Based on the result of suitable filter screening A recirculation filtration process with multi-medias was applied to investigate the reactor performance in treating reclaimed water resource supply-type lake water. The results showed that the pollutant removal capabilities for single species packing filter was in the following order: activated carbon> composite inorganic medium>volcanic rock>quartz sand>gravel. A pilot scale test has been carried out using the recirculating filtration process with volcanic rock, composite inorganic medium and activated carbon media. And the removal efficiencies of CODCr TP Chlorophyll a. UV254 UV410 and Turbidity attained 66% 70% 90% 65% 72% and 83% respectively, while the circle period was 14 days and the filtration rate was 10m/h~13m/h. Moreover, the composition of dissolved organic matter (DOM) was analyzed by the excitation-emission matrix EEM .The fluorescent components in the lake water DOM were mainly aromatic protein (Peak A and Peak E), humic-like fluorophores (Peak C) and fulvic-like fluorophores (Peak D) in which the aromatic protein fluorophores A and E occurred at 230/344nmand 280/360nm, respectively. The fluorophores intensity of the characteristic fluorescence peaks varied significantly indicating that the concentration of DOM varied with the wastewater treatment process.
In this paper, industrial recycling cooling water system of a thermal power station in Beijing was selected. This system was made up by urban reclaimed water since 2007. The growth of heterotrophic bacteria was analyzed. Spring and summer test results showed, both in make up water and cooling water, the total numbers of heterotrophic bacteria in summer were all much higher than theirs in spring. The total number in summer exceeded the standard. Test results on different points in the circuit showed that, whether in spring or summer, the total number of heterotrophic bacteria in condenser was the largest. Therefore, more strict measures should be taken to control growth of heterotrophic bacteria in summer.
Keywords-reclaimed water, recycling cooling water, heterotrophic bacteriaI.
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