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Upgrading the effluent quality of an aerated lagoon with horizontal roughing filtration

Nabizadeh R., Naddafi K., Khazaei M., Fard R. F., Izanloo H., Yavari Z.

Environment Protection Engineering

2015

Vol. 41, nr 3

121--136

Removal of suspended solids and microorganisms from an aerated lagoon effluent with a horizontal roughing filter (HRF) was investigated. The aerated lagoon receives Qom municipal wastewater. The HRF was operated at three filtration rates of 0.5, 1.0 and 1.5 m3/(m2·h) during four month operation period. The measured values of turbidity, TSS, COD, pH, temperature and flow rate of HRF at the former filtration rate were 79±12 NTU, 100±11 mg/dm3, 190±12 mg/dm3, 7±0.1 °C, 17±8 °C and 0.82 dm3/min, respectively. The differences between inlet and outlet values of pH and temperature were not significant (P > 0.05). Measures turbidity, TSS and COD in HRF final effluent were 15±13.7 NTU, 37±295 mg/dm3, 64±39.7 mg/dm3, respectively, which corresponds to 81.1%, 63% and 66.3% removal efficiencies, respectively. A decrease of removal efficiency was observed upon increasing filtration rates. The Spearman correlation coefficients between the head-loss and removal efficiencies ranged from 0.578 to 0.968 pointing to a direct relationship. Results of modeling approach revealed appropriate compliance between the values of the observed and predicted TSS for higher filtration rates.

Impact of raw water quality on operation of variable declining rate filter plants

Zielina M., Dąbrowski W.

Environment Protection Engineering

2011

Vol. 37, nr 2

133-140

According to some numerical models of variable declining rate filters in a bank changes in raw water quality do not interfere with values of flow rates through filters as long as subsequent backwashes in a plant start always for the same water surface level above filter media. This simple operational rule was previously tested numerically. Now some results of experimental tests are also presented. Laboratory experiments confirm the operational rule predicted theoretically and supported by numerical computations.