| Since 1990s, terrorist attacks have rapid and serious prevalence tendency in the globalscope, which are with making terror as the means to achieve political, social and personalmotivation purpose. The purposes of terrorist activities are making social panic, endangeringpublic security or threatening state organs, international organization, which resort to severesocial harm behaviors, such as violence, destruction, threats, and other means to cause orintend to cause casualties, significant property damage, public facilities damage, socialdisorder and so on, and incitation, subsidization or other ways to assist the implementation ofthe above activities. At present, countries all over the world have basically developedprovisions of dangerous levels and corresponding warning system for robbery, kill,improvised explosive devices, the suicide bomb and kidnappings. However, anti-terrorismcareer has diversity. When compared to other terrorist attacks, especially chemical andbiological terrorist attacks, because of its uncertainty, imperceptibility and uncontrollability,corresponding measures are particularly important. The forms of biological terrorist attacksmainly are some pathogenic microorganisms. Moreover, chemical terrorist attacks are toxicchemicals including heavy metals, etc. In application respect, they take food, water and so onas carriers.Therefore, the research should aim at biological and chemical terrorist attack and thetechnology that can be suitable to control of large areas easily. Based on the realisticbackground, in the aspect of controlling microbial sterilization, because chlorine dioxide hasstrong oxidizing, it is a kind of environment-friendly sterilization disinfectant that hasefficient broad-spectrum sterilization performance and low toxic byproducts and is listed asA1 level security sterilization disinfectant by the world health organization (WHO). So, thispaper discusses bactericidal effect of chlorine dioxide on microorganisms. In the aspect ofprevention and control of heavy metal pollution, Ultra-fine magnetic iron oxide has small size, magnetism of iron, easily dispersed, good weather resistance, light resistance, UV absorption,shielding effect and so on. Therefore, this article takes heavy metal waste water of the militaryprinted circuit board as study purpose and the main research contents are as follows:⑴Using the reaction of hydrochloric acid or sulfuric acid and sodium chlorite toprepare ClO2and applying spectrophotometry to determine ClO2concentration.⑵Preparing 3D flower-like Ultra-fine Fe2O3particles and carrying out its relatedcharacterization. Characterization results show that the particles have a porous, permeablestructure and can effectively remove heavy metals in water to purify water.⑶Studying the bactericidal effect of ClO2. On the one hand, taking grapes as microbialcarriers, we study the bactericidal effect of ClO2on corruption pathogen inoculated on thesurface of the grape -Botrytis mold, Penicillium and Alternaria mold. The results show thatClO2gas can effectively kill microorganisms on the surface of grape to guarantee foodsecurity. On the other hand, we take liquid ClO2to deal with sewage , compare the effect offactors on the bactericidal effect, and conclude that the effect of factors can be sorted asfollows: reaction time>temperature> ClO2dosage>whipping speed. However, pH value haslittle change.⑷We study removal effect of the ClO2on organic matter in water. The results showthat ClO2dosage, reaction time, pH and the concentration of COD in water have directimpacts on removal efficiency of organic matter. We also study removal effect of Ultra-fineFe2O3on Cu2+in water and influencing factors. Taking PCB wastewater for instance, westudy the combined " ClO2+ Ultra-fine Fe2O3" process. Treated wastewater effluent achievesthe national emission standards.
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