Surfactant-Enhanced Remediation of Soil and Ground Water Contaminated with Pentachlorophenol by Using Aquatic Plant: Potential and Assessment

• Main Authors: Ming-Yu Li, 李明諭
• Other Authors: Kuo-Hsiung Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/ts2cgz

碩士 === 輔英科技大學 === 環境工程與科學系碩士班 === 101 === In this study, phytoremediation was used to evaluate the treatment effect of pentachlorophenol (PCP)-contaminated soil and ground water. The performance upon distinct conditions was examined with using the aquatic plant, Salvinia natans. The object was to collect and estimate the useful data and parameters, those of which could be utilized for the nature system or pollution site. The 11-day IC50 (the concentration resulting in 50 % inhibition) were 1.12, 3.06 and 5.25 mg L-1, respectively corresponding to 195, 100 and 45 μmol m-2.s-1 of radiation strength. Results indicated that the toxicity of PCP on Salvinia natans was increased with increment of photosynthetically active radiation (PAR). The toxicity kinetics can be described by a one-compartment kinetics model. The kinetically parameters was estimated statistically with the method of nonlinear regression. Results indicated that all of the accumulation and elimination data was fitted well with having the coefficients of determination, r2 > 0.90. The best bioconcentration factors (BCFs) was about 82 L kg-1 when the higher PAR and lower PCP concentration were used. Removal of PCP after a 7-day period can reach to 90 % under plant-water system for the use of higher PAR. The conjugated PCP in plant was great in a range of 56-80 % of total PCP if the lower PAR was used. It revealed that PCP metabolism in Salvinia natans could be more effective under the situation of lower PAR. Furthermore, the toxicity was increased and the BCF value was elevated when the surfactant (TS) was added into the plant-water system. With the use of PAR 100 μmol m-2.s-1, the removal of PCP was elevated from 36-70 % to 42-84 % after 11-day duration time. For the integrated remediation system with combining plant, water and soil, the removal of PCP from soil can reach to 61 and 73 % corresponding to none-TS and TS-added treatment. The PCP concentrations in soil will be decreased to lower than the regulatory standard (200 mg kg-1) for the both treatments, while the duration time used in none-TS test (26 days) will longer than that of TS-added treatment (19 days). In the result, the aquatic plant, Salvinia natans may be applicable for the integrated remediation of PCP-contaminated soil and ground water, if the optimal conditions such for PAR strength and surfactant utility were provided.