Dechlorination of fly ash by hydrolysate of municipal solid waste leachate

Abstract

Hydrolysate of municipal solid waste leachate rich in butyrate radical could be an ideal water substitute for municipal solid waste incineration fly ash (referred as to fly ash) dechlorination.

Sustainable Recovery of Valuable Nanoporous Materials from High-Chlorine MSWI Fly Ash by Ultrasound with Organic Acids

“…Fly ash has a high concentration of metal oxides, which react with H + to produce metal ions and water molecules. In addition, organic acid anions dissolve chloride salts or induce Cl − displacement in fly ash [ 37 ]. Moreover, from the ANOVA analysis, the acid content contribution was around 2–3%.…”

“…Moreover, the S/L ratio of 1:10 was applied for Cl leaching from fly ash by ultrapure water, MSW leachate, and hydrolysate of the MSW leachate with one-step and three-step leaching approaches [ 37 ]. In the one-step leaching experiment, 15 g of fly ash was added to 150 mL of solution and agitated for 3 h. In the three-step procedure, 15 g of fly ash and 50 mL of solution were shaken for 1 h and then repeated three times with 50 mL of fresh solution each time.…”

“…Briefly, a total leaching time of 10 min was required for this UAW procedure. However, it took 2 h for shaking with organic acids [ 38 ], 3 h for leaching with hydrolysate of the municipal solid waste leachate [ 37 ], and 3 h for leaching with lactic acid fermentation broth [ 14 ]. The as-developed leaching method also revealed a superior capability in Cl removal compared with the high-cost method of thermal treatment [ 17 ], which consumed 1 h for roasting at 1050 °C to eliminate Cl from 8.6 to 1.47%.…”