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Treatment method of stainless steel pickling waste water

A technology for pickling wastewater and a treatment method, which is applied in the field of chemical treatment to achieve the effects of reducing treatment costs, not increasing equipment investment, and achieving good results

Active Publication Date: 2010-11-03
陈宇青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, none of the above patents or published technical documents can solve the problems of comprehensive treatment of acid wastewater in the stainless steel production process and the realization of industrialized production.

Method used

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  • Treatment method of stainless steel pickling waste water
  • Treatment method of stainless steel pickling waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The 100 tons of pickling wastewater collected, the stainless steel acid wastewater that entered the comprehensive wastewater treatment station, was sent to the grease trap to remove the oil in the wastewater; then it flowed into the adjustment pool and stayed in the adjustment pool for 6 hours; The waste water is sent to the primary neutralization coagulation tank, and lime milk is added to the tank, and the amount of lime milk used is 650kg; and the amount of compound flocculant is 2-3kg (the ratio of PAM cationic flocculant: non-ionic flocculant is 2 : 1), then adjust the pH of the waste water to 3.6; send the waste water into the pre-sedimentation tank, carry out natural settlement treatment, press filter to remove suspended solids and sand in the waste water; generate about 2.8 tons of sludge in total, of which the priceless waste 1.3 tons of mud (nickel dry basis content 2 , adjust the pH to 9.5, and then add 1kg of PAM non-ionic flocculant to generate alum flowers;...

Embodiment 2

[0038] In the same steps as in the embodiment, the collected 100 tons of pickling waste water is removed in the grease trap to remove the oil in the waste water; then stay in the regulating pond for 4 hours; the regulated waste water is sent to the first-level neutralization coagulation pond , add lime milk to the pool, the amount of lime milk used is 680kg; and the amount of compound flocculant is 2-3kg (the ratio of PAM cationic flocculant: non-ionic flocculant is 1: 1), and then adjust the pH of wastewater to 3.9; then send the wastewater into the pre-sedimentation tank for natural sedimentation treatment, press filtration to remove suspended solids and sand in the wastewater; a total of about 2.7 tons of sludge is produced, of which 1.4 tons of priceless sludge (nickel dry basis content 2 , the pH to 9.7, and then add 1.4kg of PAM non-ionic flocculant to generate alum flowers; then enter the secondary settling tank, and then remove iron, chromium, nickel, etc. ~1.6 tons (ni...

Embodiment 3

[0040] In the same steps as in the embodiment, the collected 100 tons of pickling waste water is removed in the grease trap to remove the oil in the waste water; then stay in the regulating pond for 5 hours; the regulated waste water is sent to the primary neutralization coagulation pond , add milk of lime to the pond, the amount of milk of lime used is 600kg; and the amount of compound flocculant is 3.5kg (the ratio of PAM cationic flocculant: non-ionic flocculant is 1: 1.2), and then adjust the pH of wastewater to 3.9 ;Then the waste water is sent to the pre-sedimentation tank for natural settlement treatment, press filtration to remove suspended solids and sand in the waste water; a total of about 2.7 tons of sludge is produced, of which 1.4 tons of priceless sludge (nickel dry basis content 2 , the pH to 9.7, and then add 1.2kg of PAM non-ionic flocculant to generate alum flowers; then enter the secondary sedimentation tank, and then remove iron, chromium, nickel, etc. ~1.6...

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Abstract

The invention discloses a chemical treatment method, in particular to a method for treating waste water in an environment-friendly mode. The method comprises the steps of oil removal regulation, first-level neutralization / flocculation, first-level sedimentation, aeration oxidation, second-level neutralization / flocculation, second-level sedimentation, aeration oxidation and inclined tube sedimentation. In a first-level neutralization and flocculation pool, lime milk and formulation flocculant are added, and the pH value of the waste water is regulated, wherein the formulation flocculant consists of cationic flocculant and nonionic flocculant. The invention can greatly reduce the treating cost of the waste water and realize recycle of water without adding equipment investment and has the advantages of convenient operation, good effect and the like. The invention can be widely applied to enterprises with chemical engineering pollution.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a method for environmental protection treatment of waste water. technical background [0002] The treatment of existing stainless steel pickling wastewater basically adopts the methods of aeration, neutralization, and precipitation. Because the traditional method does not consider the recovery of heavy metals in wastewater, but only considers the treatment and discharge, the overall operating cost is too high, and the dried sewage Mud often causes secondary pollution by heavy metals due to improper disposal, and more importantly, it will cause waste of resources. A large amount of iron, chromium and nickel salts are contained in stainless steel acid wastewater. At present, enterprises generally treat acid wastewater to meet the discharge standards, and then discharge it. However, such discharge still has a lot of problems. First, the iron, chromium, and nickel salts in it form seco...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/74C02F1/66C02F1/56
Inventor 陈启松
Owner 陈宇青
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