Coupled Fenton oxidation and anaerobic digestion reactor for treating surplus sludge

A technology of excess sludge and anaerobic digestion, used in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., to achieve uniform distribution, improve treatment effect and efficiency of chemical use, and increase sludge digestion. The effect of efficiency

Active Publication Date: 2014-04-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and deficiencies of the existing Fenton treatment of sludge, and provide a method for the combined use of Fenton oxidation and anaerobic digestion to realize the reduction of excess sludge for excess sludge treatment and resource utilization, so as to achieve A reaction device coupled with Fenton oxidation and anaerobic digestion for excess sludge treatment by making full use of Fenton oxidation and anaerobic digestion to produce biogas to achieve sludge reduction and resource utilization

Method used

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  • Coupled Fenton oxidation and anaerobic digestion reactor for treating surplus sludge

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Effect test

Embodiment 1

[0044] A reaction device coupled with Fenton oxidation and anaerobic digestion is used to treat excess sludge with a sludge concentration of 4g / L. The device includes the following process steps:

[0045] 1. The remaining sludge to be treated is pumped into the acid adding tank with a pump. Turn on the acid adding device 1, add nitric acid to the front end of the acid adding pool 7, adjust the pH to be controlled at about 3.0, use the ferrous adding device 2 to add ferrous nitrate 450mg / L to the ferrous pool 8, and enter it at the entrance of the Fenton main reaction pool 9 end, through the H 2 o 2 Dosing device 3 adds 3750mg / L H 2 o 2 , and reacted in Fenton main reaction tank 9 for 45 minutes. After the reaction is complete, it enters the alkali adding tank 10, and uses the alkali adding device 4 to add NaOH to adjust the pH to 9.0. After adding PAM to the front end of the PAM adding tank 11 for flocculation, it flows into the sedimentation tank 12.

[0046] 2. The iron...

Embodiment 2

[0050] A reaction device coupled with Fenton oxidation and anaerobic digestion is used to treat excess sludge with a sludge concentration of 8g / L. The method includes the following process steps:

[0051] 1. The remaining sludge to be treated is pumped into the acid adding tank with a pump. Turn on the acid adding device 1, add nitric acid to the front end of the acid adding pool 7, adjust the pH to about 3.5, use the ferrous adding device 2 to add ferrous nitrate 900mg / L to the ferrous adding pool 8, and enter the Fenton main reaction pool 9 end, add 7500mg / L H through H2O2 dosing device 3 2 o 2 , and reacted in Fenton main reaction tank 9 for 60 minutes. After the reaction is complete, it enters the alkali-adding tank 10, and uses the alkali-adding device 4 to add NaOH to adjust the pH to 9.5. After adding PAM to the front section of the PAM-adding tank 11 for flocculation, it flows into the sedimentation tank 12.

[0052] 2. The iron-containing sludge at the bottom of th...

Embodiment 3

[0056] A reaction device coupled with Fenton oxidation and anaerobic digestion is used to treat excess sludge with a sludge concentration of 12g / L. The method includes the following process steps:

[0057] 1. The remaining sludge to be treated is pumped into the acid adding tank with a pump. Turn on the acid adding device 1, add nitric acid to the front end of the acid adding pool 7, adjust the pH to about 4.0, use the ferrous adding device 2 to add ferrous nitrate 1350mg / L to the ferrous adding pool 8, and enter it at the entrance of the Fenton main reaction pool 9 At the end, add 11250mg / LH2O2 through the H2O2 dosing device 3, and react in the Fenton main reaction tank 9 for 90min. After the reaction is complete, it enters the alkali-adding tank 10, and uses the alkali-adding device 4 to add NaOH to adjust the pH to 8.5. After adding PAM to the front section of the PAM-adding tank 11 for flocculation, it flows into the sedimentation tank 12.

[0058] 2. The iron-containing ...

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Abstract

The invention relates to a coupled Fenton oxidation and anaerobic digestion reactor and process for treating surplus sludge. The reactor mainly comprises a Fenton oxidation device and an anaerobic digestion device and jointly uses the two digestion methods of Fenton oxidation and anaerobic digestion. Compared with the prior art, the reactor provided by the invention has the advantages of high reagent use efficiency, low energy consumption, simple structure, obviously increased sludge digestion efficiency and gas yield and the like.

Description

technical field [0001] The invention relates to the fields of environmental engineering and solid waste treatment engineering, in particular to a method for reducing excess sludge by combined use of Fenton oxidation and anaerobic digestion. Background technique [0002] The remaining sludge produced by sewage treatment plants generally contains a large amount of organic matter, rich in nitrogen, phosphorus, potassium and trace elements, and can be effectively used; however, untreated sludge also contains heavy metals, pathogenic bacteria, parasites and some Refractory organic poisons, if not handled properly, will cause serious harm to the environment after discharge. Sludge treatment includes concentration, digestion (biological digestion, sludge composting, pyrolysis and chemical stabilization), dehydration, drying, etc. Currently, common methods of sludge disposal include landfill, ocean disposal, sludge incineration, and land use , Utilization of building materials, slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/00C02F11/04
CPCY02E50/30
Inventor 王进邱江平李旭东李银生
Owner SHANGHAI JIAO TONG UNIV
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