Pilot-scale experiment on anaerobic bioreactor landfills in China

Treatment of mature landfill leachate by biofilters and Fenton oxidation

“…Previous studies have shown that aged refuse has a stronger capability of converting refractory organic substances, COD and ammonia in leachate or other kinds of wastewater by attaching a large quantity and variety of microorganisms, and that a biofilter packed with aged refuse can last long, while TP remove was mostly contributed to the adsorption by aged refuse (Zhao et al, 2002;Jiang et al, 2007). However, the remaining effluent COD still exceeds emission standards, and defies biological treatment because the effluent BOD 5 to COD ratio is only 0.04 and most COD are attributable to non-degradable organic substances, necessitating further treatment methods such as Fenton reagent oxidation (Kochany and Lipczynska-Kochany, 2009).…”

“…Fortunately, biological methods like the activated sludge, the upper anaerobic sludge bed and landfill treatment have proved efficient in removing leachate pollutants (Castillo et al, 2007;He et al, 2007;Yang and Zhou, 2008). Recently, biofilters based on aged refuse, a well bio-stabilized refuse through years in the landfill, has been reported as practical and operational in leachate treatment due to high efficiency in pollutant removal and low cost (Jiang et al, 2007;Long et al, 2008). However, in case of mature landfill leachate, which contains a large amount of refractory organics and low BOD 5 /COD ratio (Berge et al, 2006), biological process solely is hard to meet strict discharge standards, other methods of leachate treatment become necessary to combine the series of processes (Claudio and Roberto, 2006;Li et al, 2009).…”

Treatment of landfill waste, leachate and landfill gas: A review

“…Higher rates of leachate recirculation accelerate waste degradation. A higher rate may leach out large amounts of organic matter, reducing biological methane potential [12]. This decreases the time for stabilization.…”

Comparison of semi-aerobic and anaerobic degradation of refuse with recirculation after leachate treatment by aged refuse bioreactor

“…The TP concentration in F1 continued to fluctuate between 1 and 3 mg/L until the end of the experiment. Jiang et al (2007) reported that TP concentration increased first, then stabilized at a constant level of 20-30 mg/L for anaerobic microbes have relatively low phosphorus requirements and concluded that anaerobic bioreactor landfills are able to remove little or no phosphorous. Erses et al (2008) found that the initial concentration of orthophosphate in the aerobic reactor was higher than an anaerobic reactor, but at the end of the experiment, the concentration of orthophosphate in the aerobic reactor was lower than an anaerobic reactor.…”