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Drinking water availability is a crucial problem that must be addressed in order to improve the quality of life of individuals living developing nations. Improving water supply availability is important for public health, as it is the third highest risk factor for poor health in developing nations with high mortality rates. This project researched drinking water filtration for areas of Sub-Saharan...
The removal of CODMn, NH4+-N from micro-polluted raw water were investigated by zeolite biological aerated filter process. Several selected test factors such as media height of BAF, hydraulic retention time(HRT), the air/water ratio and concentration of NH4+-N in raw water were studied in the article. The test Results showed that the removal rate of pollutants from the micro-polluted raw water would...
The aim of this study was to evaluate the effect of powered activated carbon (PAC) addition on algal water treatment by immerged ultrafiltration (UF) membrane, in terms of trans-membrane pressure (TMP) and permeate quality. Experiments were performed with a hollow-fibre polyvinyl chloride (PVC) ultrafiltration membrane at a laboratory scale, based on a time sequence of 120min filtration and 1min backwashing...
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...
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...
In the present article, the treatment of groundwater containing Fe(II) has been investigated. The oxidation processes were mediated by specific bacteria, namely the Leptothrix ochracea and Gallionella ferruginea, which belong to the general category of iron oxidizing bacteria. This work was focused on the characterization of the products of biological oxidation and to the examination of the kinetics...
The Partnership for University Research Abroad (PURA), a group of interdisciplinary students at the University of Virginia, has formed a partnership with Tzununa, a community on the shores of Guatemala's Lake Atitlan, to address its water quality needs. Faced with the need for a water filtration system, Tzununa has consented PURA's implementation of a point-of-use water filtration system. Utilizing...
In this paper, the characteristics, size distribution and influencing factors of carbon fines and symbiotic relationships between attached bacteria and fines were detected and analyzed under traditional process conditions. The STXM measurement could be used to judge carbon fines. The number of fines in the GAC effluents during the filtration cycle contented a trend of rise first then fall. And the...
Aerated filter packed with natural zeolite was applied to treat low polluted surface water in a pilot experiment. The removal of NH3-N, permanganate index and turbidity were analyzed, and the performance under different HRT was introduced based on the index derived from ?? theory and fuzzy mathematics method. Experimental results indicate that HRT had different effect on the removal of NH3-N, turbidity...
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...
Plant study on the ecological variation characters on bioaugmentation activated carbon was conducted, and the results show that when the operation time does not exceed 72 h in every backwashing cycle, bacteria on activated carbon immobilize firmly and the bacteria amount keeps relatively steady with (4~5) x 108 CFU/(gCarbon) in upper part and (2~3) x 108 CFU/(gCarbon) in lower part. But the bacteria...
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