Open AccessEffective photochemical treatment of a municipal solid waste landfill leachate
Author(s) -
Ardak Makhatova,
Birzhan Mazhit,
Yerbol Sarbassov,
Kulyash Meiramkulova,
Vassilis J. Inglezakis,
Stavros G. Poulopoulos
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0239433
Subject(s) - leachate , ferrous , chemistry , hydrogen peroxide , total organic carbon , carbon fibers , ferric , environmental chemistry , dissolved organic carbon , total inorganic carbon , nitrogen , nuclear chemistry , inorganic chemistry , carbon dioxide , materials science , organic chemistry , composite number , composite material
This work aimed at studying the photochemical treatment of a landfill leachate using ultraviolet light, hydrogen peroxide, and ferrous or ferric ions, in a batch recycle photoreactor. The effect of inorganic carbon presence, pH, initial H 2 O 2 amount (0–9990 mg L -1 ) as well as Fe(II) (200–600 ppm) and Fe(III) (300–700 ppm) concentrations on the total carbon removal and color change was studied. Prior to the photochemical treatment, a pretreatment process was applied; inorganic nitrogen and inorganic carbon were removed by means of air stripping and initial pH regulation, respectively. The leachate sent subsequently for photochemical treatment was free of inorganic carbon and contained only organic carbon with concentration 1200±100 mg L -1 at pH 5.1–5.3. The most favorable concentrations of H 2 O 2 and ferric ions for carbon removal were 6660 mg L -1 and 400 ppm, respectively. Adjusting the initial pH value in the range of 2.2–5.3 had a significant effect on the organic carbon removal. The photo-Fenton-like process was more advantageous than the photo-Fenton one for leachate treatment. By applying the most favorable operating conditions, 88.7% removal of total organic carbon, 100% removal of total inorganic carbon, 96.5% removal of total nitrogen, and 98.2% color removal were achieved.