Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge  

作　　者：Xinbo Tian Chong Wang Antoine Prandota Trzcinski Leonard Lin Wun Jern Ng 

机构地区：[1]Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University [2]School of Civil and Environmental Engineering, Nanyang Technological University [3]Public Utilities Board, Water Reclamation (Plants) Department [4]Nanyang Environment and Water Research Institute, Nanyang Technological University

出　　处：《Journal of Environmental Sciences》2015年第3期97-105,共9页环境科学学报（英文版）

摘　　要：This work provides insights on the solubilization products after a simultaneous combination of alkaline and ultrasonic （ALK ＋ ULS） pre-treatment of sewage sludge. Soluble chemical oxygen demand （SCOD） increased from 1200 to 11,000 mg/L after such treatment. Organics with molecular weight around 5.6 kDa were solubilized because of the synergistic effect of ultrasound and alkali. Organics with molecular weight larger than 300 kDa increased from 7.8% to 60%, 16% and 42.3% after ULS, ALK and ALK ＋ ULS treatment, respectively. Excitation emission matrix fluorescence spectroscopy analysis identified soluble microbial product-like and humic acid-like matters as the main solubilization products. Sludge anaerobic biodegradability was significantly enhanced with the simultaneous application of ALK ＋ ULS pre-treatment. ALK ＋ ULS pre-treatment resulted in 37.8% biodegradability increase compared to the untreated sludge. This value was higher compared to the biodegradability increase induced by individual ALK pre-treatment （5.7%） or individual ULS pre-treatment （20.7%） under the same conditions applied.This work provides insights on the solubilization products after a simultaneous combination of alkaline and ultrasonic （ALK ＋ ULS） pre-treatment of sewage sludge. Soluble chemical oxygen demand （SCOD） increased from 1200 to 11,000 mg/L after such treatment. Organics with molecular weight around 5.6 kDa were solubilized because of the synergistic effect of ultrasound and alkali. Organics with molecular weight larger than 300 kDa increased from 7.8% to 60%, 16% and 42.3% after ULS, ALK and ALK ＋ ULS treatment, respectively. Excitation emission matrix fluorescence spectroscopy analysis identified soluble microbial product-like and humic acid-like matters as the main solubilization products. Sludge anaerobic biodegradability was significantly enhanced with the simultaneous application of ALK ＋ ULS pre-treatment. ALK ＋ ULS pre-treatment resulted in 37.8% biodegradability increase compared to the untreated sludge. This value was higher compared to the biodegradability increase induced by individual ALK pre-treatment （5.7%） or individual ULS pre-treatment （20.7%） under the same conditions applied.

关 键 词：Ultrasound AlkaliSewage sludge Molecular weight Excitation emission matrix （EEM） Anaerobic biodegradability 

分 类 号：X703[环境科学与工程—环境工程] TS255.3[轻工技术与工程—农产品加工及贮藏工程]