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Steel strip acid-pickling wastewater treatment method

A technology of pickling wastewater and treatment methods, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the complicated and troublesome wastewater treatment process, cumbersome treatment system, and is not suitable for general use To achieve the effect of improving the quality of sewage discharge, increasing the sedimentation velocity, and improving the efficiency of sewage treatment

Inactive Publication Date: 2019-06-07
ANHUI CHUJIANG SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stainless steel pickling wastewater treatment system of the present invention can treat the mixed-acid pickling wastewater and the sulfuric acid pickling wastewater separately, and can also treat them separately according to the actual production situation, which not only reduces environmental pollution, but also makes the wastewater resourceful. Solve the recycling problem of stainless steel pickling wastewater and reduce the production cost of the enterprise, but the treatment system is cumbersome and the wastewater treatment process is complicated and troublesome, so it is not suitable for general use

Method used

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  • Steel strip acid-pickling wastewater treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, a steel strip pickling wastewater treatment method has the following steps (such as figure 1 As shown in the flow chart):

[0035] Step 1: Collect the waste water after pickling the steel strip;

[0036] Step 2: First-level neutralization: After step 1, pass the wastewater into the first-level neutralization tank, add lye for neutralization, and pass in compressed air for aeration during this process, and use PH test paper to test the neutralization tank for at least 4 The pH of the water at different points. What needs to be explained here is that these 4 different points are the inlet positions of the lye. When the pH value reaches 7-8, stop adding the lye; the lye in this step 2 is hydrogen For the calcium oxide solution, first use the wet ball milling slurry preparation system to grind the calcium hydroxide with water to prepare the calcium hydroxide solution, and then transport the calcium hydroxide solution through the pipeline to the primary neutr...

Embodiment 2

[0048] The method for treating steel belt pickling wastewater in this embodiment is basically the same as in embodiment 1, except that the polymer flocculants in step 5 of this embodiment are PAC and PAM polymer flocculants, and the wastewater is The mass concentration of PAC is 0.05‰-0.06‰, the mass concentration of PAM is 0.004‰-0.005‰, and the ratio of the mass concentration of PAC to the mass concentration of PAM is 10:1.

[0049] In this embodiment, by adding PAC and PAM polymer flocculants, it can effectively absorb suspended particles of different types and different particle sizes in the wastewater, and improve the preliminary purification degree of wastewater; at the same time, by strictly controlling the PAC and PAM polymer flocculants The mass concentration and the ratio of the two mass concentrations effectively increase the sedimentation speed of suspended particles and accelerate the sedimentation of sludge, which in turn reduces the overall filtration time of the fi...

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Abstract

The invention discloses a steel strip acid-pickling wastewater treatment method, and belongs to the field of wastewater treatment. The steps of the method are as follows: the wastewater after steel strip acid-pickling is collected; first-order neutralization, aeration and second-order neutralization are successively carried out, then the wastewater is transferred to an inclined plate sedimentationtank, and a molecular coagulant is added through a pipeline mixer on a transfer pipeline during the transfer process; and then the wastewater is introduced into a concentration tank, the upper wateris directly introduced into a secondary neutralization tank, the rest of the wastewater and sludge are introduced into a filter press to press out the water, the sludge is discharged out, the pressurefiltered clean water is returned to the secondary neutralization tank to continue to circulate, the relatively turbid water is introduced into the sedimentation tank for further sedimentation, the precipitated wastewater is introduced into the concentration tank of the above step to continue to treat, and the clean water is introduced into a filtration box and discharged after filtration. According to the technical scheme, the sewage discharge standard can be improved, the sludge production amount can be reduced, the operation cost can be reduced by about 50%, the process is simple, the operation is easy for employees, and the input cost is low.

Description

Technical field [0001] The invention relates to the field of wastewater treatment, and more specifically, to a method for treating steel belt pickling wastewater. Background technique [0002] With the development of the steel industry, in the production process of the steel strip, it is necessary to use hydrochloric acid, sulfuric acid, nitric acid or mixed acids of different proportions on the surface of the steel strip to remove oxides, lubricating oil, etc. attached to the surface of the steel strip. After washing the steel strip, the pickling liquid attached to the surface must be washed with water, and the washing wastewater discharged from this is the pickling wastewater. Such wastewater has a low pH value, a high chemical oxygen demand, and is rich in ferrous salts, which does not meet the relevant national and industry discharge standards. If the steel pickling wastewater is not treated and utilized, it will not only cause environmental pollution, but also waste preciou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/16
Inventor 唐时葵王军王道路
Owner ANHUI CHUJIANG SPECIAL STEEL CO LTD