This study aims to clarify the distribution of groundwater qualitative characteristics in Daqouq district within Kirkuk governorate, the study included 14 wells that were selected in the area located in the southern part of Kirkuk province, and which included different activities such as agricultural, industrial and residential to the north in the Daqouq district. Water samples were collected from the wells once every two months from December 2016 to April 2017. The physical tests were performed such as electrical conductivity, total dissolved solids and chemical tests that included pH, cations such as calcium and magnesium, anions such as sulphates, nitrates and chlorides and concentrations of trace elements such as lead, cadmium and zinc were measured using standard methods. The three- dimension contour maps were drawn to illustrate the distribution of the above properties in the study area. The wells showed that the highest rate of electrical conductivity was 1600 μs/cm in W4 and the highest concentration of calcium in W5 was 260 mg/L and the highest rate of lead was 2.2 μg/L in W13, and they showed that the difference in the quality of water was according to land use, agricultural, residential or industrial, in the properties of electrical conductivity, total dissolved solids, nitrates, chlorides, and trace elements.

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This study aimed to investigate the effect of total suspended solids (TSS) on the performance of a continuously operated dual-chamber microbial fuel cell (MFC) proceeded by primary clarifier to treat actual potato chips processing wastewater. The system was also tested in the absence of the primary clarifier and the results demonstrated a significant effect of TSS on the polarization curve of the MFC which was obtained by operating the graphite anodic electrode against Ag/AgCl reference electrode. The maximum observed power and current densities were decreased form 102.42 mW/m2 and 447.26 mA/m2 to 80.16 mW/m2 and 299.10 mA/m2, respectively due to the adverse effect of TSS. Also, the internal resistance increased from 40 to 70Ω.

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