ABSTRACT
Microbial quality, particularly parasitic characteristics in terms of effluent reuse in agriculture is one of themost important indices. The aim of this study is determination of removal efficiency of Kermanshah wastewater treatment [conventional activated sludge] and Gilangharb wastewater treatment plants [stabilization ponds] for cyst and parasitic eggs. In this study research samples were taken once in five days from both inlet and outlet of wastewater Plants within a period of five months. The identification and counting of cyst and parasitic eggs were carried out by Mac master slide according to Bailenger method. The findings shows that mean of parasitic eggs and protozoan cysts in effluent of Kermanshah wastewater treatment plant were 0.99 +/- 0.42 and 0.90 +/- 0.25 per liter respectively, indeed removal efficiency for parasitic eggs and cysts are%98.42 +/- 3 and%97.5 +/- 4.5 respectively, but, any parasitic eggs and protozoan cysts in Gilangharb wastewater treatment plant was not observed and removal efficiency of these tow parameters was%100. Ascaris lumbricoides eggs had most number in influent and effluent of both plants. As results show, removal efficiency for cysts and parasitic eggs in both abovementioned are desirable, and the quality of effluent treatment plant of both the rate of nematode eggs Anglbrg index [number of nematode eggs: 1 >/- number per liter] is consistent
ABSTRACT
Nowadays, to accelerate the process of turbidity removal in water treatment plants, the Accelator and Pulsator clarifiers are used. In this research, a comparison of the performance of these two systems in the TOC and turbidity removal as well as the consumption of chemicals in them is considered. In this study, 1,170 samples of raw water, effluent from clarifiers and filtered water were taken for nine months. Then turbidity; pH, alkalinity, Hardness, TOC and iron of the samples were measured. Saturation index [SI] was also calculated. Also the amount of consumed chemicals was recorded and the ratio of chemicals consumption to raw water turbidity and removed TOC was obtained. All sampling and examination procedures were conducted based on standard methods for the examination of water and wastewater. The results indicated that the removal efficiency average of turbidity in the study period [nine months] in the Accelator and Pulsator system obtained were 46.2% +/- 16.2% and 75.9% +/- 10.9% respectively. The removal efficiency of TOC in the Accelator and Pulsator system obtained were 9.5% +/- 1.8% and 68.5% +/- 12.3% percent respectively. The amount of consumed coagulants in Pulsator was 0.20-0.25 of its consumption, in Accelator system. Water quality of Pulsator effluent was, at last,more desirable than Accelator. According to the results the use of Accelator treatment systems compared with Pulsator in water treatment plants does not have a desirable quality for drinking water and also Causs increase in the cost of consumed chemicals