Landfill leachate treatment using hydrodynamic cavitation: exploratory evaluation

被引:23
|
作者
Gutierrez-Mosquera, Luis F. [1 ]
Arias-Giraldo, Sebastian [2 ]
Zuluaga-Meza, Alejandro [3 ]
机构
[1] Univ Caldas, Dept Engn, Food & Agribusiness Res Grp, Bioproc & Agroind Plant, Manizales, Colombia
[2] Univ Catolica Luis Amigo, Fac Adm Econ & Accounting Sci, Goras Res Grp, Medellin, Colombia
[3] Univ Nacl Colombia, Manizales, Colombia
关键词
Bio-refractory compound; Hydrodynamic cavitation; Landfill; Leachate; Organic matter; Water quality; ADVANCED OXIDATION PROCESSES; WASTE-WATER TREATMENT; BIODEGRADABILITY; INTENSIFICATION; DEGRADATION; PERSULFATE; IMPROVE;
D O I
10.1016/j.heliyon.2022.e09019
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Hydrodynamic cavitation is a new technology used for the treatment of wastewater. Landfill leachates contain a large variety of organic pollutants and inorganic matter, with recalcitrant and bio-refractory compounds. The present study was designed to evaluate the effect of hydrodynamic cavitation on landfill leachate quality indices. Three experimental designs were proposed. First, the influence of collection climate on leachate quality characteristics was analyzed. Second, the best cavitation time was chosen, which promoted the greatest reduction in the effluent pollutant load. Finally, the hydrogen peroxide (H2O2) concentration was evaluated as an adjuvant in the cavitation process. A model TEKMASH TEK-1SL equipment was used. This cavitation unit operated with a flow rate of 30 m3 h-1, a temperature of 75 degrees C, and an inlet pressure of 3 bar. The cavitation chamber was of the annular flow type. The statistical analyses were run through ANOVA and Tukey's test, with significance alpha = 0.05. The response variables for the factors were biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total organic carbon (TOC) and total suspended solids (TSS). An influence of the climatic condition on the leachate quality parameters was found, and the difference was marked in COD. In all cases, both for the cavitation process and for the cavitation-oxidant scheme, there was a reduction of 23%-51% BOD5, 30%-53% COD, 12%- 21% TOC and 100% removal in TSS. In a 30-minute treatment, the highest COD removal percentage was reached, corresponding to 53.20%. Furthermore, a 200 ppm concentration of hydrogen peroxide enhanced the reduction of BOD5 and COD with proportions of 51.55% and 38.21%, respectively. Hydrodynamic cavitation offers advantages in the treatment of wastewater and can be used as an independent technique or as a hybrid method.
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页数:7
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