The landfill reinjection of concentrated leachate: Findings from a monitoring study at an Italian site

Removal of refractory organics in nanofiltration concentrates of municipal solid waste leachate treatment plants by combined Fenton oxidative-coagulation with photo – Fenton processes

“…Although the combined processes could produce a purified permeate in compliance to legislative discharge standards, the production of leachate brine (LB) from nanofiltration is an important drawback. LB typically represents 13e30% of the volume of the incoming landfill leachate, and contains an extremely wide variety of biologically-stabilized pollutants with concentrations ranging several orders of magnitude (ng/L-mg/L) (Bruggen et al, 2003;Calabro et al, 2010;He et al, 2015). The concentration of dissolved organic matter (DOM) may be several thousand mg/L (Wang et al, 2012).…”

Effect of Fenton oxidation on biodegradability, biotoxicity and dissolved organic matter distribution of concentrated landfill leachate derived from a membrane process

“…Large volume of concentrated leachate is generated from the pressure-driven membrane process separating into a purified permeate fraction and a concentrated retentate fraction, especially during the RO process. Normally, the concentrated retentate leachate produced from pressure-driven membrane process represents typically 13-30% of total incoming landfill leachate (Bruggen et al, 2003;Zhang et al, 2009;Calabrò et al, 2010). Concentrated leachate is a kind of brown solution with high chemical oxygen demand (COD) and low ratio of five-day biochemical oxygen demand (BOD 5 ) to COD (Calabrò et al, 2010).…”

“…Normally, the concentrated retentate leachate produced from pressure-driven membrane process represents typically 13-30% of total incoming landfill leachate (Bruggen et al, 2003;Zhang et al, 2009;Calabrò et al, 2010). Concentrated leachate is a kind of brown solution with high chemical oxygen demand (COD) and low ratio of five-day biochemical oxygen demand (BOD 5 ) to COD (Calabrò et al, 2010). Recalcitrant organic matter including humic acid (HA), fulvic acid (FA), aromatic compounds, long-chain hydrocarbons and halohydrocarbons is abundant in concentrated leachate and poses potential hazards to the surrounding environment (Zhang et al, 2013).…”

Treatment of nanofiltration concentrates of mature landfill leachate by a coupled process of coagulation and internal micro-electrolysis adding hydrogen peroxide

“…[13,14] However, as reported in a 30-month reinjection study, although the daily production of the raw leachate did not appear to increase, a few critical components such as chemical oxygen demand (COD) and heavy metals became more prevalent; besides, methanogenic activity in the landifill site was also inhibited during this monitoring period. [15] Furthermore, the accumulation of pollutants can depress the operating performance of the membrane unit and accelerate the ageing process of a landfill site. The application of vapourization has also been limited because of the high cost of equipment and high energy consumption.…”