Steel drum production wastewater treatment method and facility

In the production process of steel drums, the surface degreasing treatment, phosphating treatment, and the cleaning of old steel drums before the surface coating process will produce a large amount of industrial wastewater. These wastewaters are typical acidic wastewater and alkaline wastewater in industrial wastewater. If these wastewaters are directly discharged, they will corrode pipe channels, damage crops, harm aquatic organisms such as fish, endanger human health, and destroy the normal operation of biological treatment systems. Handle it properly.

Generally, the treatment methods for acid and alkali industrial wastewater are: high-concentration acid and alkali wastewater (acid and alkali content above 3%~5%), should first consider recycling and comprehensive utilization; low concentration acid and alkali wastewater When recycling or comprehensive utilization is of little significance, neutralization should be carried out before discharge to restore the pH to a certain range near neutral (pH 5~9). Steel drum production wastewater is a low-concentration wastewater, which is generally treated by neutralization.

First, the processing technology and method

The process of using a chemical agent to bring the pH of the wastewater to a neutral state is called neutralization treatment. The commonly used neutralization treatment methods are as follows.

1. Comprehensive method for acid and alkali wastewater

This is a simple and economical method of waste disposal. In this method, acid and alkali wastewater are jointly introduced into the neutralization tank and mixed and stirred. The volume of the neutralization tank should be considered in terms of the amount of wastewater from 1.5 to 2.0 hours.

This method is suitable for the case where both the alkaline water and the acidic water are generated in the waste water produced during the production, for example, the pickling and rust removing and the alkali washing and removing oil in the treatment before the new steel drum is coated. The wastewater generated by the various processes can be used for the benefit of waste treatment.

2. Pharmacy neutralization method

Neutralizing agents for acidic wastewater include lime, caustic soda, sodium carbonate, limestone, carbide slag, boiler ash and softening station slag; and the neutralizing agents for alkaline wastewater include sulfuric acid, hydrochloric acid and acid waste gas. The dosage of the neutralizing agent is determined by the experimentally determined pH of the wastewater.

Lime is the most commonly used neutralizer for acidic water. It not only neutralizes any concentration of acidic wastewater, but also produces calcium hydroxide. The method of adding lime is to invest in wet and wet. The dry casting method is to uniformly add the pulverized quicklime directly into the water. The wet casting method is to dissolve the quicklime into a Ca(OH)2 emulsion of 5% to 10% after being digested into a concentration of 40% to 50% in a digestion tank, and to add water. mixing. Mixing and reaction are done in one pool.

3. Filtering neutralization method

The method of using limestone and marble (CaCO2) as a filter material to pass acidic wastewater through the filter layer and making the water in the water is called a filter neutralization tank and a drum neutralization tank.

The choice of filter material is closely related to the solubility of the neutralized product. The neutralization reaction of the filter material occurs on the surface of the particle. If the solubility of the neutralized product is small, an insoluble hard shell is formed on the surface of the filter particle to prevent the neutralization reaction from continuing, and the neutralization reaction fails. Therefore, according to the composition and treatment amount of the treated acidic wastewater, the filter material and the filter structure can be appropriately selected to achieve the best treatment effect.

Second, wastewater treatment facilities

The neutralization method is used to treat the steel drum production wastewater. The built facilities are the simplest, and do not require complicated equipment or much investment.

1. Measurement of acidity and alkalinity of wastewater

The simplest method is to use measuring pH paper dip in the water, degree of color change was observed in the paper, both determined pH wastewater. Generally, it is not necessary to measure too accurately, as long as the wastewater is treated and then measured with a pH test paper, and the pH can be discharged when it reaches 5 to 9.

2, treatment of drugs

According to the unused wastewater acid, alkali type and different treatment methods, different treatment agents are selected. The selection principle is as cheap as possible to reduce the treatment cost.

3. Wastewater treatment tank

For the acid and alkali wastewater neutralization method and the chemical neutralization method, in general, as long as a brick cement pool is built outside the workshop, the wastewater is introduced into the tank for treatment, and the treatment can be discharged after the requirements are met. The pool can be built below the ground level or built on the ground level. It is also convenient to maintain. Because of the long time, the sediment in the pool increases and needs to be cleaned.

For the filtration neutralization method, it is also necessary to build a pool. It is only necessary to install the filter material in the net frame, and place the net frame in the pool to block the water inlet and the water outlet, so that the waste water can be directly discharged through the filter material.

The size of the pond depends on the amount of wastewater. Under normal circumstances, it should be possible to install the wastewater generated within 2 hours.

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