Laboratory-scale investigation of wastewater purification in filters with dolomite chippings media

Abstract

The article explores the possibility of the vertical filter instead of sand used for more coarse media for recharging, which would reduce the risk of freezing and clogging and ensure the cleaning of wastewater up to the limits. For this purpose the dolomite chippings have been chosen for research. It was equipped with two 0.2 m2 filters area: one of their models was 0.4 m dolomite chippings layer, liie other 0.8 m. They have been loaded by the wastewater after the primary cleaning in the septic system. Medium contamination in organic pollutants have been 358 mg 021/1, P 14.6 mg L"', N(otal 108.5 mg L"1, suspended solids 161.1 mgL"1, pH 7.8. Hydraulic load of the filters was 0.03 m3 m~2 d~l. Wastewater flowing through a vertical sand layer by an average of 98.2% of the organic pollutants to be detained. The average of effluent wastewater contamination of the filter was 22 mg O, L1. In the filter with dolomite chippings media can be cleaned wastewater with pollution reaches 500 mg O, L"'. The maximum load of organic pollutants is 14 mg O, L1. The tration path length to ensure wastewater cleaning up tolerance 0.8 m. In the filter with dolomite chippings media Ptota| is cleaned even 87.0%, Ntotal only 13.0% efficiency.