Affiliation:
1. School of Resources and Environmental Engineering Hefei University of Technology Hefei China
2. School of Earth and Space Sciences University of Science and Technology of China Hefei China
Abstract
AbstractExcessive ammonium and phosphate in aquatic settings may produce major eutrophication. Adsorbents can be used to reduce the eutrophication of natural water bodies. In this study, a sustainable and efficient ceramic adsorbent (sludge/biomass ash ceramsite [SBC]) was prepared by using sludge and biomass ash with a weight ratio of 1:1; the sintering parameters were 1070°C for 15 min. The NH4+‐N and P adsorption capabilities were improved by utilizing 1 mol L−1 NaOH and 1.6 mol L−1 La(NO3)3·6H2O for modification. When the pH and duration were 7 and 1440 min, respectively, the maximum bending capacity of ammonia nitrogen and phosphorus was 3.2 and 2.1 mg g−1 at 308 K. The pseudo‐second‐order kinetic model better describes the adsorption dynamics of NH4+‐N and P, whereas the Langmuir model better describes the adsorption isotherm models of NH4+‐N and P. The adsorption mechanism of SBC‐NaOH on NH4+‐N is ion exchange between Na+ and NH4+, whereas the adsorption mechanism of SBC‐La on phosphorus is ion exchange and La3+ adsorption. SBC combines efficient wastewater purification with the reuse of solid waste. The findings gave rise to the possibility of recycling ceramics as a plant fertilizer with a delayed release in the future.Practitioner Points
New ceramsite was made from sludge and biomass ash.
NH4+‐N (3.2 mg g−1) and P (2.1 mg g−1) were effectively adsorbed by ceramsite.
The mechanism of NH4+‐N and P adsorption by ceramsite was studied.
Absorbed ceramsite can be used as slow‐release fertilizer in plant cultivation.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Anhui Provincial Key Research and Development Plan
Natural Science Foundation of Anhui Province
Subject
Water Science and Technology,Ecological Modeling,Waste Management and Disposal,Pollution,Environmental Chemistry