排序方式: 共有25条查询结果,搜索用时 15 毫秒
1.
This study investigated the floc aggregation, average floc size, floc size variance and floc growth velocity when ferric chloride (FeCl3) and polyferric chloride (PFC) were used to treat the simulated water samples. The factors including coagulant dose, ionic strength and solution pH, which affect the floc aggregation, were studied. Experiments were carried out in a bench-scale reactor using photometric dispersion analyzer ( PDA). Results showed that there were great differences between the floc aggregation of PFC and FeCl3. The average floc size and fioc growth velocity of PFC were much larger than those of FeCl3. Compared with FeCl3, PFC gave a better coagulation performance in wider range of pH, dosage and ionic strength. It was also found that the coagulation efficiency of PFC did not depend on average floc size but on floc growth velocity. 相似文献
2.
3.
4.
水中无机阳离子混凝剂的电动检测特性研究 总被引:1,自引:0,他引:1
为了在本质特征上定量说明水中无机阳离子混凝剂浓度与胶体稳定性的关系,提出了一种新的研究混凝过程胶体电荷变化的本质参数-流动电流。研究了无机阳离子混凝剂的性质和家度与电动特性参数之间的一般规律及等电点特征,考察了以SC表征混凝剂对水中胶体颗粒物作用的特性与效能,从而提出了一种研究混凝和在线监测水中胶体电荷对于混凝剂投加量变化的有效方法。 相似文献
5.
This study investigated the floc aggregation, average floc size, floc size variance and floc growth velocity when ferric chloride (FeCl3) and polyferric chloride (PFC) were used to treat the simulated water samples. The factors including coagulant dose, ionic strength and solution pH, which affect the floc aggregation, were studied. Experiments were carried out in a bench-scale reactor using photometric dispersion analyzer (PDA). Results showed that there were great differences between the floc aggregation of PFC and FeCl3.The average floc size and floc growth velocity of PFC were much larger than those of FeCl3. Compared with FeCl3, PFC gave a better coagulation performance in wider range of pH, dosage and ionic strength. It was also found that the coagulation efficiency of PFC did not depend on average floc size but on floc growth velocity. 相似文献
6.
针对水厂原水水质情况,对4种不同混凝剂的污染物去除效果进行了试验对比,研究不同混凝剂用于水厂原水处理的混凝效果.为优化后续工艺提供依据。 相似文献
7.
8.
Coagulation followed by sedimentation, as a conventional technique in the water treatment plant, can be the first line of defense against exposures of carbon nanotubes (CNTs) to aquatic organisms and human beings, which has been rarely documented. This study investigated the removal of dispersant-stabilized CNT suspensions by poly aluminum chloride (PACl) and KAl(SO4)2. 12H2O (alum), with a focus on the effects of dispersant type, coagulant type and dosage. PACl performed better than alum in the removal of tannic acid-, humic acid-, and sodium dodecyl benzenesulfonate-stabilized CNTs, but worse for polyethylene glycol octylphenyl ether (TX100)-stabilized CNTs. Neither coagulant could effectively precipitate cetyltrimethyl ammonium bromide-stabilized CNTs. The removal by PACl first increased up to a plateau and then decreased with the continued increase of coagulant dosage. However, the removal rates leveled off but did not decrease after achieving their highest level with the continued addition of alum. The coagulation and flocculation of the CNT suspensions by PACl could be regulated mainly by the mechanism of adsorption charge neutralization, whereas the coagulation by alum mainly involved electrical double-layer compression. 相似文献
9.
不同混凝剂对污泥脱水性能的影响研究 总被引:11,自引:3,他引:8
采用无机和有机混凝剂对污泥进行调理,通过测定污泥比阻、Zeta电位以及污泥上清液中蛋白质、多糖和DNA含量,同时结合污泥上清液的三维荧光光谱分析,研究了不同混凝剂及其投加量对污泥脱水性能的影响.结果表明:当聚合氯化铝(PAC)、高效聚合氯化铝(HPAC)和氯化铁(FeCl3)的投加量在干污泥量的10%附近时,污泥比阻值最小,同时三维荧光强度值也最小,Zeta电位以及上清液中蛋白质、多糖和DNA的含量基本趋于稳定.无机混凝剂与有机混凝剂联合作用调理污泥后其脱水效果明显优于单一混凝剂调理.有机混凝剂与无机混凝剂投加顺序对污泥脱水性能影响显著,先投加无机混凝剂再投加有机混凝剂的脱水效果最佳,研究筛选出两种混凝剂联合作用调理污泥后,其脱水效果顺序为10%PAC+0.5%PAM>10%FeCl3+0.5%PAM>10%HPAC+0.5%PAM. 相似文献
10.