Advanced treatment of swine wastewater using an agent synthesized from amorphous silica and hydrated lime.
ENVIRONMENTAL TECHNOLOGY(2014)
摘要
Advanced treatment using an agent synthesized from amorphous silica and hydrated lime (M-CSH-lime) was developed and applied to swine wastewater treatment. Biologically treated wastewater and M-CSH-lime (approximately 6w/v% slurry) were fed continuously into a column-shaped reactor from its bottom. Accumulated M-CSH-lime gradually formed a bed layer. The influent permeated this layer and contacted the M-CSH-lime, and the treatment reaction progressed. Treated liquid overflowing from the top of the reactor was neutralized with CO2 gas bubbling. The colour removal rate approximately exceeded 50% with M-CSH-lime addition rates of >0.15w/v%. The removal rate of PO43--P exceeded 80% with the addition of >0.03w/v% of M-CSH-lime. The removal rates of coliform bacteria and Escherichia coli exceeded 99.9% with >0.1w/v%. Accumulated M-CSH-lime in the reactor was periodically withdrawn from the upper part of the bed layer. The content of citric-acid-soluble P2O5 in the recovered matter was >15% when the weight ratio of influent PO43--P to added M-CSH-lime was >0.15. This content was comparable with commercial phosphorus fertilizer. The inhibitory effect of recovered M-CSH-lime on germination and growth of leafy vegetable komatsuna (Brassica rapa var. perviridis) was evaluated by an experiment using the Neubauer's pot. The recovered M-CSH-lime had no negative effect on germination and growth. These results suggest that advanced water treatment with M-CSH-lime was effective for simultaneous removal of colour, PO43--P and coliform bacteria at an addition rate of 0.03-0.15w/v%, and that the recovered M-CSH-lime would be suitable as phosphorus fertilizer.
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关键词
amorphous calcium silicate hydrate,colour removal,phosphorus removal,coliform removal,swine wastewater
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