Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-IV-5ENVIRONMENTALLY FRIENDLY PROCESS FOR PESTICIDESREMOVAL FROM WASTE WATER WITH THE FOLLOWINGOXIDATIONG. Torosyan 1 , Ivet Danial 1 , Alireza Azadlaleh 1 , Seyed Ehsan Huseyni 1 ,S. Harutyunayan 2 , D. Hovhannisyan 31 State Engineering University of Armenia, 105 Teryan, 0009 Yerevan, Republic of Armenia;2 Yerevan State Economic University, 128 Nalbandyan, 0025, Yerevan, Republic of Armenia3 Yerevan State University of Architecture & Construction, 105 Teryan, 0009 Yerevan,Republic of Armenia.Nowadays the problem of removal of hydrocarbons from wastewater stream is becomingmore actual. The concentrations of hydrocarbons, particularly of pesticides in wastewater areincreased rapidly due an agricultural development. Some pesticides have been identified ashuman carcinogens.Pesticides cannot be removed by conventional gravity separation technology. One of thebest method for wastewater treatment from organic pollutants, in particularly pesticides, is anapplication of inorganic and organic adsorbents [1]. Current treatment processes usuallyinvolve also biological degradation or chemical oxidation of the waste organics.It is known, that adsorbtion of hydrocarbons having p-electronic bonds – aromatic andunsaturated (alkenes), decreases at transition from naphthalene to one-nuclear benzene andalkenes. At last, the adsorbtion of cyclanes (which molecules have no p-electronic bonds)becomes first very small and, secondly, it changes a mark passing adsorbtive-azeotrope point.In this paper the results of researches on application of natural Armenian zeolites assorbents of pesticides (malathion, fenitrotion, cipermetrin) are presented.The adsorptive activities of zeolites at removal of organic substances fromtetrachloromethyl solution (CCI 4 ) were investigated previously [2]. It has appeared thatphenol removal is better on H-mordenite.During this study it was found that the best adsorption of pesticides was achieved onzeolites which have H-sites in continuous-flow stirred-tank reactor (CSTR). The hydrogenbond is the reason of association in water solutions. Such bond is shown during the sorptionon adsorbents, containing on a surface hydroxilic groups. The molecules of benzene andtoluene can not penetrate in a cavity of zeolites such as 5Å (a cavity makes approximately 4-5Å), but freely will penetrate in a cavity of zeolites such as ZSM (a cavity makesapproximately 7.5Å and more). Adsorption of the pesticide molecules of water practically404