament solution to be prepared is obtained.

[0044] When the prepared drug solution is added to the test water with a drug concentration of 80 mg / L, sodium hexametaphosphate, AA / AMPS sulfonate binary copolymer, HEDP, Zn 2+ The effective concentrations are 14mg / L, 6mg / L, 2mg / L, 3mg / L respectively. Then add NaHCO to the water 3 (as CaCO 3 Total) 250mg / L.

[0045] The raw water quality of the test is: ammonia nitrogen 102mg / L, Ca 2+ 174mg / L, total alkalinity 103mg / L, Cl - 99.3mg / L, SO 4 2- 435mg / L, pH8.3, COD Cr 56mg / L.

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Abstract

The method of reusing ammonia nitrogen containing effluent as circular cooling water is characterized by the addition of alkali, bicarbonate, carbonate, hydrophosphate, dihydric phosphate or phosphate to increase the scaling factor of water and the cooperation with scale-inhibiting corrosion inhibitor and bactericide to control corrosion, scaling and bacterial growth in the reused effluent. The method of the present invention is suitable for reusing ammonia nitrogen containing effluent as circular cooling water.

Description

technical field [0001] The invention relates to a method for recycling ammonia-nitrogen-containing sewage into circulating cooling water. More specifically, the invention relates to a circulating water treatment method for using the ammonia-nitrogen-containing sewage as replenishing water for a circulating cooling water system after secondary biochemical treatment. Background technique [0002] Usually, the crude oil used in refineries contains nitrogen-containing compounds. During the refining process of crude oil, a material flow containing ammonia nitrogen will be produced. Although most of the useful ammonia is recovered from this material flow through the ammonia refining process, some ammonia will inevitably enter The sewage system is formed to form sewage containing ammonia nitrogen. At present, this part of ammonia nitrogen-containing sewage is generally sent to the sewage treatment plant for secondary biochemical treatment and discharged, and has not been recycled a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 郦和生李春丽王岽成敏任志峰董丽艳张士义汪鉴郭红卫张春原
Owner RES INST OF BEIJING YANSHAN PETROCHEM
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