DOU Chuan-chuan,LIU Yu-ling,ZHAO Peng-he,et al.Effect of Alkaline Pretreatment on DOM Dissolution Characteristics of Excess Sludge and Parallel Factor Analysis[J].China Water & Wastewater,2021,37(19 19):14-21.
Effect of Alkaline Pretreatment on DOM Dissolution Characteristics of Excess Sludge and Parallel Factor Analysis
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
19 19
Page:
14-21
Column:
Date of publication:
2021-10-01
- Keywords:
- excess sludge; alkaline pretreatment; DOM; dissolution characteristics; parallel factor analysis
- Abstract:
- The excess sludge from a sewage treatment plant was pretreated by alkali, and the dissolved organic matter (DOM) composition, three-dimensional fluorescence characteristics, dissolved organic carbon (DOC) concentration, and infrared characteristics of the sludge were investigated. When the pH was 12, the disintegration rate of the sludge reached the maximum of 44.69%. The concentrations of soluble carbohydrate (SC) and soluble protein (SP) basically increased with the increasing pH, and changed at the cut-off point of pH of 11. The concentrations of SC and SP increased significantly when the pH was higher than 11. The parallel factor analysis (PARAFAC) divided the DOM in the alkaline pretreated sludge into four components, including two kinds of proteinlike components and two kinds of humus-like components, among which the content of humic acid substances increased significantly when the pH was 12. The liquid chromatography-organic carbon detector (LC-OCD) analysis showed that the biodegradable biopolymer and neutral low molecule material (LMW) components were dominant in the DOC when the pH was in the range of 9-11. However, when the pH was 12, the content of humus and humus precursors increased sharply, and some non-biodegradable humus dissolved out in large quantity, while some biodegradable organic matters were converted into non-biodegradable humus. Infrared spectrum analysis showed that the absorption peak area of carbohydrate and protein increased with the increasing pH. The absorption peak area of the amino acid group reached the maximum when the pH was 11, and that of the group with aromatic ring structure reached the maximum when the pH was 12. After comprehensive consideration, pH of 11 was the optimal alkaline pretreatment condition for sludge resource recovery.
Last Update:
2021-10-01