Evaluation of Powdered Activated Carbon Efficiency in Removal of Dissolved Organic Carbon inWater Treatment

Materials and Methods: The increase of PAC for DOC reduction has done in three paths in the Isfahan water treatment plant (WTP). These paths including: 1) Intake up to entrance of WTP 2) Intake to exit ofWTP 3) Between entrance and exit of waterworks. The paths were simulated by the Jar test system. Then DOC and UV254 absorption were analyzed and SUVA parameter for samples and activated-carbon adsorption isotherm was calculated. Results: The injected PAC doses of 20, 40, 60, 80 and 100 mg/l caused decreasing in

Evaluation of Crude Oil Toxicity in Zayandehrud Dam and Water Treated from Isfahan Water Treatment Plant Using Daphnia Magna and Bioassay

Crude oil is a very complicated composition and contains thousands of hydrocarbons with different structures. This study measured LC50 of crude oil in water samples taken from zayandehrud dam and treated water from Isfahan water treatment plant with different chemical and physical characteristics. Different crude oil concentrations (5 to 100 mg/l) were prepared in water samples that each contains ten Daphnia. The numbers of live Daphnia were counted 4, 24 and 48 hours after adding different crude oil concentrations. The results showed that at low turbidity and TDS, crude oil was much more toxic to Daphni