Assessing effects of aerobic and anaerobic conditions on phosphorus sorption and retention capacity of water treatment residuals

• Published in: Journal of environmental management Vol. 92; no. 3; pp. 960 - 966
• Main Authors: Oliver, Ian W., Grant, Cameron D., Murray, Robert S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2011; Elsevier; Academic Press Ltd
• Subjects: Aerobiosis; Anaerobic conditions; Anaerobic treatment; Anaerobiosis; Animal, plant and microbial ecology; Anoxic conditions; Applied ecology; Applied sciences; Aqueous solutions; Biological and medical sciences; Byproducts; Conservation, protection and management of environment and wildlife; Drinking water; Environmental protection; Eutrophication; Exact sciences and technology; Forestry; Fundamental and applied biological sciences. Psychology; General aspects; Phosphorus; Phosphorus - chemistry; Phosphorus control; Pollution; Redox potential; Sorption; Water - chemistry; Water treatment; Water treatment and pollution; Eh; Anoxic conditions; Redox potential; Phosphorus control; Eutrophication; Water treatment; Anoxia; Phosphorus; Aerobe; Retention; Environmental management; Sorption; Anaerobe
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2010.11.016

Water treatment residuals (WTRs) are the by-products of drinking water clarification processes, whereby chemical flocculants such as alum or ferric chloride are added to raw water to remove suspended clay particles, organic matter and other materials and impurities. Previous studies have identified a strong phosphorus (P) fixing capacity of WTRs which has led to experimentation with their use as P-sorbing materials for controlling P discharges from agricultural and forestry land. However, the P-fixing capacity of WTRs and its capacity to retain sorbed P under anaerobic conditions have yet to be fully demonstrated, which is an issue that must be addressed for WTR field applications. This study therefore examined the capacity of WTRs to retain sorbed P and sorb further additional P from aqueous solution under both aerobic and anaerobic conditions. An innovative, low cost apparatus was constructed and successfully used to rapidly establish anoxic conditions in anaerobic treatments. The results showed that even in treatments with initial solution P concentrations set at 100 mg l−1, soluble reactive P concentrations rapidly fell to negligible levels (due to sorption by WTRs), while total P (i.e. dissolved + particulate and colloidal P) was less than 3 mg l−1. This equated to an added P retention rate of >98% regardless of anaerobic or aerobic status, indicating that WTRs are able to sorb and retain P in both aerobic and anaerobic conditions. System for establishing anaerobic and aerobic conditions. [Display omitted]