کیفیت شیمیایی

Physical and Chemical studies indicate that hydrochemical facies of Ziarat River, one of the drinking water resource, are (Ca-Mg -HCO+2; Cl3 - HCO3 -Ca-Mg). According to hardness classification, water class of Gorgan's drinking water isvery hard. While, the total dissolved solid of Gorgan's drinking water is rock-dominance, according to Gibbs classification. Regarding the present physical standards of drinking waters, turbidity is one of the most important parameters of the rivers which are used for drinking water. A several year evaluation of Ziarat River showed that the turbidity this river has been between 185-2572, prior to entrance to WTPG. High fluctuation of Ziarat River turbidity is due to flood nature of this river, so that turbidity of water manifest higher amount in 1378 compared to the following years. Regarding intensive erosion and sedimentation in the Ziarat watershed, in order to decrease the turbidity of water as well as consumption of chemical catalyzes in the WTPG, managements of watershed and construction of several pre-depositional ponds for collection of sediments in entrance of Ziarat River to the WTPG are recommended.

Using of organic waste resources especially municipal wastewater sludges for improvement of agricultural soils’ fertility is increasing, but in order to decrease environmental and health risks sludge must be stabilized before using in farms. Nowadays, vermicomposting process has been considered for stabilizing organic wastes. As, there is contravercial reports about concentration of nutrients (P,.K.N), organic matters and C/N ratio in vermicomposts, this research study is performed to determine concentration of nutrients organic matters and C/N ratio in vermicomposts derived from municipal wastewater sludge The concentration of nutrients in manure and vermicompost was compared with each other.Eighty five percent of dewatered raw sewage sludge and %15 bulking agent were mixed to provide earhworms’ food for a one month period. Concentrations of volatile orgainic matters, total nitrogen, total phosphorous, total potassium, Ash and pH in initial substrate and vermicomposted sludge were determined by dry agitation., macrokageldal, colorimetery, flamephotometery, Gotas, modifled Burian and Erhart methods, respectively. Concentrations of organic matter, nitrogen phosphorous, potassium, pH and C/N ratio in vermicomposted sludge were %36.42, %1.04, %0.11, %0.62, 7.5 and 22.62 respectively. The obtained vermiocompost is a suitable organic amender for fertilizing of agricultural soils.