Statistical Analysis of the Physicochemical Characteristics of Urban Wastewater Treatment Plants from Romania

Abstract

The analysis of several criteria for influent and effluent of urban sewer water treatment plant in south and south east of Romania, has a crucial role in establishing the correlations between these factors, and furthermore to assess the efficiency of the treatment system. Increasing urbanization degree and its complexity has made studies of the pollution impact appraisal to be a necessity. The mean values of the parameters measured from the wastewater plant influent like temperature, pH, suspended solids, chemical oxygen demand and biological oxygen demand vary from 17.13 � 0.23�C, 7.68 � 0.04, 234.72 � 1.55 mg/L, 396.42 � 0.76 mg/L, and 190.29 � 15.23 mg/L, respectively. The values of the above-mentioned quality indicators after the water treatment are 17.11 � 0.14�C, 7.56 � 0.03, 22.6 � 1.02 mg/L, 62.95 � 0.16 mg/L and 20.49 � 9.06 mg/L. Correlation study intended to define the feasible dependence among the evaluated parameters indicated that there were positive and negative correlations between the influent and effluent. The study conclusions point out the certitude that exist major optimizations in wastewater property after treatment processing.

Integrated Microalgae Cultivation for Sustainable Wastewater Treatment and Carbon Dioxide Bio-Fixation in Milk Factories

“…These parameters were analyzed using the standard method [29]. Correlations among the parameters were calculated with SPSS 26.0 software (applying Pearson and Spearman correlation coefficients) [30].…”

Saving Energy in Biological Wastewater Treatment by Using Extremely Low-Frequency Electric Field—Pilot-Scale Study

“…Wastewater treatment is of particular importance since it reduces the pollutant content below the concentration limits set by specific regulations for discharge into surface waters [38][39][40]. In order to not exceed the imposed pollution levels, different processes are applied in wastewater treatment plants, such as physical processes (filtration, sedimentation), chemical processes (pH correction, precipitation, etc.…”

“…Advanced purification is achieved by aerobic and/or anaerobic biological treatment. This implies the use of active sludge microorganisms [38,40,48,49] such as aerobic and anaerobic bacteria, microalgae, and molds [50,51]. These microorganisms metabolize the organic pollutants from the wastewater processed in the mechanical and chemical stages, including those containing nitrogen and phosphorus [52].…”