Removal of phosphorus from water using calcium-rich organic waste and its potential as a fertilizer for rice growth. Issue 2 (April 2022)

• Record Type: Journal Article
• Authors: Lee, Jae-In; Oh, Jung-Seok; Yoo, Soo-Cheul; Jho, Eun Hea; Lee, Chang-Gu; Park, Seong-Jik
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 2(2022)
• Publication Date: 2022-04
• Subjects: Mussel shell -- Calcination -- Phosphorus -- Toxicity -- Fertilizer -- Rice growth; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107367
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Mussel shell (MS) waste was upcycled as value-added products, namely an adsorbent for P removal from lakes and P fertilizer after adsorbent use. Calcination improved the P adsorption capacity of MSs by changing the mineral structure from calcite (CaCO3 ) to lime (CaO) and portlandite (Ca(OH)2 ) and enhancing the elution amount of Ca 2+ . The MSs were calcined at the optimum calcination temperature of 800 °C (CMS-800) and then used to adsorb P in aqueous solution to form hydroxyapatite (Ca5 (PO4 )3 (OH)). The pseudo-first-order and Langmuir models were well fitted to kinetic and equilibrium P adsorption by CMS-800. The maximum adsorption capacity of CMS-800 obtained from the Langmuir model was 66.70 mg/g. The adsorption amount of 88.40 mg/g at a pH of 3 decreased to 58.48 mg/g at a pH of 7, but increased again to 91.16 mg/g at a pH of 11. Anions coexisting in the P solution reduced the amount of P adsorbed by CMS-800; their effects were in the order of SO4 2- > HCO3 - > > Cl - > NO3 - . Two centimeters of CMS - 800 in a fixed-bed column showed a P removal rate of 50.92% (4.29 mg/g) until saturation. The initial and final earthworm weights after the addition of CMS-800 and P-adsorbed CMS-800 (P-CMS-800) did not show a statistically significant difference. P-CMS-800 was present mainly in the form of Ca-bound P and residual P, which accounted for 43.07% and 55.64% of the total, respectively. The medium level of P-CMS-800 (0.73 g/kg soil) promoted plant growth by increasing major agronomic traits. CMS-800 can be used as an effective adsorbent to remove P from water, and P-CMS-800 can be used as a substitute for P fertilizer in rice cultivation. Graphical Abstract: ga1 Highlights: Mussel shells were calcined to improve their adsorption capacity for P removal. The maximum P adsorption capacity of CMS-800 was 81.92 mg/g. CMS-800 and P-CMS-800 were not toxic to earthworms. The medium level of P-CMS-800 promoted rice plant growth.