Pilot-scale comparison of two hybrid-passive landfill leachate treatment systems operated in a cold climate

Cold ambient temperatures can negatively affect the performance of passive and semi-passive landfill leachate treatment systems and decrease treatment efficiency. Cold temperature leachate treatment efficiencies were compared between a commercially available semi-passive treatment system and a passive peat and wood shaving biological trickling filter. The addition of an active fixed-film pretreatment stage in the treatment train was also assessed. Results indicated that the internal temperature of the peat filters was independent of influent water temperature; exothermic reactions maintained internal system temperatures. It was determined that pretreatment of the leachate did not affect the overall removal of chemical oxygen demand (COD), but did increase nitrification in the subsequent passive treatment systems and allowed for the removal of dissolved inorganic constituents prior to the passive treatment system, which will extend the useful life of the entire treatment train. The hybrid-passive treatment systems reduced COD concentrations by 10 ± 3% and 15 ± 3%, in the semi-passive treatment system and the peat and wood shaving biological trickling filter-based systems, respectively, and indicated that nitrifying biomass was starting to populate the treatment systems. It was therefore concluded that operation of these systems would be feasible under cold climate and should be assessed at the pilot-scale.

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Electrochemical removal of Bisphenol A from landfill leachate under Nordic climate conditions

Journal of Applied Electrochemistry ◽

10.1007/s10800-020-01476-3 ◽

2020 ◽

Vol 50 (11) ◽

pp. 1175-1188

Author(s):

Noëmi Ambauen ◽

Clara Weber ◽

Jens Muff ◽

Cynthia Hallé ◽

Thomas Meyn

Keyword(s):

Bisphenol A ◽

Electrochemical Oxidation ◽

Landfill Leachate ◽

Anode Materials ◽

Matrix Effects ◽

Cold Climate ◽

Leachate Treatment ◽

Cold Temperatures ◽

Degradation Rates ◽

By Products

Abstract This study investigated the applicability of electrochemical oxidation for landfill leachate treatment in climate areas, where cold temperatures prevail (like Northern Norway). Experiments were completed with pre-treated (coagulation/flocculation and separation) landfill leachate at 6 and 20 °C in order to assess the temperature influence on the degradation of the organic pollutant Bisphenol A and the fate of the ordinary wastewater parameters COD and nitrate. Furthermore, two different anode materials (Ti/Pt and Nb/BDD) and three different current densities (10, 43 and 86 mA cm−2) were compared. Additionally, the formation of the two groups of disinfection by-products, trihalomethanes and perchlorate, was monitored. A 99% removal of Bisphenol A was confirmed at 6 °C on both tested anode materials, but a current density of at least 43 mA cm−2 must be applied. Removal rates were on average 38% slower at 6 °C than at 20 °C. For comparison, Bisphenol A removal in clean electrolyte disclosed faster degradation rates (between 50 and 68%) due to absent landfill leachate matrix effects. The energy consumption for 99% Bisphenol A removal was 0.28 to 1.30 kWh m−3, and was on average 14% higher at 6 °C compared to 20 °C. Trihalomethanes were mainly formed on Pt anodes in the ppb range, while perchlorate was primarily formed at BDD anodes in the ppm range. Formation of disinfection by-products increased with increased applied current and temperature. Electrochemical oxidation was found to be a suitable treatment process for landfill leachate in cold climate areas by successfully meeting treatment goals. Graphic abstract

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Process combination of nanofiltration and adsorption: optimisation of an air and back flushing procedure

Water Science & Technology Water Supply ◽

10.2166/ws.2003.0190 ◽

2003 ◽

Vol 3 (5-6) ◽

pp. 367-372

Author(s):

J. Meier ◽

T. Neymann ◽

T. Melin

Keyword(s):

Landfill Leachate ◽

Cross Flow ◽

Pilot Scale ◽

Experimental Results ◽

Permeate Flux ◽

Leachate Treatment ◽

Side Pressure ◽

New Process ◽

Major Factors ◽

Process Combination

A new process combination integrating adsorption on powdered adsorbent into a nanofiltration process is applied to landfill leachate treatment on a pilot scale. Lab scale experiments have shown that the permeate flux is significantly increased by the application of a flushing procedure combining permeate back flushing and feed and air cross flow flushing. In this paper an optimisation strategy for the flushing procedure is described and first experimental results are presented. These results indicate that the cross flow flushing velocity and the number of permeate side pressure pulses are the major factors of the flushing procedure.

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Effect of feed pattern of landfill leachate on water reduction in constructed wetland in Southeast Asia

Water Practice & Technology ◽

10.2166/wpt.2015.079 ◽

2015 ◽

Vol 10 (4) ◽

pp. 669-673 ◽

Cited By ~ 1

Author(s):

Yuka Ogata ◽

Tomonori Ishigaki ◽

Yoshitaka Ebie ◽

Noppharit Sutthasil ◽

Chart Chiemchaisri ◽

...

Keyword(s):

Southeast Asia ◽

Constructed Wetland ◽

Landfill Leachate ◽

Low Cost ◽

Free Water ◽

Pilot Scale ◽

Leachate Treatment ◽

Tropical Regions ◽

Water Reduction ◽

Landfill Management

To improve landfill management in Southeast Asia, reduction of landfill leachate volume with low cost and easy operation is required. The present study attempted to utilize constructed wetland (CW) for reduction of landfill leachate by evapotranspiration. The objective of this study is to evaluate the influence of operation and season on evapotranspiration of CW applied to landfill leachate treatment in tropical regions. The pilot-scale CW planted with cattail was constructed in Sainoi landfill site, Thailand. CW could siginificantly reduce the leachate volume by the evapotranspiration in daytime than nighttime. Frequent inflow of horizontal subsurface flow (HSSF) during daytime resulted in active evapotranspiration. Evapotranspiration of CW in HSSF with high frequency of inflow showed the similar that in free water surface (FWS). Throughout the year including both rainy and dry seasons, evapotranspiration of CW were significantly higher than the evaporation volume which is regarded as water reduction by existing landfill leachate treatment, i.e. stabilization pond. CW should be served as the techonology for appropriate management of landfill leachate in Southeast Asia.

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