The complex problem in the treatment of sulfuric acid containing wastewater with alkali is the scaling of calcium bicarbonate. After scaling, the pipeline may shrink, reduce exhaust volume, and become blocked. Calcium bicarbonate scale is a reddish brown, hard, high-density solid that is often mixed with sulfide scale. The reaction equation is as follows:

H2SO4+Ca (OH) 2CaSO4+2H2O

Various countries around the world have summarized many practical and feasible methods for cleaning scale, generally including physical and chemical methods. For scale layers with short production cycle time and loose materials, a more convenient and fast removal method is high-pressure water cleaning. For high-density and hard scale layers, mechanical equipment crushing method can be used to remove them. If physical methods are difficult to remove, organic chemical methods can be considered for removal. Common methods for cleaning organic chemical scale include sodium hydroxide solution, alkaline boiling acid pickling passivation method, and complexing agent method.

How to carry out drug delivery in acidic wastewater?

Acidic wastewater reducing agents include quicklime powder (CaO), calcium bicarbonate (Cacoa), potassium carbonate (Na2CO3), anhydrous aluminum chloride (NaOH), and calcium carbide discharged from pharmaceutical factories. Its main component is Ca (OH) 2], which can be used in moderate acidic wastewater according to local conditions.

Lime powder is a common reducing agent. Choosing lime powder can neutralize acidic wastewater with all concentration values, and Ca (OH) 2 has a cohesive effect on the residue of wastewater, which is beneficial for wastewater treatment. The lime powder dosing method generally adopts dry and wet dosing methods.

The dry feeding method is to immediately invest lime powder into the wastewater based on its acid content. In order to better ensure that lime powder can be uniformly fed into the pool, lime powder shaking machinery and equipment are generally installed, and after sedimentation, it enters the sedimentation tank to separate the residue and residue sedimentation. The dry casting method has simple machinery and equipment, but the response is incomplete, slow, and the mud volume is large, which is 1.4-1.5 times the standard deviation. Lime powder also needs to be crushed and screened, so it has high labor efficiency and natural environmental standard deviation.

The wet throwing method is to first eliminate the raw limestone in the elimination machine, and make a caustic soda solution with a concentration value of 10% to 20% and a breaking degree exceeding 2000mmol/L. It is pumped into the caustic soda solution storage tank for storage. When necessary for production and manufacturing, use a pump to pump the caustic soda solution into the reaction tank. Compared with the thousand throw method, the wet throw method has more machinery and equipment, but the wet throw method has a rapid and complete reaction, and less mud, only 1.05-1.10 times the standard deviation.

The treatment method for wastewater before biochemical treatment is generally called wastewater pretreatment, and the composition of the selected control components is called pretreatment processing technology. Biochemical wastewater treatment is low-cost, easy to operate, and operates smoothly. Generally, biochemical methods are used for industrial wastewater treatment. Little do they know that industrial production wastewater has a complex composition and contains many organic compounds that have inhibitory and harmful effects on microbial strains. Therefore, it is necessary to carry out the necessary pre-treatment process before the wastewater enters the biochemical solution. What are the goals and daily tasks for wastewater pretreatment?

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