Method for granulating sludge based on pure-oxygen aeration-treated urban sewage

A technology for sludge granulation and domestic sewage, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of long granulation cycle of activated sludge and small particle size of sludge , increase the granular sludge and other problems, to achieve the effect of easy large-scale promotion, increased particle size, and low cost

Active Publication Date: 2013-11-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current situation of low dissolved oxygen, long activated sludge granulation period and small sludge particle size during air aeration, the present invention provides a method based on pure oxygen sludge granulation of urban domestic sewage to achieve increased The purpose of granular sludge, dense sludge particle structure, and shortening the cultivation time

Method used

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  • Method for granulating sludge based on pure-oxygen aeration-treated urban sewage
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  • Method for granulating sludge based on pure-oxygen aeration-treated urban sewage

Examples

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Embodiment 1

[0019] In this example, the method based on pure oxygen sludge granulation of urban domestic sewage adopts a sequencing batch reactor 2 (SBR) with an aspect ratio of 10. The main part of the column is cylindrical, with an inner diameter of 0.1m and an outer diameter of 0.12 m, the height is 1.0m. The bottom of the reactor 2 is provided with a microporous aeration head 3, the microporous aeration head 3 is connected with the oxygen cylinder 1 through the aeration pipe 9, the aeration pressure is controlled by the pressure reducing valve 5, and the aeration volume is controlled by the rotameter 6 Control and adjustment, the raw water in the water tank 11 is poured into the reactor 2 through the water inlet pump 10 for sludge cultivation, the reactor is controlled by the solenoid valve 7 to drain to the secondary sedimentation tank 8, the aeration period is controlled by the air inlet valve 4, and the aeration cycle is controlled by the water inlet pump 10 Control the water intak...

Embodiment 2

[0024] The difference between this example and Example 1 is that the method based on the granulation of pure oxygen sludge from urban domestic sewage uses a sequencing batch reactor (SBR) with a height-to-diameter ratio of 11. The inner diameter of the column is 0.1m, and the outer diameter is 0.11m, height 1.1m; in the second stage of sludge granulation cultivation, COD, ammonia nitrogen, total phosphorus, and calcium ion concentrations reached 600mg / L, 100mg / L, and 9mg / L respectively; during the cultivation period, the calcium ion concentration was 100mg / L; The fourth stage of granulated sludge cultivation takes 6 days to form granulated sludge.

Embodiment 3

[0026] The difference between this example and Example 1 is that the method based on the granulation of pure oxygen sludge from urban domestic sewage adopts a sequencing batch reactor (SBR) with a height-to-diameter ratio of 12.5, the inner diameter of the column is 0.08m, and the outer diameter is 0.09m, height 1.0m; in the second stage of sludge granulation cultivation, COD, ammonia nitrogen, total phosphorus, and calcium ion concentrations reached 800mg / L, 120mg / L, and 10mg / L respectively; during the cultivation period, the calcium ion concentration was 120mg / L; The fourth stage of granulated sludge cultivation takes 3 days to form granulated sludge.

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Abstract

The invention discloses a method for granulating sludge based on pure-oxygen aeration-treated urban sewage, and belongs to the technical field of sewage treatment. According to the method, an SBR reactor with a height-diameter ratio of 10-12.5 and a water discharge ratio of 50-70% is employed. Pure oxygen is subjected to aeration via the diffuser at the bottom of the reactor, wherein the aeration quantity is 0.85-1.54 m<3>/m<3>.h, the temperature in the reactor is 17-23 DEG C, pH value is 5.5-8.0 and the operation cycle of the reactor is 12 h. Four stages are designed for stepped culture, the culture time is short and sludge granulation is finished in 33-40 d. The granular sludge obtained by the method of the invention has a compact structure, the particle size of 3.0-5.0 mm and the particle setting speed of 20-35 m/h. The method of the invention is simple in culture technology and short in granulation period, helps to solve the disadvantages of long granulation period and small particles in air aeration, is applicable to high-density sewage treatment and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and more specifically relates to a method for granulating sludge based on pure oxygen aeration of urban domestic sewage. Background technique [0002] The floc sludge plays a role in the traditional activated sludge sewage treatment system, which has loose structure, small particle size (0.05-0.2mm), low density, low impact load resistance, poor sludge settling performance, and easy The occurrence of sludge bulking leads to unstable operation of the system. Therefore, in order to improve the sludge structure, research on the aerobic granular sludge process has emerged. [0003] The aerobic granular sludge process has become a research hotspot at home and abroad because of its strong resistance to impact load, simultaneous denitrification and carbon removal, and small footprint. "An aerobic granular sludge process for treating urban sewage and aerobic granular sludge (ZL200810019551.7, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 胡小兵刘孔辉赵鑫江用彬
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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