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Characteristics of domestic wastewater and industrial wastewater


Because of the rapid development of industry, the amount of water and water pollution of industrial wastewater is very large. It is an important pollution source, and has the following characteristics:

(1) large amount of emission, wide pollution range, complex discharge mode, large amount of water used for industrial production, a considerable portion of production water carries raw materials, intermediate products, by-products and end products. Industrial enterprises throughout the country, a wide range of pollution, many products in use will produce new pollution. Such as the total fertilizer application amount of about 500 million T, about 2000000 tons of pesticides, so that all over the vast area of surface water and underground water are subject to varying degrees of pollution. Industrial wastewater has a complicated discharge mode, with intermittent emissions, continuous emissions, regular emissions and irregular emissions, which poses great difficulties for the prevention and control of pollution.

(2) many kinds of pollutants, the concentration fluctuation due to industrial product variety, production process is also different, therefore, the pollutants discharged in the industrial production process is beyond count of different pollutants have very different properties, the concentration, but also far away.

(3) pollution toxicity is strong, serious pollution of wastewater by acid-base irritating, corrosive, and oxygen-containing organic compounds such as aldehydes, ketones, ethers are reducing energy consumption, the dissolved oxygen in water, the water hypoxia caused death of aquatic organisms. Industrial wastewater contains large amounts of nitrogen, phosphorus, potassium and other nutrients, which can cause algae to grow in large quantities, consume dissolved oxygen in water, and cause eutrophication pollution of water bodies. The content of suspended solids in industrial wastewater is very high, up to 3000mg/L, 10 times as much as that of domestic wastewater.

(4) the law of migration and variation of pollutants after discharge is different; the nature of pollutants contained in industrial wastewater varies greatly, and some of them are more toxic, larger accumulation and higher stability. Once the discharge change laws are not the same, some sedimentary water, some volatile into the atmosphere, some enrichment in living organisms, some are transformed into other substances, or even cause two pollution, the pollution is more dangerous.

(5) recovery is difficult. Once the water body is polluted, it will take a long time to recover to the original state even if it reduces or stops the emission of pollutants. Sewage in the "dirty" must be "life" inseparable from the relationship. The wastewater produced in our life is usually flushing water, ordinary cleaning water, kitchen waste water, washing water (washing powder, washing powder and other detergent water). These processes determine the type and content of "waste" in our domestic wastewater, which is what you call "characteristics". BOD, COD, PH, Escherichia coli, SS, these are the items that must be monitored when domestic sewage treatment, then these are the main types of sewage in the sewage... Moreover, as living habits change, the type of sewage is changing. Previously, kitchen washing dishes are hand washing, and do not add things, so the kitchen wastewater is mainly grease, and now wash dishes are used detergent category, so the wastewater will add a large number of other organic substances. There is a reduction of nitrogen and phosphorus content, washing powder washing before taking in more phosphorus, resulting in eutrophication, so vigorously promote low nitrogen and phosphorus or nitrogen and phosphorus washing powder, the nitrogen and phosphorus content of washing wastewater in the reduced.