Treatment of highly turbid water using chitosan and aluminum salts

Hu, Ching Yao; Lo, Shang Lien; Chang, Chia Ling; Chen, Fu Ling; Wu, Yu; Lin, Jianwei

doi:10.1016/j.seppur.2012.11.016

Cited by 71 publications

(41 citation statements)

References 32 publications

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“…7 According to statistics, the turbidity of the waste water has reached 10 000 NTU in some cases in China. 8 Therefore, it becomes an important issue for environment engineers to separate and remove these suspended solids form waste water efficiently. In the process of waste water treatment, occulation is regarded as an important purication technique and has been widely applied due to its prominent advantages such as high efficiency, low cost and simple operation compared with other purication techniques.…”

Section: Introductionmentioning

confidence: 99%

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

et al. 2017

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ab Ultraviolet (UV)-initiated template polymerization (UTP) was used as a feasible strategy to prepare a novel anionic polyacrylamide (APAM) with a microblock structure. In the template copolymerization system, acrylamide (AM) and sodium allylsulfonate (SAS) were used as monomers, and poly Results showed that the novel anionic microblock structure was formed in the template copolymer.Besides, the results of the association constant (K M ) indicated that the copolymerization followed I Zipup (ZIP) template polymerization mechanism, which indicated the formation of the microblock structure again. Parameters such as pH and dosage that affected the flocculation performance, flocculation kinetics and the FTIR spectra of the generated flocs were investigated to further observe the effect of anionic microblocks on flocculation performance and understand the relationship between the flocs and flocculants. Flocculation experimental results demonstrated that the anionic microblocks in the template copolymer could enhance the charge neutralization and bridging ability, and therefore an excellent flocculation performance of treating high turbidity water was observed.

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Section: Introductionmentioning

confidence: 99%

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

et al. 2017

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“…The highest efficiency that could be attained was 42.5 %. The lowest final turbidity was 57.5 NTU at a dose of 6 mg l -1 of COL. An explanation is the steric hindrance that may take place between polymer molecules at high concentration (Hu et al, 2013). The poor performance of natural polymers when used as primary coagulants has been reported by other researchers (Hu et al, 2013;Zhao et al, 2013).…”

Section: Coagulation Performances Of Separate Coagulant and Coagulantmentioning

confidence: 92%

“…Some studies have investigated the use of tannin as a primary coagulant and coagulant aid in water treatment (Özacar and Şengil, 2002). Chitosan has also been investigated as a coagulant or flocculent for a wide variety of suspensions (Altaher, 2012;Zemmouri et al, 2012;Hu et al, 2013). A new coagulant aid called Enteromorpha extract was investigated for enhancement of coagulation performance (Zhao et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In an attempt to avoid the hazards of using metal salts as coagulants, more interest has been generated towards development of natural coagulants and coagulant aids (Amud and Amoo, 2007;Ugonabo et al, 2012;Hu et al, 2013;Yang et al, 2013). However, because most natural coagulants and coagulant aids are very expensive, it has become necessary to develop non-toxic, efficient, and low cost coagulant aids (Zhao et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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An agricultural waste as a novel coagulant aid to treat high turbid water containing humic acids

2016

Global NEST Journal

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Production of potable water from most raw water sources usually uses the coagulation/flocculation process to remove turbidity. Alum is widely used as a coagulant. However, there is concern about its associated risk of Alzheimer disease. As a result, there has been considerable interest in the development of natural coagulants and coagulant aids in order to reduce the dose of alum. This study aimed to evaluate the use of the Corchorus Olitorius L. (COL), a leaf vegetable grown in Africa and the Middle East, as a novel coagulant aid. COL has important advantages over other coagulant aids. It is an agricultural waste that is widely produced and does not require further chemical treatment. Tests were carried out to evaluate the optimal dosages and conditions required to achieve optimum removal of both turbidity and humic acid. Based on the results of jar test, COL is an efficient coagulation aid. It has the ability to reduce both the primary coagulant dose from 600 mg l -1 to 300 mg l -1 and the residual turbidity from 5.63 to 0.26 NTU. This novel coagulant aid also reduced the total organic carbon (TOC) concentration to zero level. It also increased the rate of flocculation.

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“…Among these downstream responses, the increased turbidity in rivers, which has both immediate and long-term adverse impacts on the public water supply, is the most important water quality issue associated with landslides in Taiwan. Peak turbidity inflow to a water treatment plant (WTP) that exceeds 10,000 NTU for an extended period of time may result in extended down time of water treatment facilities to carry out maintenance of fouled equipment, which, in turn, results in severe water service disruptions [8,19]. The long-term adverse impacts are dependent on the duration of the high-turbidity event and the turbidity baseline, which represents the non-disturbed status for individual catchments.…”

Section: Introductionmentioning

confidence: 99%

Modeling Typhoon‐Induced Alterations on River Sediment Transport and Turbidity Based on Dynamic Landslide Inventories: Gaoping River Basin, Taiwan

Chang

Harrison

Huang

2015

Water

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This study examines the impacts of storm-triggered landslides on downstream sediment and turbidity responses in the Gaoping River Basin, Taiwan using the Soil and Water Assessment Tool (SWAT). Attention is given to analyzing the increased and altered baseline of suspended sediment load and turbidity after the disturbances caused by the rainfall and landslides associated with Typhoon Morakot in 2009. SWAT parameters were calibrated by the observed hydrometric data from 1999 to 2003 using the log-scale root-mean-square error (log-RMSE) and Nash-Sutcliffe Model Efficiency. Both parameter sets were applied for the simulation of suspended sediment yield and turbidity with annual updated landslide inventories for the period 2004-2012. The landslide updating mirrors the physical land-cover changes and has slightly improved the model performance, yet landslides alone cannot explain the difference between Morakot-induced and SWAT-simulated sediment discharge. The set of parameters calibrated by log-RMSE can better approximate the increased baseline and typhoon induced alterations. The results show alterations in sediment erosion and transport: (1) drastically increased the turbidity baseline and occurrence of high-turbidity; (2) altered coefficient and exponent values of the sediment rating curve; and (3) altered relationship between rainfall and induced turbidity during major rainfall events. The research in this study provides an improved modeling approach to typhoon-induced alterations on river sediment loads and turbidity.

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Treatment of highly turbid water using chitosan and aluminum salts

Cited by 71 publications

References 32 publications

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

An agricultural waste as a novel coagulant aid to treat high turbid water containing humic acids

Modeling Typhoon‐Induced Alterations on River Sediment Transport and Turbidity Based on Dynamic Landslide Inventories: Gaoping River Basin, Taiwan

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