THE REVIEW STUDY ON REMOVAL OF PESTICIDES IN PHOTOCATALYSIS AND BIOLOGICAL TREATMENT HYBRID PROCESS

Abstract

   Pesticides, which are aromatic, hardly degradable under environmental conditions, leading to stable organic contaminants are transported to the atmosphere, water systems, food chain, and can accumulate at far distances from their original sources. Novel treatment technologies are required to eliminate pesticides from contaminated waters due to ineffectiveness of the conventional treatment processes for pesticide removals. In recent years, combined photocatalytic-biological degradation is a promising alternative to eliminate contaminants not treatable by conventional techniques from water systems: Photocatalysis converts toxic organics into biodegradable products, while biodegradation efficiently mineralizes the products. In order to avoid unnecessary chemical and 60% energy consumption during pre-treatment, the percentage mineralization in the pre-treatment step is minimized and the operating cost is reduced. According to the literature, while only about 80% pesticide degradation and less than 50% mineralization can be observed by the chemical process, a completely degradation and about 90% pesticide mineralization can be obtained with hybrid reactor system. The aim of this review is to evaluate handling and examining fundamentals, mechanisms and recent studies in the literature within scope of pesticide removal conditions accordance with individual photocatalysis and/or biological treatment methods.

Keywords

• Hybrid,advanced oxidation processes (AOPs),catalysis process,organic pollutants,new generation water / wastewater treatment methods

FOTOBİYOKATALİZ YÖNTEMİ KULLANILARAK PESTİSİT GİDERİMİ-DERLEME ÇALIŞMASI

Öz

   Aromatik yapılı, çevresel koşullarda zorlukla parçalanabilen, kararlı organik kirleticilerin başında gelen pestisitler, atmosfere, su sistemlerine, besin zincirine taşınmakta, asıl kaynaklarından çok uzak noktalarda birikebilmektedir. Konvansiyonel arıtma proseslerinin pestisitlerin gideriminde yetersiz kalmasından dolayı kirletilmiş sulardan uzaklaştırılmaları için yeni arıtım teknolojilerine ihtiyaç duyulmaktadır. Son yıllarda, su sistemlerinden konvansiyonel tekniklerle arıtılamayan kirleticilerin giderilmesinde birleşik fotokatalitik-biyolojik arıtma umut verici bir alternatiftir: Fotokataliz toksik organikleri biyolojik olarak parçalanabilir ürünlere dönüştürürken, biyolojik parçalama ürünlerini verimli şekilde mineralize eder. Ön arıtma sırasında gereksiz kimyasal ve %60 oranında enerji sarfiyatından kaçınmak amacıyla ön arıtma basamağında mineralizasyon yüzdesi minimalize edilerek çalışma maliyeti düşürülür. Literatüre göre yalnız kimyasal prosesle yaklaşık %80 pestisit parçalanması ve %50’den az mineralizasyon gözlemlenebilirken hibrit reaktör sistemiyle tamamen parçalanma ve yaklaşık %90 pestisit mineralizasyonu elde edilebilmektedir. Bu derlemenin amacı, fotobiyokataliz işleminin, bireysel fotokataliz ve/veya biyolojik arıtma yöntemlerine göre pestisit giderim koşulları kapsamında, temellerini, mekanizmalarını ve literatürde yer alan güncel çalışmaları ele almak ve incelemektir.

Anahtar Kelimeler

• Hibrit,ileri oksidasyon prosesleri (İOPs),kataliz işlemi,organik kirleticiler,yeni nesil su/atıksu arıtma yöntemleri

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