Studies On The Application Of Bactericides In Environment Protection And Remediation

With the improving of the people's life, people pay more attention on exercise andentertainment. More and more people like and enjoy swimming, and people's raising petssuch as cats and dogs are also increasing, but the poor water quality and pet's egesta mayimperil people's health. So the water quality of swimming pool and how to treat the pet'segesta become an important problem of environment protection. In this thesis, I havestudied on the removal of urea by using chlorine-based disinfectants and the application ofa new antimicrobial as a treatment of cat litter based on silica gel, some conclusions areobtained as following:1) The initial concentration of urea was a principal influential factor of ureadecomposition by using orthogonal experimental design, the better result would be gottenalong with adding the HTH chlorine-based disinfectant and action time, especially, theurea concentration would decrease obviously after 4 hours by adding HTH chlorine-baseddisinfectant.2) Sodium Dichloroisocyanurate (SDCCA) and Trichloroisocyanuric Acid (TCCA),usually release cyanuric acid when they are used for water treatment disinfectants inswimming pool, and this will reduce the decompsition rate of urea when the concentrationof cyanuric acid was over 50ppm. Accordingly we must consider other optionaldisinfectants to replace it in order to avoid cyanuric acid accumulating up to this limit.3) The on-site application of HTH chlorine-based disinfectant for Shanghai Mariotthotel showed that, not only urea but also other inspection items all met the requirementsof the China's national standard for the swimming pool.4) The adsorption tests implied that, polyvinyl pyrrolidone (PVP) can not adsorbany urea, while diatomite treated with hydrochloric acid had good adsorption and thecation exchange resin indicated excellent adsorption. The adsorption efficiency of cation exchange resin would still keep above 90% as compared with the first time adsorption afterrepeating 4 times.5) A new generation of cat litter cleaner made of cellular silica gel, treated withantimicrobial (PHMB), had a good performance of effective antibacterial on bacteria,the efficacy of antimicrobial on pathogenic organisms reached 99.8% and also had longterm efficacy of antimicrobial. The reports of the evaluation for cat litter cleaner made byinternational authority told us this kind of new cat litter cleaner would be a perfect pet littertreatment and it could remedy the ralser's habitation environment.Innovation in this thesis:1) The combination of the adsorption of cation exchange resin and the oxidation ofchlorine-based disinfectant can fast and effectively remove urea especially at highconcentration of urea in swimming pool, and make it meet the swimming pool standard.2) A new generation of cat litter cleaner based on silica gel and the antimicrobialPHMB has been developed with broad spectrum, fast-acting and long term antimicrobialeffect.