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Electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment

A pretreatment and electrochemical technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems affecting the subsequent utilization of sludge, complicated system regulation process, and toxic effects of by-products , to achieve the effects of saving the cost of chemicals, improving reaction efficiency and promoting electro-oxidation

Active Publication Date: 2017-09-22
ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems in the application of the above method, such as high cost of chemicals, high energy consumption, and strong toxic effects of by-products.
[0004] Therefore, the current problem of in-situ sludge reduction is the high cost of chemicals and high energy consumption of the system, the complex control process of the system, which affects the subsequent utilization of sludge, and poor environmental benefits.

Method used

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  • Electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment
  • Electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: a kind of electro-Fenton source sludge reduction method based on electrochemical sludge pretreatment of the present invention comprises the following steps:

[0026] (1) Electrolytic pretreatment of excess sludge: After the excess sludge with a solid content of 3%-5% enters the reactor, a pre-electrolytic reaction is carried out. When the pH value and temperature conditions meet the requirements of electro-Fenton treatment, it starts to run one step;

[0027] (2) Electro-Fenton oxidation treatment of sludge: After the pH value and temperature conditions of the electrolytically pretreated sludge meet the requirements of electro-Fenton treatment, the aeration equipment near the cathode at the bottom of the reactor starts to aerate and injects air into the reactor. Put in iron powder;

[0028] (3) Sludge pH adjustment: add Ca(OH) with a concentration of 5% to the sludge after electro-Fenton oxidation treatment 2 The solution adjusts the pH of the sludge to ...

Embodiment 2

[0037] Embodiment 2: The difference between this example and Example 1 is: electrolytic pretreatment of residual sludge in the step (1) in the electro-Fenton source sludge reduction method based on electrochemical sludge pretreatment: voltage The gradient is 6V / cm, and the pretreatment time is 30min.

[0038] In the step (2), the pH of the electro-Fenton oxidation treatment of the sludge is controlled at 3, and the ratio of the dry weight of iron powder to the sludge to the reactor is 0.005.

[0039] The (3) step sludge pH value adjustment: add Ca(OH) with a concentration of 5% to the sludge after electro-Fenton oxidation treatment 2 The solution adjusts the pH of the sludge to 7, Ca(OH) 2 The ratio of dosage to sludge dry weight is 0.05.

Embodiment 3

[0040] Embodiment 3: The difference between this example and Example 1 is: electrolytic pretreatment of residual sludge in the step (1) in the electro-Fenton source sludge reduction method based on electrochemical sludge pretreatment: voltage The gradient is 2V / cm, and the pretreatment time is 20min.

[0041] In the step (2), the pH of the electro-Fenton oxidation treatment of the sludge is controlled at 2, and the ratio of the dry weight of the iron powder to the sludge to the reactor is 0.005.

[0042] The (3) step sludge pH value adjustment: add Ca(OH) with a concentration of 5% to the sludge after electro-Fenton oxidation treatment 2 The solution adjusts the pH of the sludge to 7, Ca(OH) 2 The ratio of dosage to sludge dry weight is 0.03.

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Abstract

An electro-Fenton source sludge reduction method and system based on electrochemical sludge pretreatment belongs to the technical field of excess sludge treatment. The present invention fully combines the conditions and characteristics of electrolytic sludge reaction and sludge electro-Fenton oxidation, and its system includes sewage plant aeration tank, sewage plant secondary sedimentation tank, main reaction tank circulation system and sludge circulation pump I which are sequentially connected in circulation , the secondary sedimentation tank of the sewage plant is connected to the aeration tank of the sewage plant through the sludge return pipeline; the main reactor system of the electric Fenton sludge treatment includes the electric Fenton main reactor, the sludge circulation pump II and the sludge storage The end of the electric Fenton main reactor is connected to the secondary settling tank of the sewage plant, and the end of the sludge storage tank is connected to the sludge circulation pump I. The original microbial cell structure of the treated sludge in the present invention is completely destroyed, which is beneficial to further circulation back to the aeration tank for aerobic digestion. The available carbon source obtained by cracking is further decomposed and metabolized by microorganisms, thereby reducing the discharge of excess sludge from the sewage plant from the source and realizing the in-situ reduction of sludge.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and specifically relates to a method of combining electrochemical sludge pretreatment and electro-Fenton to achieve deep cracking of sludge, and the cracked sludge enters the aeration tank of a sewage plant through pH adjustment, thereby Realize the in-situ reduction of excess sludge in sewage plants. Background technique [0002] Excess sludge is an inevitable by-product of activated sludge treatment of wastewater in urban sewage treatment plants. This kind of material has high water content, high adhesion with water, poor dehydration performance, complex types of toxic and harmful substances, and difficulty in solid recovery. , high follow-up disposal costs, etc. Therefore, how to reduce sludge production from the source and explore new in-situ sludge reduction technologies are currently hot issues in the research of the sewage treatment industry. [0003] At present, the in-sit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/00
Inventor 黄殿男王冬傅金祥李薇王铎艾志生于鹏飞
Owner ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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