The effect of reducing the air basin on concentration phosphate (orto, total), nitrate and nitrite ions waste water treatment

In this study, the amounts of phosphate, nitrate and nitrite ions in a domestic wastewater treatment plant were evaluated. The six-month study period, from winter to summer and twice per month, sampling from both influent and effluent was performed following analysis of samples using simple, valid and developed spectrophotometric method. The effective parameters on the amounts of nitrate, nitrite and phosphate ions such as pH, MLSS, MLVSS, DO, BOD5, COD, F/M, and T were investigated.Under the optimum conditions, the calibration curve was linear in the range of 0.1-1.0 mg L-1 (R2 =0.999). The results wereshown that, in the timeframe of this study, the efficiency of treatment process was much better before stopping because of appropriate food to microorganism ratio (F/M). In other words, at this stage, nitrification was performed properly and phosphates were removed from the system to a large extent.The percentage of elimination of COD and BODs was acceptable while analyzing.