The landfill leachate treatment system inevitably will consist of processes that generate sludge. This sludge must be disposed in a way that minimizes its environmental impacts. The objective of this work is to evaluate the impact of co-disposal of sludge generated in leachate treatment plant with household solid waste (HSW). The sludges from leachate treatment evaluated in the present work were generated in a forced evaporation treatment system and in a lime treatment step. Nine cells simulating landfill were set up to evaluate the impact of sludge co-disposal with HSW. During 225 d of monitoring, the results showed that the cells were in the acid phase of waste degradation and, for all parameters except chemical oxygen demand (COD) and total organic carbon (TOC), the cells showed similar behavior to the control cells. Leachate from co-disposal cells E (evaporator sludge) presented greater COD and TOC than leachate from control cells (cell C), which in turn presented greater values than leachates from co-disposal cells L (lime sludge). The higher content of organic matter may have influenced waste degradation inside the cell with evaporator sludge. On the other hand, the lime in sludge may have reacted with organic matter inside the cells.
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