Removal of the organic pollution from the dairy wastewater of the collection station in the differently constructed sand filters

Abstract

In 2003 an experimental model of the dairy waste water cleaning facility was equipped for cleaning the wastewater of the milk collection station. We examined the possibilities to destruct the organic pollutants present in the dairy wastewater in the sad I of vertical and horizontal filtration. The pollution level of the dairy wastewater is from 2 to 4 times higher than that of the wastewater. The dairy wastewater was cleaned following the procedure: cleaning in the aeration-flocculation system-cea stage sand-reed filter. The pollution of the wastewater leaving the cleaning facility never exceeded the allowable norms. The average BOD. was -1 and the maximal value was 9.6 mg O, L1. The investigation revealed that the horizontal sand-reed filter with the filtratkr meters ensured cleaning of the dairy wastewater up to the allowable norms. The organic pollutants were cleaned with the err 97.2% after filtration through such a sand layer. In order to find out the possibilities of vertical filtration filters use for cleaning the dairy wastewater leaving the miiV ; stations, we performed a modelled investigation. The wastewater cleaning efficiency in respect to BOD5 reaches 99.3% in tkead i The calculation according to the regression equation received showed that filtration through 0.6 m sand layer ensuredsuccessful cleaning of the wastewater up to the allowable norms ...[et al.]