Abstract
The rational utilisation of sludge as organic matter application into the soil permits enrichment in nutrients such as nitrogen and phosphorus. As dairy sewage sludge contains large amounts of organic matter and minerals, utilisation of such sludge in agriculture appears to be a noteworthy proposal. However, such waste can also be a source of toxic substances, heavy metals, inhibitors, xenobiotics and potentially pathogenic microorganisms. Therefore, it is so important to monitor its microbiological and biochemical properties in aspect of the safety for human health, natural environment preservation and a suitable level of agricultural production maintenance. The objective of study was the estimation of selected microbiological, biochemical and chemical properties of activated sludge (AS) and waste activated sludge (WAS) originating from the dairy sewage treatment plant. Nitrification and ammonification rates, respiratory, dehydrogenases, acid phosphatase, alkaline phosphatase, protease and urease activities were at significantly higher levels in the WAS than in the AS. The pH value of the AS and WAS oscillated within the range of neutral reaction.
Highlights
The rational utilisation of sludge as organic matter application into the soil permits enrichment in nutrients such as nitrogen and phosphorus
The work fulfils the lack of knowledge about fungi occurrence in dairy sewage sludge which is rather poorly investigated comparing to other kinds of sludge
Aspergillus sp., Penicillium sp., Candida sp. and Trichophyton sp. were the most dominant fungi isolated from the waste activated dairy sewage sludge
Summary
The rational utilisation of sludge as organic matter application into the soil permits enrichment in nutrients such as nitrogen and phosphorus. As dairy sewage sludge contains large amounts of organic matter and minerals, utilisation of such sludge in agriculture appears to be a noteworthy proposal. Such waste can be a source of toxic substances, heavy metals, inhibitors, xenobiotics and potentially pathogenic microorganisms. Natural utilisation of sewage sludge is proper from the ecological point of view and has a favourable effect on the reclamation of degraded soils This approach of sludge utilisation affects positively the plant yields and reduces the use of mineral fertilisers—so it would be much more beneficial for the. That is why continuous monitoring of sewage sludge, as well as raw and digested dairy manure is necessary to preserve the high quality of sludge in order to safe agricultural application (Saunders et al 2012)
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