Lanthanum-modified bentonite: potential for efficient removal of phosphates from fishpond effluents

Abstract

Adsorption has been suggested as an effective method for removing phosphates from agricultural wastewater effluents that contain relatively high phosphate concentrations. The present study focused on the use of a bentonite-lanthanum clay (Phoslock) for reducing the dissolved phosphate concentration in fishpond effluents. Batch experiments with synthetic phosphate-spiked solutions and with fishpond effluents were performed in order to determine adsorption equilibrium isotherms and kinetics as well as to determine the efficiency of Phoslock in removing phosphate from these solutions. In the synthetic phosphate-spiked solution, the mean maximum phosphate adsorption capacity was 92 mg Phoslock/mg phosphate removal. A ratio of 50, 100, and 200 mg Phoslock/mg phosphate removal was found for complete phosphate removal from the fishpond effluents, where higher doses of Phoslock led to a faster removal rate (94% removal within the first 150 min). These results show that bentonite-lanthanum clay can be employed for designing a treatment process for efficient phosphate removal from fishpond effluents.

Effects of multiple environmental factors on the elimination of methomyl in aquaculture water

“…This would increase relative availability and increase the degradation rate of methomyl under higher pH values. In an aquaculture system, the pH of water is re duced by the CO 2 emitted by aquatic animals such as fish and the acid produced by nitrifica- tion reactions, and a low pH will have a very adverse effect on fish growth (Sipaúbatavares et al 2016, Kurzbaum et al 2017. Therefore, pH plays an important role in maintaining the stable operation of fishpond systems.…”

Phosphate removal and recovery by lanthanum-based adsorbents: A review for current advances

“…Phoslock ® and Al/Ben increased sediment stability by 265% and 101%, respectively, while Al did not stabilize the sediments Dithmer et al (2016). used LMB to conduct a joint field and laboratory-scale study on 10 European lakes from 2006 to 2013, which showed that the P release in sediments was effectively controlled within 2 to 9 years after treatment Kurzbaum et al (2017). used Phoslock ® to treat phosphate wastewater in fish ponds and achieved a removal rate of 94% within 150 min.…”