STUDI KEMAMPUAN VERTICAL SUBSURFACE FLOW CONSTRUCTED WETLANDS DALAM MENYISIHKAN COD, NITRIT, DAN NITRAT PADA AIR LINDI (STUDI KASUS: TPA NGRONGGO, SALATIGA)

Abstract

ABSTRACT

Leachate is one of resulting negative impact from landfilling in Indonesia. In common  leachate   containing an organic and inorganic matter with high concentration. Therefore, treatment of the leachate is essential  before  it  could  be  discharged  directly  into  the receiving water bodies. One of technology to treat landfill leachate which is by use of biological treatment. But this processing apparently is still result organic and inorganic content one high enough. Therefore, necessary continuing processing alternative which is by use of system Constructed Wetlands.  This research intent to know decrease of concentration COD, nitrit and nitrate, and removal efficiency on system Vertical Subsurface Flow Constructed Wetlands  by use of plant Scirpus grossus.  Besides that, the impact of variation amount plants and residence time would  be analized. The laboratory research was conducted with use 4 reactors. Reactor A with 4 plants, reactor B with 6 plants, reactor C with 8 plants, and rector C without plant. Four of the reactors operated at a flow rate of 10,5 ml / minutes for residence time 3 days, 5,3 ml / minutes for residence time 6 days, and 3,5 ml / minutes for residence time 9 days. System Vertical Subsurface Flow Constructed Wetlands  by use of plant Scirpus grossus  (lingi) can removal concentration of COD, nitrit, and nitrate. The highest removal efficiency for COD, nitrit and nitrat were 63,4%, 57,6%, and 59,0% respectively. All of them was reached by reactor C with residence time 9 days. Besides that, decrease concentrations COD, nitrit and nitrate on system Vertical Subsurface Flow Constructed Wetlands  regarded by amount plants and residence time.