| Water is an important resource for the subsistence of the mankind. While safe drinking water, in particular, imposes direct influence on our health. Faced with increasingly serious water pollution, current regular treatment on drinking water usually can not handle issues such as low killing rate of micro-organism, side effects of disinfectant on human health and secondary pollution caused by disinfection process. Advanced Oxidation Technologies, AOT for short, are new oxidation technologies which take advantage of highly activated Hydroxyl Radical (·OH) to analyze harmful subsistence. This technology has broad-spectrum bactericidal features, the speed of killing microorganism is extremely fast. It is a new generation disinfection technique for drinking water that avoids by-products and secondary pollution. However, most current research on treating drinking water by AOT is limited to theoretical research and lack of enlarged experimental progress. This thesis deals with the optimal treatment condition, the shortest treatment time and the greatest treatment capability in an enlarged experimental treatment system and aims to provide data for the application of AOT in drinking water disinfection field.This research is based on the platform of a1t/h drinking water experimental treatment system. A set of mature technological process experiments equipment is set up by constantly optimizing and improving raw material gas flow, power regulation mode and treatment system. Artificial water experimental water and natural water of various quality are being treated by disinfection under different reaction path, reaction time and concentration of reactive oxygen species. Get the following results:1. It can meet the needs of drinking water disinfection based on advanced oxidation technologies. In the artificial water experiments, the killing rate can reach100%when the TRO concentration is0.7mg/L and the bacterial concentration is104～106cfu/mL; When the bacterial concentration is105cfu/mL, turbidity is1～3NTU or TOC is0.279～2.65mg/L, the killing rate can reach100%. In the natural water experiments, in July when water quality is the poorest, if TRO=1.2mg/L, the microbial indicators can reach the state standard. 2. Compared with conventional methods, it is more faster to disinfect based on the advanced oxidation technology for treating drinking water. In the treatment of natural water, chlorine and chlorine dioxide disinfection technologies generally need to maintain the concentration of disinfectant at about1.5mg/L and the time is more than20min, while in advanced oxidation technology the dosage of reactive oxygen species is1.2mg/L. the reaction time is1min, the microbial indicators can reach the state standard.3. Both of water turbidity and organics concentration will effect on the disinfection by reactive oxygen species, but the organics concentration is the most serious factor. So in the treatment of dringking water disinfection with advanced oxidation technology, it can effectively reduce the water turbidity and organics concentration by filtration, micro flocculation and other methods and significantly improve the effect of drinking water disinfection based on the advanced oxidation technology. |
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