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Method for treating leveling waste liquor

A waste liquid leveling technology, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of no effective treatment process for leveling waste liquid, high power consumption, and easy deactivation of catalysts. Achieve good environmental and social benefits

Active Publication Date: 2011-07-20
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses nitric acid + coagulation and demulsification, which increases the nitrogen content in water and causes secondary pollution. Moreover, the electrocatalytic oxidation process has the disadvantages of easy catalyst deactivation and high power consumption, so it is rarely used in practice.
[0006] So far, there is no effective treatment process for leveling waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use ferrous sulfate as coagulant, dosage 6000mg / L, use coagulant PAM as coagulation aid, dosage 3mg / L, mixing time 0.5min, reaction 10min, precipitation 0.5h; dilute with aerobic effluent , the COD of the influent in the hydrolysis and acidification stage is controlled at about 1000mg / L, and the hydraulic retention time is 12h; the hydraulic retention time of the membrane bioreactor is 48h. The removal effect of pollutants is shown in Table 1:

[0027] The removal effect of pollutant in table 1 embodiment 1

[0028]

Embodiment 2

[0030] Ferrous sulfate is used as coagulant, the dosage is 8000mg / L, the mixing time is 2min, the reaction time is 20min, and the precipitation time is 2h; it is diluted with aerobic effluent, and the COD of the influent in the hydrolysis and acidification stage is controlled at about 1500mg / L. The residence time is 18h; the hydraulic retention time of the membrane bioreactor is 36h. The removal effect of pollutants is shown in Table 2:

[0031] The removal effect of pollutant in table 2 embodiment 2

[0032]

Embodiment 3

[0034] Polyferric sulfate is used as coagulant, the dosage is 7000mg / L, the mixing time is 1min, the dosage of PAM is 0.5mg / L, the reaction time is 15min, and the precipitation time is 1h; dilute with aerobic effluent to dilute the influent in the hydrolysis and acidification stage The COD is controlled at about 1500mg / L, and the hydraulic retention time is 18h; the hydraulic retention time of the membrane bioreactor is 36h, and the removal effect of pollutants is shown in Table 3:

[0035] The removal effect of pollutant in the embodiment 3 of table 3

[0036]

[0037] COD removal rate at this stage (%)

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PUM

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Abstract

The invention provides a method for treating leveling waste liquor. The method comprises the following steps of: (1) adding 6,000 to 8,000mg of iron salt into each liter of leveling waste liquor, rapidly mixing for 0.5 to 2 minutes to fully mix the iron salt and the waste liquor, reacting for 10 to 30 minutes, settling for 0.5 to 2 hours, and performing solid-liquid separation; (2) diluting effluent obtain in the step (1) until the chemical oxygen demand (COD) of the effluent is 1,000 to 2,000mg / L, and adding the effluent into a hydrolytic acidification reactor with the hydraulic retention time of 12 to 24 hours; and (3) adding the effluent obtained in the step (2) into an oxic membrane bioreactor with the hydraulic retention time of 24 to 48 hours. The leveling waste liquor is treated bythe method, so that the effluent after the treatment can reach the national emission standard, the problem of treatment of the leveling waste liquor is effectively solved, a novel process for treating the leveling waste liquor is opened up, and the method has good environmental and social benefits.

Description

technical field [0001] The invention relates to the field of environmental protection and resource utilization, in particular, the invention relates to a method for treating leveling waste liquid. Background technique [0002] The production process of cold-rolled steel plate generally includes five processes of pickling, rolling, annealing, leveling and finishing. Tempering is a cold finish rolling process with a reduction rate of 0.3 to 3.3% after recrystallization annealing, and is divided into two types: dry leveling and wet leveling. In the past, dry leveling was mostly used. Since the 1970s, in order to improve the anti-rust ability and improve the quality of strip steel, water-soluble or oil-soluble anti-rust agents have been widely used as leveling liquid to spray the roll gap for wet leveling. [0003] Leveling liquid is an important medium used in the wet leveling process, which is divided into two categories: inorganic leveling liquid (nitrite type) and organic t...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F103/16
Inventor 侯红娟李恩超戴竞舸李山青黄业钢刘镜清
Owner BAOSHAN IRON & STEEL CO LTD
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