Abstract
Control and monitoring of water sources from different types of contaminants especially collection and proper wastewater discharge is very important, in Iran which is considered as one of the dry regions in the world. Undesired quality of wastewater treatment plant’s (WWTPs) effluent causes many environmental problems.In this research the parameters of Biochemical oxygen demand, Chemical oxygen demand, Total solids, Total suspended solids, Total dissolved solids, Potential of Hydrogen, Mixed liquor suspended solids, Mixed liquor volatile suspended solids, Sludge volume index, and temperature are examined based on the book of Standard Methods. The results of analyzing the above parameters which are related to eight WWTPs effluent out flow in Tehran, were analyzed by SPSS and Excel soft wares. The achieved data were compared to the standards of Iran’s Environmental protection agency. The results has shown that the parameters of Potential of Hydrogen, Chemical oxygen demand, Biochemical oxygen demand, and Total suspended solids of WWTPs effluent in Tehran are in accordance with standards of Environmental protection agency which are respectively 97.5%, 95.8%, 96.1%, 68.8%.WWTPs of C has also the best operation among other WWTPs. In this study, due to ethical considerations, the name of the WWTPs is not mentioned. The names of the WWTPs are marked with A–H.
Highlights
According to the studies on mentioned wastewater treatment plants, the cause of high rate of Sludge volume index (SVI) and low rate of Mixed liquor suspended solids (MLSS) is as follows: Firstly, the percentage of return sludge was low and if it reaches 100–150 percent, the problem will be solved to large extent
We can say that the SRT is low due to short intervals in discharging the sludge, where as in extended aeration systems, the produced sludge was insignificant and it should be disposed at long intervals
The parameters of pH and Biochemical oxygen demand (BOD) in this research are in concordance with studies of Torabian but the Total suspended solids (TSS) parameter in Torabian’s study was standard, where as in this research for the reason of increase in population during the time and having overloads in input level and decrease in treatment time, the amount of TSS output at wastewater treatment plant (WWTPs) of E–H appears higher than standard level
Summary
Untreated wastewater or wrong treatment will transfer the pathogens as well as polluting the sources of freshwater and will cause new limitations for the societies. Increasing growth of the population has added the volume of the wastewater and the problems of discharging them in the environment will enter a more critical stage. This matter has caused problems for the existing wastewater treatment plants. In case of wastewater treatment, the problems of environmental pollutions such as sudden decrease of oxygen at the discharge point of wastewater treatment, Eutrophication, foam creation and death of hydras will be controllable [5,6]
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