Characteristics and Treatment Technology of Fine Chemical Wastewater

The wastewater discharged from the fine chemical industry is different from the wastewater discharged from ordinary pollution. The wastewater discharged from the fine chemical industry is more harmful to the environment. At the same time, due to the development of chemical technology, the pollution standard of wastewater is getting higher and higher, and the harm to the environment is increasing.

How to deal with the wastewater discharged from the fine chemical industry has become an urgent problem to be solved.

Classification and characteristics of fine chemical wastewater

(1) Types of fine chemical wastewater

First, process wastewater.

In the production process of fine chemicals, most of the wastewater is in the form of process wastewater, which is harmful wastewater generated in the production process of fine chemicals.

The reasons for the production of process wastewater are complex and diverse, mainly from the discharge of water in the production process, the changes in water quality caused by chemical reactions, and the water pollution in the production raw materials due to the influence of chemical factors in the production process. process wastewater.

The chemical elements of process wastewater are diverse and the composition is complex, resulting in extremely strong pollution and toxicity of process wastewater. Once discharged, the damage to the environment is unimaginable.

Second, production and operation wastewater. This kind of waste water is mainly caused by the processing of raw materials by steam equipment in fine chemicals. The production and operation of wastewater not only has a huge impact on the environment, but also damages the machinery of fine chemical production, causing the machinery to rust and wear, and endanger the safety of the production process.

Third, flush the waste water. The source of this waste water is the waste water produced by the pouring of water raw materials and the combination of chemical raw materials caused by the machine during the production process.

Since it is wastewater produced with chemical raw materials, there are a lot of harmful substances in the composition, and the discharge of this wastewater will greatly damage the environment.

The generation of this kind of waste water is actually caused by the wrong method and means in the production process, and it is a kind of waste water that can be avoided.

Fourth, washing wastewater. The source of this waste water is the waste water generated from the cleaning of mechanical equipment, chemical products, and operating tools.

Compared with the previous types of waste water, this kind of waste water is not so harmful, but because there are too many items to be cleaned, the amount of this type of waste water produced is much higher than that of the previous types of waste water, which is also difficult to treat. one of the biggest reasons.

Fifth, the generation of other waste water.

For example, during the operation of chemical equipment, the temperature of the equipment is too high, and the cooling water generated by cooling the equipment needs to be cooled. This waste water has less pollution and can be reused, so the harm is relatively small.

There are also waste water pollution and secondary pollution caused by equipment leakage, which are generally rare, so the harm is relatively small.

(2) Characteristics of fine chemical wastewater

Due to the influence of chemical raw materials, one of the characteristics of fine chemical wastewater is that the composition of the composition is complex. The complex production process of chemical products leads to the mixing of water resources directly involved in the operation of chemical products with chemical products, which ultimately leads to the production of wastewater.

The second is the pollution. The concentration of pollutants contained in the wastewater is high, and the wastewater directly participates in the production activities, and there is no indirect generation of wastewater.

Refractory, chemically polluted products all have this feature, especially the pollution of water and soil by man-made chemical products is an irreversible process. Finally, there are many harmful substances, which have great harm to the environment and the human body.

Analysis of fine chemical wastewater treatment technology

(1) Bioinhibitory degradation technology

In the treatment of chemical wastewater, the toxic substances of chemical products have a strong inhibitory effect on the biochemical process, which increases the difficulty of comprehensive wastewater treatment.

Some chemical production processes must rely on high dilution of wastewater to dilute toxic substances, but the effect is often unsatisfactory.

Biodegradation inhibition technology selectively removes harmful toxic substances through the steps of adsorption, oxidation and separation of toxic substances, retains degradable toxic substances, and improves the degradability of wastewater.

(2) Anaerobic treatment method

Through the biological action and chemical reaction of the microorganisms existing in the toxic substances, the toxic organic substances in the wastewater are replaced with inorganic substances and various water, biogas and other substances, so as to treat the wastewater and improve the recycling rate of the wastewater. efficiency of use.

This process has two stages, one is acid fermentation and the other is alkaline fermentation. Acidic fermentation conducts bacterial fermentation of organic substances in wastewater, so that the substances in wastewater undergo chemical reactions of hydrolysis and fermentation, and finally form acidic substances and fermented substances.

Alkaline fermentation converts the substances formed in the first stage into gases such as carbon dioxide, thus completing the treatment of wastewater, and at the same time, the treated wastewater can also be recycled.

Analysis of fine chemical wastewater control methods

(1) Improve the treatment technology level and optimize the treatment process flow

In the production stage, improve the processing technology in the production process of chemical products.

First, do a good job in the cleaning process in the chemical production process to avoid the generation of flushing wastewater and a large amount of other wastewater caused by the pouring of water in the chemical production process.

Secondly, in the production process of chemical products, it is necessary to improve the production technology and optimize the production process. Advanced technology can reduce the generation of waste water and relieve the pressure of waste water pollution control;

The optimization of the production process can cooperate with the technology to control the production of waste water, so as to reduce the control of the production of waste water and reduce the discharge of waste water.

(2) Institutionalization and standardization of wastewater treatment

Promoting the standardization of wastewater treatment technology and the institutionalization of wastewater treatment methods and management is conducive to the long-term development of wastewater treatment.

The government should urge and supervise the standardized development of the wastewater treatment industry, establish a sound system for wastewater treatment, supervision and punishment, and do a good job in the supervision and management of wastewater treatment.

Institutionalized wastewater treatment is conducive to the long-term role of wastewater treatment supervision and governance.

Conclusion

The production factors of waste water in fine chemical industry are complex, and the difficulty of treatment varies with the pollution degree of waste water of chemical products. The variety of waste water also increases the difficulty of waste water treatment.

In terms of treatment methods, the biological inhibition method in biological treatment and the anaerobic treatment method in chemical treatment are mainly studied.

In terms of control, it should be optimized on the progress of the government and technology, as well as promote the standardization and institutionalization of wastewater treatment, and provide institutional governance for wastewater treatment.

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