Treatment methods and facilities of the hottest st

Treatment methods and facilities of steel barrel production wastewater

in the process of steel barrel production, the thigh bones of adults and the elderly may need several months to recover. Before surface coating treatment, surface oil removal and rust removal treatment, phosphating treatment, and the production of old steel barrel refurbished cleaning barrels will produce a large amount of industrial wastewater. These wastewater are typical acidic wastewater and alkaline wastewater in industrial wastewater. If these wastewater is directly discharged, it will corrode pipes and canals, damage crops, harm aquatic organisms such as fish, endanger human health, and damage the normal operation of biological treatment system. Therefore, it must be properly treated. Generally, the treatment method of acid and alkali industrial wastewater is: for acid and alkali wastewater with high concentration (containing more than 3%~5% acid and alkali), recycling and comprehensive utilization should be considered first; When the recovery or comprehensive utilization of low concentration acid and alkali wastewater is of little significance, neutralization treatment should be carried out before discharge to restore the pH value to a certain range near neutral (pH 5-9). Steel barrel production wastewater belongs to low concentration wastewater, which is generally treated by neutralization method. 1、 Treatment process and method the process of using chemical agents to make the pH value of wastewater reach about neutral is called neutralization treatment. Common neutralization methods are as follows. 1. The comprehensive method of acid and alkali wastewater is a simple and economical method of treating waste with waste. This method is to introduce acid and alkali wastewater into the neutralization tank and mix and stir. The volume of neutralization tank shall be considered as 1.5~2.0h of wastewater. This method is applicable to the situation that there are both alkaline water and acidic water in the wastewater generated during production. For example, in the pretreatment of new steel barrel coating, there are two processes of acid pickling and rust removal and alkaline washing and oil removal. The wastewater generated by these two processes can be used for medium benefit, and the effect of waste treatment is also very good. 2. The neutralizing agents of the acid wastewater of the reagent neutralization method include lime, caustic soda, sodium carbonate, limestone, carbide slag, boiler ash and waste slag of the softening station, etc; Neutralizing agents for alkaline wastewater include sulfuric acid, hydrochloric acid and acid waste gas. The dosage of neutralizing agent is determined according to the pH of wastewater measured by experiment and is also of great significance in safety work. Lime is the most commonly used neutralizer for acidic water. It can not only neutralize acidic wastewater of any concentration, but also produce calcium hydroxide with coagulation. Lime can be added in two ways: wet and wet. The dry dosing method is to evenly add the crushed quicklime directly into the water, and the wet dosing method is to digest the quicklime into a concentration of 40% - 50% in the digestion tank, then acid it into a Ca (OH) 2 lotion of 5% - 10%, and add it to the water for mixing. Mixing and reaction are completed in one pool. 3. The filtration neutralization method uses limestone and marble (Caco2) as filter materials to let acidic wastewater pass through the filter layer, and the method of mixing water is called filtration neutralization tank and drum neutralization tank. The selection of filter material is closely related to the solubility of neutralization products. The neutralization reaction of the filter material takes place on the surface of the particles. If the solubility of the neutralization product is very small, an insoluble hard shell will be formed on the surface of the filter material particles to prevent the continuation of the neutralization reaction and make the neutralization reaction treatment fail. Therefore, according to the composition and treatment capacity of acid wastewater, the filter material and filter structure can be appropriately selected to achieve the best treatment effect. 2、 The wastewater treatment facility adopts neutralization method to treat steel barrel production wastewater. The construction is the simplest, which requires neither complex equipment nor too much investment. Why does the metal impact testing machine vibrate when loading because of the material? What causes the pointer of the metal impact testing machine to shake? Now please follow me to have a look. High density 1. Measurement of acid and alkalinity of wastewater. The simplest measurement method is to dip pH test paper in water and observe the color change of the test paper, which can judge the pH of wastewater. Generally, there is no need for too accurate measurement. As long as the wastewater is treated and measured with pH test paper, it can be discharged when the pH value reaches 5~9. 2. Different treatment agents are selected according to the types of waste water acids and alkalis that are not used and different treatment methods. The selection principle is to be as cheap as possible to reduce the treatment cost. 3. Wastewater treatment tank for acid and alkali wastewater and reagent neutralization method, generally, as long as a brick cement tank is built outside the workshop, the wastewater is introduced into the tank for treatment, and discharged after the treatment meets the requirements. The pond can be built below or above the ground level, and it is also convenient for maintenance, because after a long time, the sediment in the pond increases, and it needs to be cleaned. For the filtration neutralization method, it is also necessary to build a pool, just put the filter material in the frame, place the frame in the pool, block the water inlet and outlet, and make the wastewater flow out directly after filtering through the filter material. The size of the pool depends on the amount of waste water. Generally, it should be able to hold the waste water generated for 2 hours