Quantification of aluminum content in the compost made with sludge wasted from a bean curd factory
2007
Noguchi, R.(Niigata Univ. (Japan)) | Mohamad, M.S. | Miura, M. | Ono, H. | Kohya, H. | Takahashi, H. | Haginoya, K. | Hayakawa, T. | Hori, H.
Wasted sludge from a bean curd factory was mixed with newspaper chips cut (12 mm x 3 mm) and aerated right after the placement of the mixture into a fermenter. The sludge was mixed with newspaper chips at 15% (w/w) and composted under continuous aeration at 80 L/min/square m bottom area of the fermenter. Hereafter we called the compost as paper-compost. The resulted paper-compost showed no inhibitory effect in germination of the komatsuna, Brassica nappas seeds and increased thereafter growth of them. On the other hand, the application of chemical fertilizer at the same amount of nitrogen content as that of paper-compost showed almost no growth of the plantlets. Generally, polyaluminum chlorides were added to the wasted water in active sludge sewer system to coagulate the excess amount of sludge, therefore, there is a possibility that the Al to remain after even the completion of composting, then the aluminum contents in the compost was evaluated with an atomic absorption spectrophotometer. The content in the compost was 160 mg/kg compost dried. On the other hand, the aluminum contents in wasted sludge and newspaper which were used to make the compost were 110 and 150 mg/kg, respectively. Thus, the aluminum in the composts was thought to be derived from those newspapers and active sludge. At least, polyaluminum chloride used to coagulate the excess sludge was not seemed to remain in the compost.
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