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Advanced oxidation synchronization/coupling flocculation conditioning method for deep dehydration of sludge

A technology of deep dehydration and advanced oxidation, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as limited engineering application, save transportation costs, large output, and improve pollution. The effect of mud press filter dewatering efficiency

Pending Publication Date: 2022-04-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although previous research results have achieved better treatment efficiency advantages in laboratory tests, considering the economics of sludge treatment, these technologies cannot be used in engineering applications or are very limited in engineering applications

Method used

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  • Advanced oxidation synchronization/coupling flocculation conditioning method for deep dehydration of sludge

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Effect test

Embodiment 1

[0034] The advanced anaerobic digestion sludge (autumn) to be conditioned is taken from a sewage plant in a certain city. The moisture content of the sludge is 97.2%, the pH value is 6.9, the VSS / TSS value is 0.71, the Zeta potential is -15.6mV, and the SCOD value is 117mg / L at a temperature of 25°C.

[0035] Conditioning method 1: The specific implementation steps of the conditioning method based on advanced oxidation synchronous / coupling flocculation are as follows:

[0036] 1) After taking 200mL of the sludge to be conditioned in the beaker, stir at 200rpm for 1min to mix the sludge evenly;

[0037] 2) Add 2 g of siderite powder with a particle size of 150 μm to the sludge liquid, and stir at 200 rpm for 2 minutes;

[0038] 3) Add 1mL of hydrogen peroxide (30% effective volume concentration) to the sludge mixture 2 minutes after the conditioning starts, stir at 200rpm for 2min at high intensity, then stir at 50rpm for 56min at low intensity, and confirm the cell wall by dete...

Embodiment 2

[0056] The advanced anaerobic digestion sludge (winter) to be conditioned is taken from a sewage plant in a city. The moisture content of the sludge is 96.5%, the pH value is 6.6, the VSS / TSS value is 0.67, the Zeta potential is -13.8mV, and the SCOD value is 108mg / L at a temperature of 25°C.

[0057] Conditioning method 1: The specific implementation steps of the conditioning method based on advanced oxidation synchronous / coupling flocculation are as follows:

[0058] 1) After taking 200mL of the sludge to be conditioned in the beaker, stir at 200rpm for 1min to mix the sludge evenly;

[0059] 2) Add 2 g of siderite powder with a particle size of 150 μm to the sludge liquid, and stir at 200 rpm for 2 minutes;

[0060] 3) Add 1mL of hydrogen peroxide (effective concentration: 30%) to the sludge mixture 2 minutes after conditioning, stir at 200rpm for 2min at high intensity, then stir at 50rpm for 56min at low intensity, and confirm the cell wall rupture rate by detecting ATP ...

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Abstract

The invention relates to the technical field of sludge treatment, in particular to an advanced oxidation synchronization / coupling flocculation conditioning method for deep dehydration of sludge. Siderite and hydrogen peroxide are sequentially added at the beginning of sludge conditioning to break walls of microbial cells in a sludge mixed solution, water in the microbial cells is promoted to be gradually and partially migrated and removed in the sludge filter pressing and dewatering process, meanwhile, Fe < 2 + > released by the siderite is oxidized into Fe < 3 + > to serve as a flocculating agent to play a role in electric neutralization, and the water content of the microbial cells is reduced; the adding amount of an inorganic flocculating agent (such as polymeric metal salt) in the subsequent technological process is effectively reduced; siderite serves as a flocculation core to strengthen rapid formation of sludge flocs after polymeric metal salt and cationic polyacrylamide are added, the particle size of the flocs is increased, the structure of the flocs is denser, and follow-up efficient filter pressing dehydration is facilitated.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to an advanced oxidation synchronous / coupling flocculation conditioning method for deep sludge dehydration. Background technique [0002] Sludge dehydration reduction has always been a thorny problem to be solved in sewage plants, and its treatment costs account for about 50% of the operating costs of the entire sewage treatment plant. Therefore, how to improve the dewatering efficiency of sludge while ensuring the economical consumption of chemicals in the dehydration process is an important topic worthy of in-depth study in engineering practice. In recent years, a lot of research has been carried out on the above problems and some research progress has been made, including the development of high-efficiency chemical agents, the application of physical methods such as thermal hydrolysis and ultrasonic technology, and the development of biological enzymes with specific degr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/00C02F11/06
CPCC02F11/143C02F11/00C02F11/06C02F2305/023
Inventor 俞文正苏兆阳刘敏敏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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