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Design and Study of Pilot-scale Sludge Lysis/Hydrolysis and Acidification/CAS Process for Sludge Reduction

Author: GuoXingLi
Tutor: ZhangShuTing
School: Tianjin University
Course: Environmental Engineering
Keywords: Lee I sludge Sludge Reduction Ultrasonic wave Hydrolysis acidification Engineering design
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 132
Quote: 1
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Abstract


Based on the sludge lysis - cryptic growth of microorganisms in the process of the sludge reduction method is the Lee I sludge an important way to solve the sewage treatment process, sludge lysis became the core of the process with key . This thesis the alkali / ultrasonic - hydrolysis acidification-CAS process Lee I sludge reduction, broken hydrolysis acidification effects, and the basis of the small test experimental results, the process the design and calculation of the test project. The hydrolysis acidification experimental results show that hydrolysis acidification reaction after 72 h of inoculation ratio of 20% under the dissolution rate of hydrolysis acidification COD and VFAs highest; favor concentrated 12h after sludge hydrolysis acidification; and compare the alkali, alkali / ultrasound alkali / heat and alkali / TW.80 of the four sludge lysis method of hydrolysis acidification effects, followed by a comparison of the acidification rate found the alkali / ultrasound is superior to the other. Laboratory small test experiment Lee I sludge after alkali / ultrasonic - hydrolysis acidification flowed back to the aeration tank cryptic growth, the degree of reduction of 79% after 30 d of stable operation. Experimental basis, the alkali / ultrasonic - hydrolysis acidification-CAS overall process design calculations and economic costs of Xin. Designed daily processing water 400m3 / d, Lee I generated sludge is concentrated to a moisture content of 97.5% was added 214g / L of sodium hydroxide, the ultrasonic reactor packed volume O.5L, ultrasonic time of 5.66s, the lysing rate reached 25%, the lysate after the sludge need to be allowed to stand to react for approximately 10 h, the lysis effect to make full use of the base, and is conducive to the subsequent hydrolysis of acidified. Return flow to the aeration tank cryptic growth after the sludge hydrolysis acidification improve biodegradability, sludge reduction process, the design goal is to ensure water quality meet the national emission standards to achieve 66.8% of the sludge reduction effect and economic costs more than traditional sludge disposal cost savings. Concentrated to different moisture content of the sludge; design the ultrasound device tilted thin layer of sludge ultrasound; the hydrolysis acidification residence time can be flexibly adjusted; the hydrolysis acidification water bath heated 2000 w heating power, copper serpentine tube heating the sludge in the container of homemade. Hydrolysis acidification reactor sludge flow characteristics, design the 4 leaf 45 ° oblique paddle baffle Nagata empirical formula of the pulp critical stirring rate, and calculate the motor power.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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