Effect of Heavy Application of Incinerated Sewage Sludges to Soil on Crop Growth and Heavy Metal Uptake

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  • 下水汚泥焼却灰の多量施用が作物の生育と重金属吸収に及ぼす影響
  • ゲスイ オデイ ショウキャクバイ ノ タリョウシヨウ ガ サクモツ ノ セイイク ト ジュウキンゾク キュウシュウ ニ オヨボス エイキョウ

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Abstract

Effect of heavy application of incinerated sewage sludge on the growth of two species of crop plants was studied in a greenhouse. Ashes prepared from two kinds of sewage sludges conditioned with different dewatering methods (chemical precipitation by lime and ferric chloride, and heat precipitation) were used in the experiment. Ashes were prepared from those sludges by 800℃ incineration treatment. Five application rates of ashes containing 0.5, 1.0, 2.0, 4.0, and 8.0 g P_2O_5/1.5 kg dry soil were as follows. 1) The growth of oats was decreased by application of ash that was prepared from chemical precipitation sludge. It was considered that high chloride ion concentration of soil solution caused by lime and feerric chloride treatment induced the inferior growth of oats. 2) The growth and phosphorus content of oats were increased by application of ash that was prepared from heat precipitation sludge. The utilization percentage of phosphorus in the ash was about 50% compared to superphosphate. 3) When incinerated chemical precipitation sludge was supplied, Zn and Cu concentration of oat tops were increased slightly and Zn and Cr concentration of oat roots were increased. When incinerated heat precipitation sludge was supplied, Zn and Cu concentration of oat tops were increased slightly and Zn concentration of oat roots was increased slightly. Application of both ashes did not effect on concentration of Fe, Mn, Pb, and Cd. 4) The growth of rape was improved by application of the two kinds of ashes, and the rate of the improvement was not different between the ashes. Accumulation of heavy metals such as Mn, Zn, Cu, Cr, Pb, and Cd was not increased in edible parts of rape.

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