Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment

A sludge anoxic and ultrasonic technology, applied in the fields of environmental protection and comprehensive utilization of resources, achieves the effects of small footprint and volume, good economic benefits, and mature technology

Inactive Publication Date: 2011-05-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Judging from foreign research on ultrasonic treatment of sludge, it mainly focuses on the promotion of ultrason

Method used

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  • Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment
  • Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment
  • Method for improving sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Raw sludge (taken from Guangzhou Lijiao Sewage Treatment Plant, sludge moisture content is 98.3%, pH is 6.7, MLSS is 10.5g / L, MLVSS is 5.6g / L, COD in the sludge supernatant is 42mg / L L, ammonia nitrogen is 13mg / L, TP is 4mg / L) is injected into the reaction tank through the sludge inlet pump, the mixer in the reaction tank is turned on (120r / min), anoxic / aerobic alternating environment is provided through intermittent aeration, and the sludge The residence time is 12 days; 24 hours is a cycle, aerobic for 12 hours and anoxic for 12 hours. During the aerobic period, the intake volume is adjusted by the pipeline aeration switch, and the DO is controlled at 5.5-6.0 mg / L. During the reaction, the temperature was controlled at about 25°C. The sludge in the reactor is discharged and fed once every 24 hours. The amount of sludge discharged and fed is 8.3% of the sludge in the sludge anoxic / aerobic digestion bioreactor, and the concentration of the sludge fed is 9.5 ~10.5g / L. ...

Embodiment 2

[0027] The raw sludge (taken from Guangzhou Lijiao Sewage Treatment Plant, the sludge moisture content is 97.3%, the pH is 7.1, the MLSS is 10.2g / L, the MLVSS is 5.4g / L, and the COD in the sludge supernatant is 40mg / L L, ammonia nitrogen is 12mg / L, TP is 10mg / L) respectively injected into the two reaction pools A and B through the mud inlet, the sludge in the A reaction pool is only subjected to anoxic / aerobic digestion, and the sludge in the B reaction pool is subjected to ultrasonic - Hypoxic / aerobic digestion. Other experimental conditions are the same as Example 1. After 11 days of digestion, the MLSS removal rate and MLVSS removal rate of the sludge in the B reaction tank increased by 10.23% and 13.03% respectively compared with the sludge in the A reaction tank and reached stability. The pool digestion time was shortened by 9 days compared with the A reaction pool.

Embodiment 3

[0029] The raw sludge (taken from Guangzhou Lijiao Sewage Treatment Plant, the sludge moisture content is 98.9%, the pH is 6.8, the MLSS is 11.5g / L, the MLVSS is 5.7g / L, and the COD in the sludge supernatant is 40.8mg / L, ammonia nitrogen is 6mg / L, TP is 14mg / L) are injected into two reaction pools A and B respectively through the mud inlet, the sludge in the A reaction pool is subjected to aerobic digestion, and the sludge in the B reaction pool is subjected to ultrasonic-anoxic / good Oxygen digestion. Other experimental conditions are the same as Example 1. After 11 days of digestion, the MLSS removal rate and MLVSS removal rate of the sludge in the B reaction pool were close to those in the A pool, but the total nitrogen removal rate in the B pool was 38.7%, which was higher than that in the A pool, and the sludge supernatant in the B pool The concentration of ammonia nitrogen is also much lower than that of pool A. In addition, the specific resistance of the sludge in the...

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Abstract

The invention discloses a method for improving the sludge anoxic/aerobic digestion property by utilizing ultrasonic pretreatment. The method comprises the following steps of: supplying sludge to a sludge anoxic/aerobic digestion reactor and providing an anoxic/aerobic environment through intermittent aeration, wherein the sludge retention time is 12 days, 24 hours form a period, the aerobic time is 12 hours, the anoxic time is 12 hours, 8.3 percent of digested sludge is discharged every day, and sludge which is equivalent to the discharged sludge and pretreated through ultrasonic waves is input every day. In the invention, low-energy ultrasonic pretreatment and sludge anoxic/aerobic digestion are combined, thus the sludge is cracked to a certain extent, the bioactivity of the sludge is enhanced, and the anoxic/aerobic digestion property of the sludge is improved; compared with a technology singly adopting sludge anoxic and aerobic/anoxic digestion or the traditional ultrasonic-aerobicdigestion technology, the method has the advantages of improving the sludge digestion efficiency and shortening the digestion time; and the method also has the advantages of reducing the aeration energy consumption and saving the energy expense.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource comprehensive utilization, in particular to a method for improving sludge anoxic / aerobic digestion performance by ultrasonic pretreatment Background technique [0002] Residual sludge is the final product of sewage biological treatment. It contains heavy metals, pathogenic bacteria, organic pollutants and other harmful substances, which may cause serious secondary pollution if not handled properly. With the further popularization of sewage treatment facilities, the increase of treatment capacity, the improvement of treatment standards and the expansion of treatment functions, the amount of sludge produced will increase significantly. The treatment and disposal of sludge will become a major problem in the field of environment. At present, sludge treatment and disposal methods include: sanitary landfill, ocean dumping, sludge incineration, sludge resource utilization, etc. Sa...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/02
CPCY02W10/20
Inventor 孙水裕许燕滨郑莉宋卫锋戴文灿刘敬勇谢武明
Owner GUANGDONG UNIV OF TECH
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