Lab-scale Liquid Injection Model of Bioreactor Landfill

摘要

A lab-scale physical model of a bioreactor landfill with liquid recirculation is developed. The landfill model is 86 cm long × 30 cm wide × 56 cm high. A 50 cm long × 30 cm wide × 2 cm thick horizontal permeable blanket made up of pea gavel is built in the model for subsurface liquid injection. Deionized water injection in the blanket was monitored by pressure, flow, and water content sensors for injection rates ranging from 16.5 to 23.5 cm~3/s. Fine sand was used to simulate "waste" material. When water was injected in the blanket, all pressure transducers in the blanket registered increase in the pressure head and the pressure heads increased or decreased as the injection flow rate was varied. The increase in the pressure head was earliest and greatest for the sensor located closest to the liquid injection pipe. The sensor responses for the blanket in the lab-scale landfill model were similar to those in an instrumented field-scale (55 m long × 9 m wide × 0.15 m thick) crushed recycled glass blanket located in Michigan.