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Pretreatment technology of hot-galvanizing wastewater

A hot-dip galvanizing and pretreatment technology, applied in the removal of phosphate ions and solid particles, the pretreatment process of hot-dip galvanizing wastewater, and the field of zinc in wastewater, can solve problems that affect the production and life of residents and destroy ecological balance, and achieve Less equipment, lower organic load, and lower energy consumption

Inactive Publication Date: 2014-05-07
HANGZHOU SHUANGBO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of wastewater contains TP, zinc, COD and other pollution factors, especially the discharge of zinc ions and TP will have a long-term negative impact on the surrounding water bodies of the production enterprise, destroy the ecological balance, and seriously affect the production and life of local residents

Method used

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  • Pretreatment technology of hot-galvanizing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A hot-dip galvanized steel sheet production enterprise produces 150,000 tons of hot-dip galvanized steel sheets annually, and produces 315 tons of hot-dip galvanized wastewater per day. The wastewater quality indicators are shown in Table 1 below.

[0022] Unit: mg / L

[0023] water quality index

[0024] Table 1

[0025] After the hot-dip galvanizing wastewater is treated by the process of the present invention, the effluent water quality index is shown in Table 2 below after testing.

[0026] Unit: mg / L

[0027] water quality index

[0028] Table 2

Embodiment 2

[0030] A hot-dip galvanized steel sheet production enterprise produces 100,000 tons of hot-dip galvanized steel sheets annually, and produces 230 tons of hot-dip galvanized wastewater per day. The pollution factor indicators in the wastewater are shown in Table 3.

[0031] Unit: mg / L

[0032] water quality index

[0033] table 3

[0034] After using the process of the present invention to treat the hot-dip galvanizing wastewater, after analysis, the water quality index of the effluent is shown in Table 4.

[0035] Unit: mg / L

[0036] water quality index

[0037] Table 4

Embodiment 3

[0039] A hot-dip galvanized steel sheet production enterprise produces an average of 350 tons of hot-dip galvanizing wastewater per day, and the indicators of wastewater pollutants are shown in Table 5.

[0040] Unit: mg / L

[0041] water quality index

[0042] table 5

[0043] After the hot-dip galvanizing wastewater is treated by the process of the present invention, the water quality indicators of the effluent are shown in Table 6 after analysis.

[0044] Unit: mg / L

[0045] water quality index

[0046] Table 6

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Abstract

The invention discloses a pretreatment technology of hot-galvanizing wastewater. The pretreatment technology comprises the following steps: introducing the wastewater into a continuous reaction precipitation system, dosing, stirring, reacting, flocculating and precipitating; and carrying out further biochemical treatment on supernatant in a reaction tank, so that after meeting discharge standards, the supernatant is discharged, and concentrating sludge slurry at the lower part of the reaction tank so as to prepare sludge cakes, externally transporting the sludge cakes and treating. After the hot-galvanizing wastewater is treated by the pretreatment technology, zinc ions and phosphate radical ions meet the discharge standards, the COD (Chemical Oxygen Demand) value is substantially reduced, and the pressure of an organic load of a follow-up biochemical treatment system is greatly reduced; the pretreatment technology of the hot-galvanizing wastewater is high-efficiency, reliable, economic and practical.

Description

technical field [0001] The invention relates to a pretreatment process for hot-dip galvanizing wastewater, in particular to a method for removing zinc, phosphate ions and solid particles in wastewater, and belongs to the field of sewage treatment. Background technique [0002] Hot-dip galvanized steel sheets are widely used in construction, home appliances, vehicles and ships, container manufacturing, electromechanical industries, etc., almost involving all fields of food, clothing, housing and transportation. In recent years, the demand for hot-dip galvanized steel sheets in the world has continued to increase, and the output has also increased rapidly. In major steel producing countries such as the United States and Japan, the proportion of hot-dip galvanized steel sheets in steel products has reached 13%-15%. With the development of China's domestic economy, especially the development of automobiles, home appliances and construction industries, the demand for hot-dip galv...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
Inventor 赵伟荣冯文杰
Owner HANGZHOU SHUANGBO ENVIRONMENTAL PROTECTION TECH
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