Pilot-scale microsand-ballasted flocculation of wastewater: turbidity removal, parameters optimization, and mechanism analysis

被引:4
|
作者
Sang, Yimin [1 ]
Lu, Taotao [1 ]
Lu, Xianchun [2 ]
Wang, Shuguang [3 ]
Shao, Xueting [4 ]
Han, Yanhe [1 ]
Li, Lili [1 ]
机构
[1] Beijing Inst Petrochem Technol, Dept Environm Engn, Beijing 102617, Peoples R China
[2] SDIC Xinkai Water Environm Investment Co Ltd, Beijing 101101, Peoples R China
[3] Beijing Univ Chem Technol, Dept Environm Sci & Engn, Beijing 100029, Peoples R China
[4] Minist Ecol & Environm, Tech Ctr Soil Agr & Rural Ecol & Environm, Beijing 100012, Peoples R China
基金
国家重点研发计划;
关键词
Microsand-ballasted flocculation; Pilot-scale; Turbidity removal; Parameter optimization; Mechanism analysis; SECONDARY EFFLUENT; PERFORMANCE; LEACHATE;
D O I
10.1007/s11356-021-18453-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The flocs formed during microsand-ballasted flocculation (MBF) have attracted much attention. However, few studies have reported on comprehensive process parameters of MBF and its mechanism is still not well understood. Jar test and pilot-scale continuous experiments were here conducted on two kinds of simulated wastewater, labeled S1 (21.6-25.9 NTU) and S2 (96-105 NTU). Results revealed the hydraulic retention time ratio in the coagulation cell, injection and maturation cell, lamella settler of pilot-scale MBF equipment was 1:3:7.3. The optimum poly aluminum chloride doses for samples S1 and S2 were 0.875 g/L and 1.0 g/L. Besides, the optimum size of microsand was 49-106 mu m and the optimum dose was 1.0 g/L. Under aforementioned conditions, the effluent turbidity of S1 was below 0.47 NTU, even lower than the Chinese drinking water standard; that of S2 was below 1.7 NTU, meeting the Chinese recycled water standard. Turbidity removal ranged from 98.0 to 98.8% for S1 and 98.5 to 99.5% for S2 when microsand was added. Therefore, microsand addition enhances MBF performance, where microsand serves as an initial core particle. Some microsand core particles bond together to form a dense core structure of micro-flocs by the adsorption bridging of inorganic polymeric flocculant. Moreover, the size of the largest micro-flocs may be controllable as long as the effective energy dissipation coefficient is adjusted appropriately through specific stirring speeds. This work provides comprehensive pilot-scale process parameters for using MBF to effectively treat wastewater and offers a clearer explanation of the formation mechanism of microsand-ballasted flocs.
引用
收藏
页码:32161 / 32170
页数:10
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