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Treatment method of secondary wastewater of kitchen waste

A food waste and treatment method technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of affecting the lower-level anaerobic digestion reaction and the mass transfer effect is not very good , Separation effect is not increased, etc., to achieve the effect of reducing daily operation and management costs, reducing daily maintenance, and occupying a small area

Active Publication Date: 2012-07-25
JIANGSU ZHAOSHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Embodiment

[0034] Take food waste wastewater: CODcr: 80000mg / L, ammonia nitrogen: 350mg / L, total nitrogen TN: 900mg / L, total phosphorus TP: 150mg / L, suspended solids SS: 10000mg / L, animal and vegetable oil: 2000mg / L, pH for 3.

[0035] (1) After the secondary waste water from the above-mentioned catering waste treatment is collected, it enters the grid set in the grid well to remove the larger floating objects in the wastewater, and the color of the water body becomes lighter; the wastewater after removing the larger floating objects is passed into the slag removal and oil separator Remove the grease in the waste water, the grease is passed into the floating oil pool, and exported to the system;

[0036](2) The waste water after removing grease enters the adjustment tank to homogenize the water quality at room temperature, stir, and then add lye, usually sodium hydroxide, to adjust the pH of the water quality, and the pH reaches 7.2 to 7.5. Dosing reaction zone and air flotation device,...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 周震球
Owner JIANGSU ZHAOSHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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