THE EFFECT OF SAND FILTER CHARACTERISTICS ON REMOVAL EFFICIENCY OF ORGANIC MATTER FROM GREY WATER

Naji Abudi, Zaidun

	THE EFFECT OF SAND FILTER CHARACTERISTICS ON REMOVAL EFFICIENCY OF ORGANIC MATTER FROM GREY WATER
Al-Qadisiyah Journal for Engineering Sciences
Article 1, Volume 4, Issue 2, 2011, Pages 143-155 PDF (0 K)
Author
Zaidun Naji Abudi
Abstract
The specific goals of this study are to determine the optimum inflow to the filters (hydraulic loading rates) and media characteristic such as the effective size, the particle size distributions within the bed media. In addition to modify the traditional slow sand filter to gain better flow control to treat grey water of high turbidity. Three set of experiments were carried out during nine months from April to December in Mustansiryiah University, college of engineering, environmental hydraulic laboratory. The first set of experiments were achieved by using (1m height) sand of effective diameter 0.35 mm, uniformity coefficient, UC=2.2 and porosity (39%), the second set of experiments were carried out by using sand of 0.75mm diameter, UC= 2.9 and porosity (43%) to study the effect of grain size of sand on water head over sand surface and removal efficiency. While the other set of experiments were done by using (0.7m height) sand of effective diameter 0.35 mm, UC=2.2 and porosity (39%) to study the effect of filter height of sand on removal efficiency. Measurements of chemical, physical and bacterial parameters were achieved during nine months from April to December. These parameters include turbidity, pH, PO4-2, BOD5, COD, TDS, TSS, and coliform removal for treated grey water. Results show that filter loading rate has been determined to be not more than 680 L/hr/m2 which removal efficiency of BOD5 was (51%) and minimum filter loading rate has been tested to be 212 L/hr/m2 which removal efficiency of BOD5 was (83%).
Keywords
Slow Sand Biofilter; Grey Water; BOD; COD; Effective Diameter

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