Classification of waste water and active sludge properties and evaluation of analysis methods

Monitoring and controlling of the treatment processes bases on the continuous determination of the waste water and activated sludge characteristics, and relates to the analysis of the samples taken from the raw waste water or treated waste water coming to the waste water treatment plants such as acidity (pH), temperature (T), conductivity (C), dissolved oxygen (DO), oxygen saturation (SO), salinity (SA), electrical conductivity (EC), chemical oxygen demand (COD), suspended solids (LSS), total nitrogen (TN), total phosphorus (TP), biological oxygen demand (BOD5) and the measurements made on the design parameters of the process for the samples of activated sludge used for biological treatment. These include ventilation time (AT), suspended solids concentration (MLSS) to be measured, suspended volatile solids concentration (MLVSS), temperature (T), sludge production rate (ASPR), solid retention time (RT) containing bio-kinetics (BK), and the rate of return (FBR). Determination of biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total organic carbon (TOC) and dissolved oxygen (DO) amounts are the most basic measurement criteria in terms of the characterization of waste water. In this study, the characteristics of wastewater and activated sludge have been classified in detail, the analysis methods to be applied to these characteristics and the data mining methods that can be used for statistical evaluation and modeling of the analysis data measured by these methods have been investigated, and the decision trees method has been examined in detail using the KIME data mining platform. When the analysis results of 7 selected parameters related to 334 domestic wastewater collected from the districts of Muğla province are analyzed; while the others can be performed in a very short time, the estimation of the BOD5 parameter, which takes 5 days to measure, has been studied. As a result, the BOD5 (biological oxygen demand) value distribution was found lower than 100 by 53 %. While the ratio of those with a BOD5 value between 100-200 is 15.3 %, the ratio of those with a 450-550 is 12.6 %.