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Ozone has been widely used in drinking water treatment because of its high oxidation and disinfection capability. In order to make the ozone oxidation reliable, the structure of 3 sections of the ozone contactor was employed. By changing the operation conditions of the contactor, focused was on ozone transfer effect. The results showed the best operation condition of ozone transfer was downstream...
One of China largest river, Songhua River was polluted due to the explosion at a PetroChina factory in Jilin province in 2005. A full scale test was carried out to investigate the removal of nitrobenzene in the raw water from polluted Songhua River. The removal and control effects of nitrobenzene by using Powered Activated Carbon (PAC) absorption and Granular Activated Carbon (GAC) filtration as emergent...
Endocrine disrupters (EDCs) have caused great concerns for the safety of water environment and drinking water in recent years. This paper uses lab-cultured human breast cancer cells (MCF-7) to examine the changes of water estrogenicity during the drinking water treatment process and uses chemical analysis as supplementary information. The results showed that MCF-7 were extremely sensitive to the aqueous...
Endocrine Disruptors, which is trace but more and more noted in aquatic environment, has a significant effect on people's hormone systems. The estradiol (E2) was a research object, and the effects of solution parameters (concentration, pH, ionic strength and natural organic matter (NOM) ) on the retention of trace E2 by nanofiltration membrane (NF) (BDXN-90 polyamind aromatic compound membrane) filtration...
A combined O3/BAC (biological activated carbon) process for the removal of DBP(disinfection by-product) precursors from drinking water and maintenance of biological stability in distribution system is being investigated. The objective of this study is to evaluate removal of THMFP and AOC (assimilable organic carbon) during long term operation of an O3/BAC process. A pilot scale experiment for drinking...
Bio-stability and health security of drinking water have become basic requirements to protect human health. The conventional water purification process, which is composed of coagulation, sedimentation, filtration and disinfection, can not solve the problems of organic matters in the micro-polluted source water effectively. So the by-products generated in the chlorination disinfection increased the...
The performance of the slow sand filter was examined using the landscape water with the experimental period of 46 days. The filter installed was similar to the traditional slow sand filter; expect that the top 5-cm sand was changed to the quartz sand. In this study, the variations of the turbidity, COD, BOD and TN were measured based on the filtration rate of 0.2m/h. Results showed that the average...
Experiments on adsorption for phosphorus by activated carbon, zeolite and ceramisite were conducted. The results show that adsorption capacity order of three filter media from high to low is activated carbon, zeolite and ceramisite. Influential factors which affect the adsorption capacity were surveyed. According to the analysis, the first factor is that surface isoelectric point pH of activated carbon...
Study on coagulation-microfiltration combination process for treatment of Luan river water was carried out. The experimental results showed that when the dosage of FeCl3 was 35 mg/L, the removal of turbidity was above 95%, the organic matter was above 50%, and recovery of membrane flux reached 81% for the combination process. On the other hand, among the four coagulants (FeCl3, Polymeric Ferric Sulfate,...
This study investigated the effectiveness of packed tower to remove trihalomethanes (THMs) from drinking water. The results showed that the removal efficiency of total THMs generally exceeded 90% when temperature was 24??C, water temperature was 25??C, the hydraulic load was 20 m3/(m2??h) or lower, air-to-water ratio was 60 or greater. Among individual THMs species, the dichloromethane could be removed...
Cyclops of zooplankton propagated excessively in eutrophic water body and it couldnpsilat be effectively inactivated by the conventional disinfection process. In order to tackle this problem, a study of removal effect on Cyclops with oxidants in a drinking plant in China was conducted. Among five oxidants, chlorine dioxide was more effective against Cyclops and the potassium permanganate was the weakest...
Based on the pilot scale experiment in a Water Treatment Plant in South China and combined with molecular weight (MW) distribution of organic matter, this study mainly evaluated the removal effect of organic matter in different molecular weight, assimilable organic carbon (AOC) by using ozonation in combination with biological activated carbon (BAC). And influence of substance that is mutagenic is...
Cyclops of zooplankton propagated excessively in eutrophic water body and it couldn't be effectively inactivated by the conventional disinfection process. In this paper, a study of removal effect on Cyclops with oxidants in a drinking waterworks in China was conducted. Among five oxidants, chlorine dioxide was more effective against Cyclops and the potassium permanganate was the weakest with the same...
Highway runoff is one of the important water resources in urban areas, though severe pollution has curbed its direct use. In this study, a soil infiltration system is proposed for treatment of highway runoff. Bench-scale experiments with different inflow concentrations and system operation modes (continuous/intermittent) have been designed to simulate the highly varied inflow rate and pollution load...
Cyclops of zooplankton threatens the drinking-water security because of the massive propagation in the polluted water resource and the ineffective treatment by conventional purification technology. The inactivation effects on Cyclops in the raw water of the pre-oxidants, such as chloramines, chlorine, potassium permanganate composite (PPC) and ozone, were discussed. And the synergic removal effects...
In recent years, the occurrence and fate of antibiotics in the aquatic environment have been the subjects of many investigations in several countries. Tetracyclines (TCs) comprise an important group of pharmaceuticals in today's human and veterinary medical practice. However, they undergo slow degradation and transformation in the aquatic environment. The removal of tetracycline (TC) and oxytetracycline...
Removal of bromate by ferrous sulfate reduction was studied using water plant filter effluent spiked with bromate. Effects of FeSO4 dosage, reaction time, pH and DO concentration on bromate reduction were investigated. Removal of residue total iron by GAC was also studied. Results showed that, when initial bromate concentration is about 25 mug/L, pH is 7.2, DO concentration is 2.3 mg/L, temperature...
The removal efficiency and mechanisms of microcystins (MC-RR & MC-LR) from deionized water by ultrafiltration membrane(UF) were studied in the dead-end mode. The results showed that polyvinylchloride UF filtration alone could not efficiently and consistently remove microcystins, the rejection decreased over time from 26%(MC-RR) .. 42%(MC-LR) to 2% , 10%, respectively. The influence of relevant...
Two different granular activated carbon (GAC) filters were utilized to investigate the removal efficiency of bromate and natural organic matters (NOM) during the transition from fresh GAC to the biological activated carbon (BAC). The removal efficiency of bromate, nitrate, UV254, DOC, and trihalomethane formation potential (THMFP) in GAC filter apparently decreased during the transition from fresh...
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