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

Abstract

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.

Use of drinking water treatment residuals to control the internal phosphorus loading from lake sediments: Laboratory scale investigation

“…13,14 The adsorbed P in WTRs were stable under different conditions. [15][16][17] Therefore, researchers are trying to apply WTRs to control P pollution in environment. Most of them focused on reusing it as a soil amendment for off-sites P pollution control, or recently, as substrate in constructed wetlands to remove excessive P in wastewater.…”

Improvement of residuals treatment efficiency from water treatment plant by auto supernatant drain system

“…Then the supernatant in the thickener is again collected and discharged into streams, and the sediment sludge is moved to the dehydration building for treatment. The moisture content of the dehydrated cake greatly depends on the operation results of the effluent treatment process and the results of the thickener operation, which are previous processes (Oliver et al, 2011). To examine how the moisture content of the dehydrated cake is influenced by the ASDS installed in the residuals treatment facility, Fig.…”

Locally Sourced Iron and Aluminum Byproducts Decrease Phosphorus Leached from Broiler House Dust Deposited near Ventilation Fans

“…Substantial research has been conducted evaluating material that can sorb large amounts of P and structures to contain such materials [16] [17]. To be cost-effective, the P-retention material needs to be locally sourced, readily available, and inexpensive.…”