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2-methylisoborneol (MIB) and geosmin cannot readily be removed by conventional water treatments. Ozonation biological activated carbon (O3-BAC) process is an attractive option for MIB and geosmin removal. For MIB and geosmin with an initial concentration of 500 ng/L, the removal efficiencies of MIB (geosmin) by ozonation, biodegradation and activated carbon adsorption were 51% (73%), 19% (17%) and...
Phosphorus is one of the key elements necessary for the growth of microorganism in drinking water. It stimulates the growth and/or regrowth of microorganism and reduced biostability in drinking water. The demand for effective and inexpensive technology is to increase in response to the widespread recognition of the deleterious health effects of microorganism risk in pipe network. In this study, activated...
Studied was the comparison of ozone-biological activated carbon (O3-BAC) and granular activated carbon (GAC) processes for advanced drinking water treatment. The effects by O3-BAC and GAC were evaluated based on the removal of the indexes including CODMn, UV254, TOC, BDOC, NH4+-N, NO3--N and NO2--N. The results showed that the treatment effect by O3-BAC was better than that by GAC alone. When ozone...
For the advanced treatment of drinking water by activated carbon, the effects of adsorption on removal of dichloroacetic acid, dibromochloromethane, benzene and carbaryl in water, as well as the competitive adsorption between these pollutants were investigated with three different activated carbon (new carbon, regenerated carbon and used carbon). The results showed that good effect of the adsorption...
The formation of bromate by ozonation-biological activated carbon process is a problem of drinking water treatment. By pilot test, the influence of bromide ion concentration, contact time of ozone column, ozone dosage, Ct value, changes of water quality and adsorption time of activated carbon column on bromate formation and control were investigated. The results showed that when [Br-]=100~500??g/L,...
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...
For drinking water companies, it is important to predict the lifetime of granular activated carbon (GAC) for the removal of pesticides. Full-scale experiments in pilot GAC filters are expensive and time-consuming, but fast laboratory experiments do not have the accuracy necessary for a realistic prediciton of the breakthrough curves of pesticides. The problems with these experiments and the models...
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