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Device and method for extracting carbon source of sewage treatment plant from kitchen waste

A technology for sewage treatment plants and kitchen waste, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., to achieve easy operation, reduce odor, and improve quality. Effect

Pending Publication Date: 2019-01-29
XIAMEN WATER GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above applications only involve the treatment of kitchen waste itself

Method used

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  • Device and method for extracting carbon source of sewage treatment plant from kitchen waste

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Experimental program
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Effect test

Embodiment 1

[0056] Soak kitchen waste and 55°C hot water for 1 hour at a ratio of 1 kg: 2 L, and filter to obtain the kitchen waste filtrate. Heavy metal indicators of kitchen waste filtrate: Cu 0.09mg / L, Pb 0.28mg / L, Zn 0.54mg / L, Cr<0.03mg / L, Cd 0.02mg / L, Ni0.20mg / L, As 0.0047mg / L, Hg 0.0005mg / L.

[0057] "Water Quality Standards for Discharge of Sewage into Urban Sewers" (GB 31962-2015) control item limits (A level) are: Cu2mg / L, Pb 0.5mg / L, Zn 5mg / L, Cr 1.5mg / L, Cd 0.05mg / L L, Ni 1mg / L, As 0.3mg / L, Hg0.005mg / L.

[0058] "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) the maximum allowable discharge concentration is: Cu0.5mg / L, Pb 0.1mg / L, Zn 1.0mg / L, Cr 0.1mg / L, Cd 0.01mg / L L, Ni 0.05mg / L, As 0.1mg / L, Hg 0.001mg / L.

[0059] The heavy metal indicators of the kitchen waste filtrate are far lower than the control item limits of the "Water Quality Standards for Sewage Discharge into Urban Sewers" (GB31962-2015); the indicators except for Pb, Cd and Ni a...

Embodiment 2

[0062] The kitchen waste is transported to the crusher and the crushing grid by gravity conveying or manual shovel, so that the diameter is less than 20mm. The kitchen waste is fresh kitchen waste produced within 3 days, with a moisture content of about 80%. Then it is transported by gravity into the soaking pool, where 55°C hot water is added (the mass ratio of kitchen waste to hot water for soaking is 1:1.5), and soaked for 30 minutes. The solid-liquid mixture in the soaking tank is sent to the squeezer for squeezing, and separated into kitchen waste residue and kitchen waste filtrate. Take 3L filtrate in a beaker, first add 5.22g FeCl 3 (mass fraction 38%), then add 32.2g CaO (mass fraction 65%, 180 mesh), after stirring at 200r / min for 1min, then 100r / min for 5min. After coagulation, the kitchen waste filtrate was left to stand for 30 minutes, and the supernatant was taken for testing. The removal rate of TN can reach more than 41%, the removal rate of TP can reach more...

Embodiment 3

[0064] The kitchen waste is transported to the crusher and the crushing grid by gravity conveying or manual shovel, so that the diameter is less than 20mm. The kitchen waste is fresh kitchen waste produced within 3 days, with a moisture content of about 80%. Then it is transported by gravity into the soaking pool, where 55°C hot water is added (the mass ratio of kitchen waste to hot water for soaking is 1:1.5), and soaked for 30 minutes. The solid-liquid mixture in the immersion tank is sent to the squeezer for squeezing, separated into kitchen waste residue and kitchen waste filtrate, and the kitchen waste filtrate is transported to the coagulation reaction device. equipped with 3m 3 In the coagulation reaction device of kitchen waste filtrate, add 0.33‰FeCl successively 3 Solution (mass fraction 38%) and 0.7% lime powder were stirred at a speed of 200r / min for 1min, and then stirred at a speed of 100r / min for 5min. After coagulation, the kitchen waste filtrate was allowed ...

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Abstract

The invention relates to a device and a method for extracting a carbon source of a sewage treatment plant from kitchen waste. The device comprises a double-shaft shear type crusher (1), a crushing grating (2), a soaking and stirring barrel (3), a gravity pipe (4) and a screw press (5). The method comprises the following steps that firstly, the kitchen waste is crushed and soaked in hot water, andsqueezing and filtering are carried out on the soaked solid-liquid mixture to obtain the kitchen waste filtrate; and then ferric chloride and lime are added into the kitchen waste filtrate in sequence, coagulation reaction is carried out under stirring, and combined treatment is carried out on the upper-layer kitchen waste filtrate and the urban sewage after precipitation. According to the deviceand method, organic carbon source in the kitchen waste is released by hot water soaking, a part of grease is removed through coagulation, and C / N and C / P of the kitchen waste filtrate are improved; and the kitchen waste filtrate can be used as the carbon source needed by nitrogen and phosphorus removal reaction of the sewage treatment plant, contribution is made to upgrading and transformation ofthe sewage treatment plant, meanwhile, foul smell generation is reduced, and the purpose of recycling the kitchen waste is achieved.

Description

technical field [0001] The invention relates to the fields of solid waste treatment and water treatment, in particular to a device and method for extracting carbon sources of sewage treatment plants from kitchen waste. Background technique [0002] The easily degradable COD (chemical oxygen demand) contained in general urban sewage is limited. In low-carbon source sewage treatment systems, the phenomenon of low C / N (carbon-nitrogen ratio) is more prominent. In the process of sewage treatment , Between phosphorus release and denitrification reaction, there is a contradiction of competitively obtaining carbon source caused by insufficient carbon source, which makes it difficult to achieve ideal results at the same time for phosphorus removal and nitrogen removal. Therefore, in the case of the influent of general urban sewage treatment plants, the efficiency of denitrification and phosphorus removal is generally low only by biological action. [0003] In order to fully impleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00B02C21/00C02F1/52
CPCC02F1/5236B02C21/00B09B3/00B09B5/00B02C2201/06
Inventor 费霞丽陈咪梓余淑蓉刘美龄蔡娜婷张荣海郑东赞胡骏李伟力谢小青
Owner XIAMEN WATER GRP
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