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Study on Preparation and Utilization of Adsorbent from Sludge Pyrolysis by Microwave

Author: ZhaoJuan
Tutor: TianYu
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: microwave sludge absorbent reuse dye wastewater
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 365
Quote: 5
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Abstract


The increase in production of sewage sludge is a matter of growing concern because it has caused serious environmental pollution. Making full use of available component in sludge and converting waste into valuable substance was the final disposal way in the future.When wet sludge was mixed with activated carbon and pyrolyzed under the microwave radiation, it can be converted into gas and oils with higher calorific value. And the solid residues generated in this course can be used further as a microwave absorber. Based on this, the solid residues can be used as a microwave absorber to preparate adsorbent by microwave-induced pyrolysis. And it was used to treat dye wastetater. The Adsorption changes about sludge adsorbent after reuse for several times was studied, and a new approach to realize utilization was advised. the adsorption capacity of sludge adsorbent was studie by BET, XRD and FITR.Study on preparation of sludge adsorbent by pyrolysis showed that the optimum condition was microwave 1200W, radiation time 10min, 35g wet sludge mixed with 10g microwave absorber. Iodine adsorption value of the sludge adsorbent under the above condition is 585.95mg/g. Based on this, the solid residues was reused as a microwave absorber for several times, and the temperature can achieve 800℃quickly. However, with the increasing of the reuse times, the absorber was broken by fusion and pulverization, so the adsorption capacity decreased. The reusing method should be determined according production condition and actural need.Study on treatment of dye wastewater by sludge adsorbent showed that adsorbing rate of sludge adsorbent to adsorb eosin and safranine followed secondary level adsorption dynamic model. Basing on the study of adsorption isothermal, we discovered that eosin fit well to the Langmuir Equation; safranine fits well to the Freundlich Equation. The adsorption capacity of eosin and safranine was 55.73% and 67.82% of active carbon respectively.Study on the adsorption mechanism of sludge adsorbent showed that the BET of sludge adsorbent obtained by pyrolyzing once is 459m2/g, the pore volume was 0.23 ml/g, and the average pore diameter was 3.10nm. With the increasing of the pyrolysis times, the BET and the pore volume decreased and the average pore diameter increased.The technology of preparing sludge adsorbent by mixing solid residues by sludge pyrolysis has the advantage of high effective, high-speed. It produced less poison substance but gas and oils with higher calorific value. Adsorbent prepared through this technology has very good effect on treating of dye wastewater, and has a good application prospect.

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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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