Reduction of Quantity of Excess Activated Sludge in Treatment Plant with Integrated Activated Sludge System
Gasiorek J., Institute of Natural Fibres, Poznan, Poland
This paper presents results of laboratory-scale anaerobic treatment studies of the stabilization (mineralization) process with and without desulfurication of waste activated sludge. The excess activated sludge were derived from two wastewater treatment plants. The anaerobic first stage of the treatment system proceeded in a fermentation reactor in the presence of native population bacteria and additionally the same process with sulfate-reducing bacteria, e. g. Desulfovibrio desulfuricans. The stabilization process of the excess activated sludge with desulfurication brought about 60 wt % decrease of total quantity of the sludge forming at the treatment plant. During the sludge stabilization with desulfurication process carried out to volatile fatty acids form e. g. acetic acid. The residual sludge with very low heavy metal ions content can find application to agriculture. The liquid product, after removal phosphates and ammonia with magnesium oxide to struvite form MgNH4PO4 and following heavy metal ions removal with natrium hydroxide, can be used in the treatment plant as an available carbon source for microorganisms capable to removing nitrogen and phosphorus during wastewater treatment. The studies presented in this paper are a part of the recycling project called ITP (Integrated Treatment Plant) which consists in including the desulfurication process into the technology of wastewater treatment unit with activated sludge.
Gasiorek Jan, Department of Environment Protection, Institute of Natural Fibres, ul. Wojska Polskiego, 71B, Poznan, 60630, Poland. Fax (061) 841-78-30. E-mail
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