Removal of Chloridazon Herbicide From Wastewaters Using FE/H2O2, UV/H202 and UV/FE/H2O2
Production of sugar beets have shown 29% increment between 1988-2016 according to Turkish Statistical Institute. Accordingly, an increase in the use of pesticides has also been observed. Lambda-cyhalothrin, cypermethrin, imidacloprid, endosulfan, malathion, pyrimiphos-methyl and chloridazon are the commonly used pesticides for the control of beet crops around the world. Being one of them, chloridazon, also named as Pyrazon and classified as organochlorine pesticides, is the most widely used pesticide for sugar beets in Kastamonu which is the city contributing largely to Turkey’s Sugar Beets production. Chloridazon (5 -amino-4-chloro-2-phenyl-3(2H)-pyridazinon) is a pesticide found in powder form and it has a high solubility in water (approximately 400 mg/L). Studies showed that this herbicide ends up in surface and groundwater because of its high mobility. Due to toxic properties of chloridazon, it is obvious that if not removed from water sources it will cause serious problems on human health and ecological cycle. Recent studies showed that biological methods, adsorption and photo degradation are the methods used for the removal of chloridazon from wastewaters. However, these methods have some disadvantages with regard to the cost of treatment as well as the toxic characteristics of the chloridazon. On the other hand, to our knowledge, there is a limited numbers of studies regarding the removal of chloridazon using advanced oxidation processes (AOP’s) based on hydroxyl radical production. Therefore,in this study,removal of chloridazon using Fe/H2O2 (Fenton), UV/ H2O2 and UV/Fe/H2O2 (Photo Fenton) will be investigated.Chloridazon analysis will be conducted using HPLC. For the AOP’s to be studied, parametric analysis will be performed in order to determine the effects of parameters such as H2O2, Fe+2, and chloridazon concentration, UV light intensity and pH Furthermore, possible by-products of chloridazon degradation will be sought.
by H.Bike İÇEN
Investigation of Optimum Hybrid Treatment Techniques of Industrial Wastewaters of Organized Industries in Nilüfer River Basin
The Nilüfer River has its' spring within the borders of Bursa and flows into the Marmara Sea, while being heavily polluted by industrial wastewaters. As a result of the high exposure of the river to the wastewater discharges with different characteristics with different industries such as paint, leather, textile, automotive, food etc., the physical, chemical and biological balance of Marmara Sea is disrupted. Recently, the presence of a group of contaminants, identified as specific and priority polluters have been recognized as significant water polluters that have adverse effects on both human and wildlife endocrine systems. Natural attenuation and conventional treatment processes are not capable of removing these micropolluters which are reported to bioaccummulate in macro invertebrates, other organisms in the aquatic environment and humans beings. This research focused on the best treatment techniques for industrial wastewater from different industries (leather, textiles, olive oil, paint, metal, chemicals and oil etc.). Furhertmore, these best treatment techniques is evaluated according to their capital and operational cost. In this study, pollutants are specified with water analysis from the selected sampling points in Nilüfer River. Hence, it is also aimed to foresee which polluter is caused by which industry. In this context, these will guide the changes that the industry will make in their own processes in the future.
by Esat Arıtürk
Place: Department of Environmental Engineering, CZ-14