Variation in organic matter characteristics of landfill leachates in different stabilisation stages

Abstract

This study investigates the effect of landfill age on landfill leachate characteristics; two aspects are focused here. One is ultraviolet absorbance at 254 nm (UV(254)) property, as the discharge of landfill leachates to publically owned treatment works can cause interference with UV(254) disinfection. The other is biorefractory organic nitrogen in leachates, as it can contribute to effluent nitrogen making it difficult to meet stringent effluent nitrogen regulations. To study variation in UV(254)-absorbing organic carbon and organic nitrogen, leachate samples ranging from cells with ages 2 to 30 y from a large landfill in Kentucky, were collected and fractionated on a basis of their molecular weight and chemical nature into humic acids, fulvic acids and a hydrophilic fraction. The effectiveness of long term landfilling and membrane treatment for organic matter and organic nitrogen removal was examined. Humic materials, which were the major UV(254)-absorbing substances, were mainly >1 kDa and they degraded significantly with landfill age. The hydrophilic organic fraction, which was the major contributor to organic nitrogen, was mainly <1 kDa and it became increasingly recalcitrant with landfill age. This study provides insight into the characteristics of the different leachate fractions with landfilling age that might aid the design of on-site leachate treatment techniques.

Evaluation of the Effects of Chemically Enhanced Primary Treatment on Landfill Leachate and Sewage Co-treatment in Publicly Owned Treatment Works

“…The colloidal organic matter refers to the humic-like 26/39 substances which are more settleable and can be destabilized much easily than short chain organic acids. Studies have shown that normal leachate and concentrated leachate have different proportions of humic-like substances, and humic-like substance fraction is higher in normal leachate than concentrated leachate (Gawande, 2018;Gupta et al, 2014b;Iskander et al, 2018;Zhao et al, 2013a). In this study, it is shown that organic matter in normal leachate is humic-like substances dominated, while concentrated leachate short chain organic acids dominated.…”

Efficient inactivation of African swine fever virus by a highly complexed iodine combined with compound organic acids

“…ASFV can be transmitted by direct or indirect contact between infected animals, infected pig products, or infected fomites, such as transport vehicles (26,27). Organic materials such as soil and manure can interfere with disinfectants (HPCI and COAs) (28). Based on the above results, we recommend that the ground and equipment of pig farms were thoroughly washed and then disinfected.…”

Impact of Uniaxial Mechanical Perturbation on Structural Properties and Smectite Porosity Features: Ion Exchanger Efficiency and Adsorption Performance Fate

“…e clay mineral membranes are exposed to various chemical, biological, and physical stresses, and they are influenced by the subsequent leachate [16][17][18][19][20][21]. To evaluate the consistency of these membranes, it is important to examine their chemical compatibility with the different fluids or the leachate to which they are subjected [22].…”