Method for treating stainless steel acid-mixed wastewater

Abstract

The invention discloses a method for treating stainless steel acid-mixed wastewater. The method comprises the following steps: step 1, carrying out pretreatment, filtering the waste water through an automatic microfilter to remove the particles; step 2, separating and concentrating the pretreated waste water through a charged membrane to separate and concentrate acid radicals, fluorine ions, nitrate ions and iron ions in the acid-mixed waste water; step 3, incinerating the remaining waste water at high temperature, and finally converting the waste water into regenerated acid and iron oxide powder through high temperature incineration. The treatment method of the stainless steel acid-mixed waste water provided by the invention can recover most of the fluorine ions, nitrate ions and iron ions before treating the mixed acid waste water, and is of great significance to the reduction of the treatment cost of subsequent medicament neutralization and defluorination, sludge reduction and denitrification treatment, and the improvement of the environmental capacity.

Description

technical field [0001] The invention relates to the technical field of AGV vehicles, in particular to a vehicle multi-rudder wheel system and a cooperative control method under the condition of medium and large loads. Background technique [0002] At present, in the production process of stainless steel products in domestic stainless steel companies, the purchased stainless steel raw materials need to be pretreated, and mixed acid pickling is one of the important pretreatment processes. After pickling with mixed acid, the steel plate needs to be rinsed with clean water before it can enter the subsequent treatment. During this period, a large amount of mixed acid pickling wastewater will be generated; take a stainless steel factory as an example: the average daily discharge is 50m3 / h. Its water quality is as follows: [0003] project Design water volume pH Me NO3- F- Conductivity unit t / h No stiffness mg / L mg / L mg / L μS / cm raw water ...

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Problems solved by technology

[0008] 1) The consumption of chemicals is large: lime and liquid caustic soda are used as neutralizers, and the consumption is huge; the cost of chemicals is high; the discharged wastewater contains a lot of salt

[0009] 2) A large amount of sludge is generated: because the wastewater contains a large amount of fluoride ions and iron ions, a large amount of calcium fluoride sludge and iron hydroxide heavy metal sludge will be formed, and the sludge disposal cost is high

[0010] 3) Since the waste water contains a large amount of nitrate ions, the total nitrogen discharged into the denitrification system can reach more than 1500mg / L, causing a huge load on the subsequent denitrification, and the cost of denitrification is high

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