Urban domestic sewage treatment technique

Abstract

The invention discloses an urban domestic sewage treatment technique. Two groups of grilles having different pore diameters are used to filter sewage first; precipitating and anaerobic reaction are carried out to release phosphorus for ammoniating, so that it is convenient for a reaction tank to remove nitrogen and phosphorus of the sewage; a Carrousel oxidation ditch reaction tank removes nitrogen and phosphorus of the sewage, and the sewage is disinfected by ultraviolet lamps before discharging; waste gas generated by the Carrousel oxidation ditch reaction tank is subjected to air purification so that air pollution can be decreased; an MBR (membrane bioreactor) disinfects the treated water in two different groups of manners after nitrogen and phosphorus removal, and the treated water canbe used as tap water or be directly used; sewage treatment effect and quality are improved. In addition, sludge from sewage treatment is applied to agriculture after metal extraction and dewatering.The urban domestic sewage treatment technique has the advantages that resource waste can be decreased, secondary pollution can be avoided, energy is saved, environment is protected, the technical pathis short, the cost is low, and the technique is convenient to perform, has multiple functions, is widely applicable and good in safety and stability, and is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a process for treating urban domestic sewage. Background technique [0002] Municipal sewage includes domestic sewage, industrial wastewater and runoff sewage within urban areas. Domestic sewage is mainly the discharge water produced by various kitchen water, washing water and toilet water used in human life, mostly non-toxic inorganic salts. Domestic sewage also contains a large amount of organic matter, such as cellulose, starch, carbohydrates and fatty proteins; it also often contains pathogenic bacteria, viruses and parasite eggs; inorganic salts such as chloride, sulfate, phosphate, bicarbonate and sodium , potassium, calcium, magnesium, etc. The general feature is that it contains high nitrogen and phosphorus content, and is prone to odorous substances under the action of anaerobic bacteria. At present, most cities have sewage treatment points to...

AI Technical Summary

Problems solved by technology

However, due to precipitation and chemical reactions in the process of domestic sewage treatment, a large amount of solid impurities will be produced, and these solid impurities will settle down, resulting in a large amount of sludge

The sludge contains a large amount of organic matter and nitrogen, phosphorus and potassium elements, and the COD value is too high, which is far from meeting the national emission standards