Dechlorination of Fly Ash by Hydrolysate of Municipal Solid Waste Leachate

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 May 6

PMID 35519747

Authors

Ming Gao

Menglu Wang

Chuanfu Wu

Xiaona Wang

Yufei Yang

Shu Liu

Takayuki Shimaoka

Qunhui Wang

Affiliations

Soon will be listed here.

Abstract

Municipal solid waste incineration fly ash (referred to as the fly ash) presents an important environmental problem in China today, but strategies for its treatment have yet to be widely studied and implemented. The currently available methods for the dechlorination of fly ash are not sufficient, given the amounts of fly ash produced each year. To increase the reuse fraction of fly ash as raw material for cement production, we propose an improved dechlorination method. Specifically, fly ash was leached with the hydrolysate of municipal solid waste leachate (HMSWL) to remove the water-insoluble chlorine. Three-step HMSWL leaching removed 94.3% of the total chlorine in fly ash, much more than the 82.7% that was removed through three-step ultrapure water (UW) leaching. X-ray diffraction indicated that three-step UW leaching could remove Cl mainly in the forms of KCl, NaCl, CaClOH and AlOCl, whereas three-step HMSWL leaching could further remove more water-insoluble Cl in the forms of AlOCl. In addition, the experimental results further suggested that the low pH of HMSWL (4.9) contributed little to the water-insoluble Cl removal, whereas the displacement of organic acid radicals (especially by the butyrate radical) was the major cause of water-insoluble Cl removal. Therefore, HMSWL rich in butyrate radical could be an ideal water substitute for fly ash dechlorination.

Citing Articles

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

Nguyen T, Tsai C, Horng J Molecules. 2022; 27(7).

PMID: 35408687 PMC: 9000401. DOI: 10.3390/molecules27072289.

References

Xu Y, Fu Y, Xia W, Zhang D, An D, Qian G . Municipal solid waste incineration (MSWI) fly ash washing pretreatment by biochemical effluent of landfill leachate: a potential substitute for water. Environ Technol. 2017; 39(15):1949-1954. DOI: 10.1080/09593330.2017.1345985. View

Zou D, Chi Y, Fu C, Dong J, Wang F, Ni M . Co-destruction of organic pollutants in municipal solid waste leachate and dioxins in fly ash under supercritical water using H2O2 as oxidant. J Hazard Mater. 2013; 248-249:177-84. DOI: 10.1016/j.jhazmat.2013.01.005. View

Yang S, Saffarzadeh A, Shimaoka T, Kawano T . Existence of Cl in municipal solid waste incineration bottom ash and dechlorination effect of thermal treatment. J Hazard Mater. 2014; 267:214-20. DOI: 10.1016/j.jhazmat.2013.12.045. View

Anastasiadou K, Christopoulos K, Mousios E, Gidarakos E . Solidification/stabilization of fly and bottom ash from medical waste incineration facility. J Hazard Mater. 2011; 207-208:165-70. DOI: 10.1016/j.jhazmat.2011.05.027. View

Ren Y, Yu M, Wu C, Wang Q, Gao M, Huang Q . A comprehensive review on food waste anaerobic digestion: Research updates and tendencies. Bioresour Technol. 2017; 247:1069-1076. DOI: 10.1016/j.biortech.2017.09.109. View

Chang H, Quan X, Zhong N, Zhang Z, Lu C, Li G . High-efficiency nutrients reclamation from landfill leachate by microalgae Chlorella vulgaris in membrane photobioreactor for bio-lipid production. Bioresour Technol. 2018; 266:374-381. DOI: 10.1016/j.biortech.2018.06.077. View

Mohan S, Gandhimathi R . Removal of heavy metal ions from municipal solid waste leachate using coal fly ash as an adsorbent. J Hazard Mater. 2009; 169(1-3):351-9. DOI: 10.1016/j.jhazmat.2009.03.104. View

Quina M, Bordado J, Quinta-Ferreira R . Treatment and use of air pollution control residues from MSW incineration: an overview. Waste Manag. 2007; 28(11):2097-121. DOI: 10.1016/j.wasman.2007.08.030. View

Horiuchi J, Shimizu T, Tada K, Kanno T, Kobayashi M . Selective production of organic acids in anaerobic acid reactor by pH control. Bioresour Technol. 2002; 82(3):209-13. DOI: 10.1016/s0960-8524(01)00195-x. View

10.

Iskander S, Novak J, He Z . Enhancing forward osmosis water recovery from landfill leachate by desalinating brine and recovering ammonia in a microbial desalination cell. Bioresour Technol. 2018; 255:76-82. DOI: 10.1016/j.biortech.2018.01.097. View

11.

Ren X, Xiao L, Qu R, Liu S, Ye D, Song H . Synthesis and characterization of a single phase zeolite A using coal fly ash. RSC Adv. 2022; 8(73):42200-42209. PMC: 9092078. DOI: 10.1039/c8ra09215j. View

12.

Yang R, Liao W, Wu P . Basic characteristics of leachate produced by various washing processes for MSWI ashes in Taiwan. J Environ Manage. 2012; 104:67-76. DOI: 10.1016/j.jenvman.2012.03.008. View

13.

Banks C, Lo H . Assessing the effects of municipal solid waste incinerator bottom ash on the decomposition of biodegradable waste using a completely mixed anaerobic reactor. Waste Manag Res. 2003; 21(3):225-34. DOI: 10.1177/0734242X0302100306. View

14.

Gao L, Goldfarb J . Heterogeneous biochars from agriculture residues and coal fly ash for the removal of heavy metals from coking wastewater. RSC Adv. 2022; 9(28):16018-16027. PMC: 9064278. DOI: 10.1039/c9ra02459j. View

15.

He P, Pu H, Shao L, Zhang H . Impact of co-landfill proportion of bottom ash and municipal solid waste composition on the leachate characteristics during the acidogenesis phase. Waste Manag. 2017; 69:232-241. DOI: 10.1016/j.wasman.2017.08.021. View

16.

Zhu F, Takaoka M, Oshita K, Morisawa S . The calcination process in a system for washing, calcinating, and converting treated municipal solid waste incinerator fly ash into raw material for the cement industry. J Air Waste Manag Assoc. 2011; 61(7):740-6. DOI: 10.3155/1047-3289.61.7.740. View

17.

Kaur K, Mor S, Ravindra K . Removal of chemical oxygen demand from landfill leachate using cow-dung ash as a low-cost adsorbent. J Colloid Interface Sci. 2016; 469:338-343. DOI: 10.1016/j.jcis.2016.02.025. View

18.

Ferreira C, Ribeiro A, Ottosen L . Possible applications for municipal solid waste fly ash. J Hazard Mater. 2002; 96(2-3):201-16. DOI: 10.1016/s0304-3894(02)00201-7. View

19.

Boghetich G, Liberti L, Notarnicola M, Palma M, Petruzzelli D . Chloride extraction for quality improvement of municipal solid waste incinerator ash for the concrete industry. Waste Manag Res. 2005; 23(1):57-61. DOI: 10.1177/0734242X05051017. View

20.

Wang L, Jin Y, Nie Y . Investigation of accelerated and natural carbonation of MSWI fly ash with a high content of Ca. J Hazard Mater. 2009; 174(1-3):334-43. DOI: 10.1016/j.jhazmat.2009.09.055. View