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The anaerobic digestion of New Zealand low-input dairy farms has previously been evaluated for energy production, but farming systems have recently become more intensive with increased feed supplementation and feed replacement; therefore, we are studying how these changes affect the overall energy production for water heating. A combination of literature review, surveys, chemical analyses

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Subsequently, the vials were cooled to 120 °C and measured COD (mg/L) with a DRB 200 reactor. The SS was performed following the photometric method (HACH method 8006) and 10 mL of blended sample was taken into a sample. Subsequently, the sample cell was placed in the cell holder and the SS was measured using a spectrophotometer (HACH DR 2800).

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In order to qualify and quantify the impact of sediment contamination in hydric settings by metallic trace elements (MTE) emanating from the controlled dump of Fez city (northern Morocco), leachate and sediment sample analyses were carried out. The leachates collected from the 24 sites are characterised by a pH between 6.91 and 8, a COD varying between 430.7 and 7962 mg/L, an NTK content up to

COD is most suitable for rapid and frequent monitoring of treatment plant efficiency and water quality. This method is more accurate than BOD (with a 5-10% relative standard deviation) and it offers a relatively short analysis time (2-hour digestion time), compared to the 5-day BOD test.

The BOD concentration in untreated and treated PORE was determined by using the HACH respirometric method (HACH method 10099). Ten mL of untreated or treated PORE were taken into the BOD track sample bottle and filled with deionized water.