With the need of economic development, China's rubber additives production enterprises are increasing day by day. However, because the production of rubber additives will bring a large amount of production wastewater, direct discharge will inevitably lead to serious environmental pollution.

Rubber additives production wastewater has the characteristics of high COD content, high salt content, and complex composition. There will be certain difficulties in wastewater treatment. This time I will focus on the optimization of the pretreatment process of rubber additives production wastewater.

Take a chemical plant that produces rubber additives such as vulcanizing agents, accelerators, and vulcanized resins as an example. The company has a large variety of products, high salt content in the production wastewater, complex components, and a large amount of benzene rings. It is difficult to treat waste water, and the corresponding production wastewater pretreatment process is unreasonable, and the normal operation of the biochemical system cannot be realized. As a result, the pretreatment of production wastewater cannot meet the national emission standards.

Therefore, optimization of related processes for the pretreatment of wastewater from the production of rubber additives has become an urgent problem to be solved.

Analysis of the source and water quality of waste water from the production of rubber additives.

Rubber additives companies have three production workshops with different product types. The components of the production wastewater in each workshop are different. The production wastewater in the first workshop is mainly reaction water and washing water, and the main pollutants are dimethylamine and chloride ions. The main pollution components of the production wastewater in the second workshop are pentachlorothiophenol, DMF, chloride ions, etc.; the main pollution components of the production wastewater in the third workshop are sodium o-aminothiophenol and chloride ions; the main pollution components of the production wastewater in the acyl chemical section are Benzoic acid and chloride ion.

From the characteristics of the production process of the rubber additive enterprise, it can be found that the amount of head water in the production wastewater is small and the concentration of pollutants is high, while the amount of washing water is large and the concentration of pollutants is low. In the pretreatment of the production wastewater, the process was not set up properly from the perspective of effective resource recovery, resulting in the mixed treatment of the head water and the washing water, which made the subsequent treatment effect not stable enough.

Optimization measures for pretreatment process of waste water from rubber additives production

1. Aiming at a large number of white floating objects in a workshop, the original pretreatment process adopted the method of manually salvaging the modified materials, which made the efficiency and effect of the treatment unsatisfactory, and it was necessary to waste a lot of water for ground washing.

Using pressure-dissolved air flotation method to optimize related processes can ensure that the quality of material recovery does not change without adding chemicals.

2. The production wastewater of the second workshop contains more DMF solvents and sulfides with recyclable value. Therefore, for the recovery of DMF, the relevant process adopts the method of extractive distillation to refine DMF, and applies activated carbon fiber for recycling and adsorption. For the recovery of sulfide, the method of adding alkali is adopted.

3. The COD and salt concentrations in the production wastewater of the third workshop are very high, and contain some floating oil and other suspended components. The optimization of the production wastewater process for the third workshop is mainly to use high-efficiency precipitators for floating oil and suspended components, thereby effectively reducing the risk of blockage of the subsequent evaporation system pipelines caused by suspended components in the wastewater, and greatly improving the working efficiency of the evaporation system.