Evaluation of phosphoric acid as the chemical stabilizing agent of heavy metals in medical waste fly ash

Sukandar, . and Masaru Tanaka, . and Isao Aoyama, . (2008) Evaluation of phosphoric acid as the chemical stabilizing agent of heavy metals in medical waste fly ash. [Proceedings Paper]

Acidic and alkaline phosphoric acid solutions were used to stabilized heavy metals in medical waste fly ash. The Japanese leaching test JLT-13 was applied to the stabilized fly ash products in order to evaluate the leachability of heavy metals. An ecotoxicity assessment using a battery of bioassay based on lettuce root elongation inhibition and daphnia magna mortality test was conducted to the stabilized fly ash products in comparison with the untreated fly ash. The results showed that both acidic and alkaline phosphoric acid solutions were able to decrease significantly ANOVA P 0.05 the concentration of heavy metals in the leachate. Although the leachate from both stabilized and untreated fly ash were very toxic to lettuce and daphnids the addition of both of stabilization agents diminished significantly ANOVA P0.05 the toxicity of the leachate to the two test organisms.

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Abstract

Acidic and alkaline phosphoric acid solutions were used to stabilized heavy metals in medical waste fly ash. The Japanese leaching test JLT-13 was applied to the stabilized fly ash products in order to evaluate the leachability of heavy metals. An ecotoxicity assessment using a battery of bioassay based on lettuce root elongation inhibition and daphnia magna mortality test was conducted to the stabilized fly ash products in comparison with the untreated fly ash. The results showed that both acidic and alkaline phosphoric acid solutions were able to decrease significantly ANOVA P 0.05 the concentration of heavy metals in the leachate. Although the leachate from both stabilized and untreated fly ash were very toxic to lettuce and daphnids the addition of both of stabilization agents diminished significantly ANOVA P0.05 the toxicity of the leachate to the two test organisms.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. GE90 M3I61 2008 Call Number
AGROVOC Term:	Heavy metals
AGROVOC Term:	Wastes
AGROVOC Term:	Fly ash
AGROVOC Term:	Leachates
AGROVOC Term:	Toxicity
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/11798

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