Treatment of municipal landfill leachate using a combined anaerobic digester and activated sludge system

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2010.01.021· OSTI ID:21357671

Kheradmand, S ^[1]; Karimi-Jashni, A ^[1]; Sartaj, M ^[2]

---

1. Department of Civil and Environmental Engineering, University of Shiraz, Shiraz 7134851156 (Iran, Islamic Republic of)
2. Department of Civil Engineering, Isfahan University of Technology, Isfahan 841568311 (Iran, Islamic Republic of)

The main objective of this study was to assess the feasibility of treating sanitary landfill leachate using a combined anaerobic and activated sludge system. A high-strength leachate from Shiraz municipal landfill site was treated using this system. A two-stage laboratory-scale anaerobic digester under mesophilic conditions and an activated sludge unit were used. Landfill leachate composition and characteristics varied considerably during 8 months experiment (COD concentrations of 48,552-62,150 mg/L). It was found that the system could reduce the COD of the leachate by 94% at a loading rate of 2.25 g COD/L/d and 93% at loading rate of 3.37 g COD/L/d. The anaerobic digester treatment was quite effective in removing Fe, Cu, Mn, and Ni. However, in the case of Zn, removal efficiency was about 50%. For the rest of the HMs the removal efficiencies were in the range 88.8-99.9%. Ammonia reduction did not occur in anaerobic digesters. Anaerobic reactors increased alkalinity about 3.2-4.8% in the 1st digester and 1.8-7.9% in the 2nd digester. In activated sludge unit, alkalinity and ammonia removal efficiency were 49-60% and 48.6-64.7%, respectively. Methane production rate was in the range of 0.02-0.04, 0.04-0.07, and 0.02-0.04 L/g COD{sub rem} for the 1st digester, the 2nd digester, and combination of both digesters, respectively; the methane content of the biogas varied between 60% and 63%.

• OSTI ID: 21357671
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 6 Vol. 30; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
ACID NEUTRALIZING CAPACITY
ALKANES
AMMONIA
ANAEROBIC CONDITIONS
CHEMISTRY
DISPERSIONS
EFFICIENCY
ELEMENTS
HOMOGENEOUS MIXTURES
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
LEACHATES
LOADING RATE
MANAGEMENT
MESOPHILIC CONDITIONS
METHANE
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
SANITARY LANDFILLS
SLUDGES
SOLUTIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WATER CHEMISTRY