Nitrification in lake sediment with addition of drinking water treatment residuals

Applicability of drinking water treatment residue for lake restoration in relation to metal/metalloid risk assessment

“…Wang et al . reported that DWTR addition could improve the sediment habitats for them to become more appropriate for bacteria survival202425. Ippolito et al .…”

“…Aging also exerts a limited effect on the P immobilization capability of DWTR in lake water because of the inhibition of Al and Fe crystallization caused by ligands, e.g., organic matter, phosphate, and silicate contained in DWTR23. Moreover, DWTR addition could induce conditions that are beneficial to anaerobic ammonium oxidation and nitrification in lake sediments2425. Successful DWTR application can lead to another win-win situation for environmental remediation.…”

Aging of aluminum/iron-based drinking water treatment residuals in lake water and their association with phosphorus immobilization capability

“…The sediment pH and electrical conductivity were 7.25 and 1482 us cm À1 , and also contained 63.2 mg g À1 organic matter, 56.3 mg g À1 Al, and 34.2 mg g À1 Fe, respectively. Other basic characteristics of the sediments can be found elsewhere (Wang et al, 2014b). Lake water was sampled at the same location at a depth of approximately 0.5 m. The lake water was filtered through a 0.45 mm Millipore filter paper and stored at 4 C.…”

“…The residual metal content in DWTRs (non-extractable by BCR procedure) was calculated as the difference between the sum of each fraction and the total content quantified using USEPA Method 3051 (USEPA, 2007). The detailed metals extraction and determination procedures can be seen in reference by Wang et al (2014b). All analyses mentioned above were run in triplicate.…”

Comparison of metals extractability from Al/Fe-based drinking water treatment residuals

“…Studies have demonstrated effective P sorption by WTRs and the high stability of WTRs-sorbed P under a variety of environmental conditions (Makris et al 2004;Agyin-Birikorang and O'Connor 2007;Oliver et al 2011;Wang et al 2012a). Due to the high P adsorption capacity of WTRs, the productive reuse of WTRs to control P pollution in water, soils, and sediments has been examined, including WTR use as a soil amendment to reduce P loss from soils (Agyin-Birikorang et al 2009;Silvetti et al 2014), use as media within a constructed wetland to remove excessive P from wastewater (Hu et al 2014), and use as a stabilizer to control P release from sediments (Wang and Pei 2013;Wang et al 2014). There is also potential for WTRs use as a sorbent for metals and metalloids.…”