Domestic sewage treatment process

Abstract

The invention provides a domestic sewage treatment process, comprising the following steps: (1), primarily filtering with a grille well; (2), primarily settling with a primary settling tank; (3), chemically oxidizing with a primary oxidation tank; (4), biochemically treating with a secondary oxidation tank; (5), flocculating and settling with a secondary settling tank; (6), filtering with fiber balls; (7), sterilizing in a fresh water tank. Sewage is first chemically oxidized with Fenton's reagent so that refractory organics in the sewage are decomposed, the sewage is then biologically treated in the secondary oxidation tank, organics and heavy metal ions in the biochemically treated sewage are further removed via flocculating, and the swage is finally filtered with the fiber balls and sterilized; sewage treatment efficiency is improved, outgoing water quality reaches the standard for reclaimed water, and outgoing water is directly reclaimable.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to a domestic sewage treatment process. Background technique [0002] Domestic sewage is mainly various detergents and sewage, garbage, feces, etc. used in life, mostly non-toxic inorganic salts. Domestic sewage contains many nitrogen, phosphorus, and sulfur, and many pathogenic bacteria. Domestic sewage contains a large amount of organic matter, such as cellulose, starch, sugars 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 high nitrogen, sulfur and phosphorus content, and it is difficult to deal with later. The existing domestic sewage treatment methods are mainly as follows: 1. Unpowered anaerobic engineering treatment mode: villages with flat terrain and a certain drop, through the un...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: based on the limitations of the anaerobic effect, the sewage treatment effect is very obvious for high-concentration domestic sewage, that is, the COD value is between 3000 and 30000; for low-concentration bottom domestic sewage, the COD value is between 100 and 300 The room efficiency is relatively low, and it is difficult for the effluent to meet the standard with a single treatment method

The disadvantage of this method is: for low-concentration domestic sewage in rural areas or communities, that is, sewage with a COD value between 100 and 300, the biochemical property is very good. After adopting dynamic aeration, the effluent can meet the discharge standard, but the power consumption is relatively large.

(Disadvantages: only the use of rural sewage, and the output of biogas must be very small, the production of biogas has not substantially improved the energy used in rural life, and the maintenance workload is large

The disadvantage of this is that the wetland or plant absorption is set after one of the above treatment methods to further absorb and degrade the pollutants in the water

Although this method successfully solves the problems of energy consumption and water quality discharge, the wetland covers a large area and the construction cost is high. The domestic sewage discharged by a natural village of 50 households occupies an area of ​​1200m2 2 Left and right; or adopt a three-dimensional multi-layer structure, although the land area is greatly reduced, but the follow-up brings huge civil engineering costs and complex structures

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