Suggest collection! Understand the process flow of various wastewater treatment technologies.

The wastewater treatment method is to treat wastewater by physical, chemical and biological methods, so as to achieve the purpose of purifying wastewater, reducing pollution, recycling wastewater and making full use of water resources. Illustration 17 detailed flow charts of sewage treatment processes, recommended for collection! We should focus on solving the sewage treatment problem of small and medium-sized enterprises.

process flow diagram

1. Electroplating wastewater: Electroplating wastewater mainly comes from electroplating production process, and a large amount of industrial wastewater will be discharged. The discharge and nature of wastewater are closely related to the production mode and water use mode of electroplating industry. According to the different treatment methods, electroplating wastewater can be divided into four categories, namely pretreatment wastewater before plating, plating liquid waste, rinsing wastewater of plating and "running, running, dripping and leaking" in the production process.

2. Starch wastewater: Starch wastewater is the wastewater generated from the production of starch or starch deep-processed products (starch sugar, glucose, starch derivatives, etc.). Corn, potato, wheat, rice and other agricultural products are used as raw materials, which are generally high-concentration organic wastewater and are one of the main sources of environmental pollution.

3. Juice production wastewater: Juice wastewater mainly comes from fruit cleaning, crushing, juicing and other processes, bottle washing, sterilization, bottle breaking and grinding in the canning section. The wastewater contains high concentration of sugar, pectin, pomace, water-soluble substances, cellulose, fruit acid, tannin, mineral salts and so on. There are some differences in different seasons, and the organic content of juice wastewater is also at the peak at peak flow.

4. Lead-containing wastewater: At present, there are many mature and reliable technologies for treating lead-containing wastewater, such as ion exchange, precipitation, adsorption, electrolysis and their combinations.

5. Synthetic leather processing wastewater: In the process of recovering dimethylformamide (DMF), synthetic leather and artificial leather industries will produce wastewater containing DMF.

6. Chemical wastewater: Pure water has changed its original physical or chemical properties after use, becoming wastewater containing different kinds of impurities. Chemical wastewater refers to process wastewater, cooling water, waste gas washing water, equipment and site washing water discharged in chemical production. If these wastewater are discharged without treatment, it will cause pollution of different properties and degrees to the water body, thus endangering human health and affecting industrial and agricultural production.

7. Chemical fiber wastewater: Chemical fiber wastewater refers to all kinds of wastewater generated during chemical fiber production, such as PET wastewater, PTA wastewater, cotton pulp black liquor, viscose wastewater, etc.

8. Coking wastewater: Coking wastewater is a typical toxic and refractory organic wastewater. It mainly comes from the production water and steam condensation wastewater during the initial cooling of coke oven gas and coking production. Refers to the wastewater generated in the process of coal coking, gas purification, chemical product recovery and chemical product refining.

9. Alcohol production wastewater: Alcohol wastewater is an organic wastewater with high concentration, high temperature and high suspended solids. Water pollution is the most serious in the alcohol industry. The wastewater in the production process mainly comes from the distiller's grains discharged after distillation and fermentation of mature mash, the washing water of production equipment and the cooling water during cooking, saccharification, fermentation and distillation.

10. Landfill leachate wastewater: Landfill leachate refers to a kind of high-concentration organic wastewater generated by the water contained in the garbage in the landfill, the water such as rain and snow entering the landfill, and the saturated water holding capacity of the garbage and the covering layer is deducted.

1 1. Phosphating wastewater: Phosphating wastewater is the pretreatment of metal surface treatment, which generally includes degreasing and rust removal, surface adjustment and phosphating passivation. There are simple phosphating, that is, phosphoric acid, sulfuric acid and nitric acid, and there are also special phosphating agents (water agent and powder products) with high requirements, and powder products produce more mud. Spraying includes powder spraying and spray painting. If it is powder spraying, the discharged wastewater is pretreatment wastewater including phosphating wastewater.

12. Pesticide wastewater: Pesticide wastewater refers to the wastewater discharged during the production of pesticides in pesticide plant. The quality and quantity of wastewater are unstable. Mainly divided into: benzene-containing wastewater, organophosphorus wastewater, high-concentration saline wastewater, high-concentration phenol-containing wastewater and mercury-containing wastewater.

13. Brewery wastewater: Brewery wastewater refers to the wastewater discharged during beer production. It is the main pollution source of brewery.

14. Domestic sewage: The pollutants contained in domestic sewage are mainly organic substances (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc. ) and a large number of pathogenic microorganisms (such as parasitic eggs and intestinal infectious viruses). ). The organic matter existing in domestic sewage is extremely unstable, and it is easy to rot and produce stench. Bacteria and pathogens feed on organic matter in domestic sewage and multiply in large quantities, which can lead to the spread of infectious diseases. Therefore, domestic sewage must be treated before it can be discharged.

15. printing and dyeing wastewater: printing and dyeing wastewater is the wastewater discharged from printing and dyeing factories which mainly process cotton, hemp, chemical fiber and their blended products. The amount of printing and dyeing wastewater is large, and each printing and dyeing process consumes 100~200 tons of water, of which 80~90% becomes wastewater. Textile printing and dyeing wastewater is one of the most difficult industrial wastewater because of its large amount of water, high content of organic pollutants, high alkalinity and great change in water quality. Wastewater contains dyes, sizing agents, auxiliaries, oil agents, acid and alkali, fiber impurities, sand substances, inorganic salts and so on.

16. pharmaceutical wastewater: pharmaceutical industrial wastewater mainly includes four categories: wastewater from antibiotic production, wastewater from synthetic drug production, wastewater from Chinese patent medicine production, and washing water and washing wastewater during the production of various preparations. Its wastewater has the characteristics of complex composition, high organic content, high toxicity, deep chroma and high salt content, especially poor biodegradability, and intermittent discharge, which is difficult to treat.

17. Slaughtering wastewater: Slaughtering wastewater comes from washing, draining, scalding, dissection, non-staple food processing, animal residues, blood, etc. There are a lot of ammonia nitrogen in the feces left in animals and the blood produced during slaughter. If it is not treated, it will seep into the ground or flow into rivers, which will naturally destroy the water on which human beings depend, thus causing the growth of cyanobacteria and the massive death of fish and shrimp in the water.

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