Performance of sediment phosphorus reduction via electrokinetic drainage of pore water

HAN Ding; LI Rui; TANG Xian-qiang; XIAO Shang-bin

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China Environmental Science ›› 2020, Vol. 40 ›› Issue (7) : 3114-3123.

Environmental Ecology

Performance of sediment phosphorus reduction via electrokinetic drainage of pore water

HAN Ding^1,2,3, LI Rui^2,3, TANG Xian-qiang^2,3, XIAO Shang-bin¹

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Abstract

In this study, heavily polluted sediment and electrokinetic treatment apparatus functioned with pore water drainage were used to conduct experiments, which aimed to assess the impacts of pore water drainage on sediment phosphorus reduction, and analyze the migration and transformation of sediment phosphorus fractions due to electrokinetic drainage of pore water. The experimental results showed that the total effluent volume drained from cathode was 5740mL, which was greatly higher than 2121mL drained from the anode. However, effluent total phosphorus concentration of anode was higher than that of cathode, and more than 80% of the phosphorus was discharged from the anode effluent. Electromigration played a major role in the phosphorus separation, and applying of voltage gradient caused more than 70% increase in phosphors discharge when compared to none powered control. Moreover, the maximum amount of phosphorus discharge achieved when the treatment lasted 18days under a voltage gradient of 0.25V/cm. During powered 48h, the efficiency of phosphorus discharge dropped sharply after reached its peak of 0.73mg/(kW·h). In contrast to original sediment samples, pore water drainage caused 14.07% and 231.92mg/kg reduction in sediment moisture content and total phosphorus storage. Moreover, the average decrease in sediment phosphorus fractions of Ex-P, Fe-P, Fe-P, Oc-P and Ca-P were 80.01%, 14.75%, 40.65% and 19.22%, respectively. Anode acidification promoted the dissolution of iron oxide and the liberation of Ca-P, and led to greater decrease of Oc-P and Ca-P near the anode zone. For cathode, alkalinization caused the release of Fe-P, and much more reduction of Fe-P occurred near the cathode zone. Finally, calculated average reduction in sediment bioavailable phosphorus (Ex-P+Fe/Al-P) content was 14.12% when electrokinetic drainage pore water applied, and the risk of sediment phosphorus release thus could be potentially restrained.

Key words

electrokinetic dewatering / electrokinetic remediation / phosphorus fractions / polluted sediment

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HAN Ding, LI Rui, TANG Xian-qiang, XIAO Shang-bin. Performance of sediment phosphorus reduction via electrokinetic drainage of pore water[J]. China Environmental Science. 2020, 40(7): 3114-3123

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