CHENShuo-jun,ZHAXiao,WANGLing-zhi,et al.Optimization of Preparation Conditions and Evaluation of Coarse Organic Flocculant for Capturing Organic Matter[J].China Water & Wastewater,2024,40(21):1-8.
Optimization of Preparation Conditions and Evaluation of Coarse Organic Flocculant for Capturing Organic Matter
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
1-8
Column:
Date of publication:
2024-11-01
- Keywords:
- wastewater resource utilization; sludge hydrothermal treatment; graft copolymerization; coarse organic flocculant
- Abstract:
- The resource utilization of municipal wastewater has been widely concerned, and the recovery of organic matter is an important step. It is proposed to treat sewage sludge with hydrothermal process, and use large molecular substances in hydrothermal solution as raw materials to prepare coarse organic flocculant（COF) for capturing and recovering organic matter in sewage. However，the prophase preparation complex hindered the application of COF. The preparation process was improved by reducing the refining steps, modifying the types of monomers used, and optimizing the nitrogen injection time; And the preparation conditions (pH, temperature, time, and the modified monomers ratio) was optimized. The results showed that the suitable preparation conditions were as follows: adding nitrogen within 30 min before the graft copolymerization reaction, pH=5, reaction time of 2.5 hours, temperature of 70 ℃, and the ratio of liquid macromolecular substances to methyl acryloxythyethyl trimethylammonium chloride (DMC) of 1∶0.7. The obtained COF had better flocculation performance and economy. When the dosage of COF was 30 mg/L, 54% of the COD in the wastewater could be captured, and the capture efficiency was increased by 64%.
Last Update:
2024-11-01