Advanced treatment of swine wastewater using an agent synthesized from amorphous silica and hydrated lime

• Published in: Environmental technology Vol. 35; no. 23; pp. 2982 - 2987
• Main Authors: Tanaka, Yasuo, Hasegawa, Teruaki, Sugimoto, Kiyomi, Miura, Keiichi, Aketo, Tsuyoshi, Minowa, Nobutaka, Toda, Masaya, Kinoshita, Katsumi, Yamashita, Takahiro, Ogino, Akifumi
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.12.2014; Taylor & Francis Ltd
• Subjects: adverse effects; amorphous calcium silicate hydrate; Animals; Applied sciences; Bacteria; Brassica rapa; Brassica rapa - drug effects; Brassica rapa - growth & development; Brassica rapa subsp. nipposinica var. perviridis; Calcium Compounds - chemistry; Calcium Compounds - toxicity; calcium hydroxide; Chemical engineering; coliform bacteria; coliform removal; Color; colour removal; decolorization; Enterobacteriaceae - isolation & purification; environmental technology; Escherichia coli; Exact sciences and technology; Fertilizers - toxicity; General purification processes; germination; Germination - drug effects; Influents; Lime; Metals, Heavy - analysis; Oxides - chemistry; Oxides - toxicity; Phosphates - analysis; phosphorus fertilizers; phosphorus removal; Pollution; Reactors; silica; Silicon Dioxide - chemistry; Silicon Dioxide - toxicity; slurries; Swine; swine wastewater; vegetables; Waste Disposal, Fluid - methods; Waste Water; wastewater; Wastewater treatment; Wastewaters; Water Pollutants - analysis; Water treatment and pollution; British Isles; Water treatment; Discoloration; Microbiology; Escherichia coli; Carbon dioxide; Waste water; Trophic chain; Swine; Pathogenic; amorphous calcium silicate hydrate; Bacteria; Agriculture; Reactor; Biological contamination; Ungulata; Enterobacteriaceae; Edible species; Fertilization; coliform removal; Phosphorus; colour removal; Coliforms; Fertilizers; phosphorus removal; Bubbling; Vertebrata; Mammalia; swine wastewater; Physicochemical purification; Artiodactyla; Waste water purification
• ISSN: 1479-487X; 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2014.927533

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 6 w/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 CO ₂ gas bubbling. The colour removal rate approximately exceeded 50% with M-CSH-lime addition rates of>0.15 w/v%. The removal rate of exceeded 80% with the addition of>0.03 w/v% of M-CSH-lime. The removal rates of coliform bacteria and Escherichia coli exceeded 99.9% with>0.1 w/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 P ₂O ₅ in the recovered matter was>15% when the weight ratio of influent 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, and coliform bacteria at an addition rate of 0.03–0.15 w/v%, and that the recovered M-CSH-lime would be suitable as phosphorus fertilizer.