Column Test in Field Application Study Using Biostimulant Ball in Contaminated Coastal Sediment
2016
Woo, Jung Hui | Subha, Bakthavachallam | Song, Young Chae
This study consisted of a field column test to evaluate the effectiveness of the slow release and long-term outcomes of a biostimulant ball (BSB) in contaminated coastal sediment. The BSB was prepared using biostimulating agents consisting of sulphate, nitrate and acetate with uncontaminated dredged sediment, and cellulose acetate (CA) and polysulfone (PS). SEM images were captured to investigate the physical properties of the PS and CA-coated biostimulant ball, and doing so was observed to have a great influence in the release rate of the nutrients. The CA-coated BSB had large pores with an irregular shape inside and a honeycomb structure outside. The PS-coated BSB had no pores inside and had small pores outside the coating, and the release rate of the PS-coated BSB was slower with more long-term effects than the CA-coated BSB. The CA- and PS-coated BSB sample showed that the chemical oxygen demand (COD), total phosphorous (TP) and total nitrogen (TN) had been effectively reduced, and conversely, pH is not significantly affected when using the BSB. Moreover, the fractions of heavy metals (Cd, Zn, Cu, Pb, Cr and Fe) were highly influenced when using the PS-coated BSB added sample than when using the CA-coated BSB. Therefore, application of CA- and PS-coated BSB is a promising method for cleaning contaminated coastal sediment.
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