Treatment method of secondary wastewater of kitchen waste

Abstract

The invention discloses a treatment method of secondary wastewater of kitchen waste. The treatment method comprises the following steps of: (1) carrying out materialization pretreatment on kitchen wastewater to remove floater, animal or vegetable butter, oil and SS (suspended matter) in the wastewater; (2) carrying out the two-stage hydrolysis acidification-IC (internal circulation) anaerobic reaction treatment and biochemical treatment of an aerobiont separation bed on the wastewater; and (3) carrying out flocculation and precipitation on the biochemically-treated wastewater to discharge, and concentrating, dewatering and drying precipitate. The wastewater discharged by using the method reaches The people's Republic of China national standard of sewage comprehensive discharge standard (third-level discharge standard); through two-stage hydrolysis acidification-IC anaerobic reaction treatment, the gross removing rate of CODcr (chemical oxygen demand) can reach more than 92%, and carbon source does not needed to be supplied in the midway of the reaction, so that the normal running of equipment can be guaranteed.

Description

technical field [0001] The invention relates to a treatment method for secondary waste water from kitchen waste, and belongs to the technical field of environmental protection. Background technique [0002] Kitchen waste is the domestic waste formed by residents in the process of living consumption. It is easy to rot and deteriorate, emits foul smell, and spreads bacteria and viruses. The main components of food waste include rice, flour, food residues, vegetables, animal and vegetable oils, meat and bones, etc. From the chemical composition, there are starch, cellulose, protein, lipids and inorganic salts. In recent years, food waste has caused various food safety problems such as "gutter oil" and "swill pigs", so the treatment of food waste has attracted social attention. [0003] The treatment methods of food waste have gradually shifted from traditional sanitary landfill to drying treatment, wet heat treatment, and separated solid-liquid two-phase anaerobic digestion pr...

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Problems solved by technology

[0007] (3) Anaerobic reactors, such as the three-phase separator in the upflow sludge reactor bed (UASB), have no effect on the separation of mud, water, and gas, and the volume load is low, and the mass transfer effect is not very good. ;

[0008] (4) When the traditional two-stage anaerobic reactors are used in series, the biodegradability of the water after the first-stage anaerobic reaction treatment is greatly reduced, which affects the lower-stage anaerobic digestion reaction, and the carbon source needs to be supplemented

In addition, the secondary wastewater from kitchen waste treatment contains high concentrations of ammonia nitrogen, TN, and TP. Traditional techniques such as A 2 / O denitrification and phosphorus removal will produce a large amount of sludge, which increases the cost of subsequent treatment

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