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In the application of stainless steel pickling wastewater technology at that time, there were many technical applications, including neutralization, ferric sulfate, dispersed dialysis-diaphragm electrolysis, iron oxide red ammonium sulfate method, wetland method, biological method, high temperature roasting method, thin film evaporation method and other methods, through combining the needs of practical engineering, from many aspects. The combination of all the elements of water equipment for growing food can achieve excellent technical results.
1. Brief description of the overall concept of stainless steel pickling wastewater technology
Overall Characteristics of 1.1 Stainless Steel Structure
In the application of some iron and steel technology at that time, no matter the construction of medical pure water equipment project or the folk project, it can present different characteristics, especially when the steel structure plan of power plant workshop with steel structure has more overall advantages, which can constitute unique advantages and characteristics. Firstly, the construction period of steel structure building is short and the capital cost is reduced accordingly; secondly, the fireproof performance of steel structure building is high and the function of anti-corrosion is relatively strong; thirdly, the quality of steel structure building is light, the intensity is high, the span is large; fourthly, the investment of steel structure building is low and the cost is substantial; fifthly, the steel structure building is easy to move, recycle pollution-free and environmental protection. Sixth, steel structure buildings are widely used in factory buildings, warehouses, restaurants, gymnasiums, large shopping malls, leisure and vacation places, etc., which can play an excellent practical effect.
2.2 Global Adaptability Analysis
In wastewater, alkali liquor or bauxite is accumulated to neutralize acidic wastewater. Sodium nitrate is produced by water equipment in biochemical industry. Sodium nitrate still has a certain solubility, so polyacrylamide flocculant is needed to make the metal ions collect and settle. Two-stage disposal is used to mix the sediment from the first disposal with a stirrer to destroy the balance between the accumulation and ions in the liquid phase. Then the sediment is reacted fully by the neutralizing tower, and the second-stage settlement is carried out to achieve better results. This method is suitable for the treatment of acidic wastewater with high nitric acid concentration.
2. Analyzing the technical application of stainless steel pickling wastewater treatment
2.1 Application of Steel Structures in Atmospheric Corrosion Environment
From the point of view of some technical characteristics at that time, especially in the disposal of steel structures, in order to give full play to the overall characteristics of steel structures, it is necessary to wrap around the general application of acid washing wastewater technology. Through cleaning some corrosive substances and corrosive gases, it is necessary to strengthen all aspects of treatment, and through. The overall use of technology, especially the use of some general technology development and application, to remove some of the impurities attached to the steel structure, reduce the overall impact on the steel structure, solve some of the problems. Therefore, in exploring the application of steel pickling wastewater technology, it is necessary to fully consider the atmospheric impact of steel structure in buildings and reduce the unhealthy elements. The useful disposal of steel structure has become an indispensable link. At the application level of specific technology, we can combine the advanced equipment at that time, summarize the modern technology, use the ion exchange resin acid blocking characteristic to adsorb the waste acid in the waste liquid on the resin, other metal salts pass smoothly, and then use pure water to analyze the resin to recover the acid. The use of ion exchange resin to adsorb strong acid and remove metal salts from the solution can achieve the purpose of resting acid and metal ions respectively, and participate in the later stage of wastewater purification equipment can reach zero discharge, which can greatly reduce the cost of wastewater discharge. This technology has a wide range of characteristics, such as wide applicability of equipment, concise operation, large disposal capacity, high cost performance (relative to membrane acid recovery equipment), can be selected according to water quality and water demand, high adjustable type can prevent waste of funds, long service life of equipment, low repair rate, regeneration at room temperature, low energy consumption; The whole equipment for acid recovery can reach zero emission characteristics. The scope of application is hydrometallurgy, acid-making, electroplating, car manufacturing and other mechanical processing work. Therefore, in the specific application, it is necessary to constitute a systematic technical summary analysis.
Ferric Sulfate Disposal of 2.2 Sulphuric Acid Washing Solution
In the treatment technology of ferric sulfate process, the characteristic of this method is that the iron in waste liquid can be reused. Therefore, researchers pay attention to it and gradually constitute a more sophisticated practical technology. Through the specific application of sulfuric acid washing solution ferric sulfate disposal method, very good results can be achieved, and has been put into production practice. Especially the concentration-filtration-natural crystallization method is also called iron filings method. First, the waste sulfuric acid liquid and iron filings are fully reacted in a reaction tank, then the solution is heated to 100 C for 2 hours, then the solution is heated and concentrated, and then cooled naturally, so that the ferrous sulfate crystals are separated out, and finally dried by a dryer. The method can recover low, medium and high grade ferrous sulfate from acid pickling wastewater for industrial, agricultural, pharmaceutical and chemical reagents. It has the advantages of simple operation, less investment and low cost, but only ferrous sulfate can be recovered, sulfuric acid can not be recovered, so the disposal can be small; the product quality is poor and the production cycle is long, which is suitable for small-scale production of township enterprises.
Application of 2.3 Steam Jet Vacuum Crystallization Method
The waste acid liquid is sprayed onto the burning flame with a high atomization efficiency nozzle to evaporate the water. Usually about 35% sulfuric acid and some FeSO4 H2O can be obtained. Its working principle is: through the steam ejector and condenser, the evaporator and the crystallizer adhere to a certain degree of vacuum. When the temperature is suitable for the passage period of the waste liquor, the water evaporates under adiabatic condition, then concentrates the waste liquor, reduces the temperature of the waste liquor, correspondingly reduces the solubility of ferrous sulfate, and increases its supersaturation. With the participation of sulfuric acid in the evaporator, the degree of supersaturation of ferrous sulfate is further advanced. In this case, ferrous sulfate crystallizes. The raw materials used in this method have high corrosion resistance, and are prone to secondary pollution or unstable operation and can not be produced normally. In addition, according to the concept of ecology, an on-line monitoring and control system is established. The drainage and sewage system strictly implements the principle of "rainwater and sewage diversion and sewage clearance diversion", and considers all the laboratories and monitoring equipment of itself. Together with this, an on-line monitoring network and a joint monitoring approach with environmental protection departments are established and perfected to advance environmental monitoring and water. In order to eliminate the appearance of illegal discharge and leakage discharge, ensure the stable and qualified discharge of sewage, and end the "win-win" of pollution management and economic and social.
3, conclusion
In the application of stainless steel pickling wastewater technology at that time, according to the needs of practice, the overall characteristics of the coiling project can be used to select the method of activating the collateral. Especially in the environment of all the analysis of Engineering environment, the application of various methods can be considered, and all the progress of coiling economic and social benefits can be achieved very well. Effect.
Author: Hangzhou Water Shield Technology Co., Ltd.
Website: http://www.zjhzsd.com/
Key words: pharmaceutical pure water equipment, chemical industry water equipment, food water equipment
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