Evaluation of Bursa municipal wastewater treatment plants performances by statistical methods


Thesis Type: Postgraduate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: AYŞE GÜNEŞ ÇEPNİ

Supervisor: ARZU TEKSOY

Abstract:

Bursa is one of the most densely populated cities in Turkey and it has many industrial production areas. Wastewater which comes from the east and the west parts of the city, is depurated by either Bursa East or Bursa West Wastewater Treatment Plants. Both plants use advanced biological treatment processes and are capable of removing nitrogen and phosphor from wastewater. Since the operating system of wastewater treatment plants is flexible and dynamic, data analysis helps to understand the process and to check the operational mistakes. In this thesis, effect of seasonal changes on plant performance between 2009 and 2013 were analyzed in terms of pH, conductivity, BOD5 (biochemical oxygen demand), COD (chemical oxygen demand), AKM (suspended solids), total nitrogen TN) and total phosphorus (TP) values measured from influent and effluent waters. It was investigated whether there is a difference in plant efficiency according to the seasons using the recovery efficiencies. In addition, treatment efficiency of the plants were tested statistically in order to compare plant performences through years. Variables were tested by Shapiro-Wilk method for normal distribution and homogeneity of variances were tested by homogenity test. Non-parametric statistical tests were used because the data did not show normal distribution. Kruskal-Wallis H and Mann-whitney U tests were used to compare groups. Bonferroni correction was applied before multiple comparisons. Significance level was accepted as α=0,05. SPSS (Statistical Package for the Social Sciences)was used for statistical analysis, MINITAB software was used for boxplot diagrams.