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Municipal River Sediment Remediation with Calcium Nitrate, Polyaluminium Chloride and Calcium Peroxide Compound

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Abstract:

In situ laboratory studies were carried out in simulated reactors to evaluate the potential of calcium nitrate, Polyaluminium Chloride (PAC) and calcium peroxide for remediation municipal river sediment. Calcium peroxide could increase the dissolved oxygen concentration (DO) of water for long time (8 weeks). It would optimize the anoxia environment of sediment and be propitious for remediation of sediment. The disadvantage of calcium peroxide was that pH (8.6) would rise slightly and accelerate NH3-N release. Spraying poly-aluminum chloride also could prohibit phosphorus release from sediment. But the remediation effect might be weakened due to disorganization of the aluminium floc after period of time. Phosphorus release from sediment injected calcium nitrate was almost stopped during the experiment. Calcium nitrate could greatly improve the ability of bio-treatment properties for sediment. After 28 weeks of treatment, the TN concentration with dose of 70g per square meter NO3-N could reduce to common level compared to blank reactor by denitrification. It makes in-situ chemical remediation technology by calcium nitrate injection become possibly.

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Info:

Periodical:

Advanced Materials Research (Volumes 396-398)

Pages:

1899-1904

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.396-398.1899

Citation:

Cite this paper

Online since:

November 2011

Authors:

Jian Jun Huang, Yu Hong Li, Jing Mei Sun, Nan Li

Keywords:

Phosphorus, Remediation, Sediment

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