Biological leachate treatment processes

The key issues in developing an effective biological landfill leachate treatment process are the following ... 

Case 2 Comparison of Two Biological Treatment Processes Using Attached-Growth Biomass for Sanitary Landfill Leachate Treatment... 

Loukidou, M.X. and Zouboulis, A.I., Comparison of two biological treatment processes using attached-growth biomass for sanitary landfill leachate treatment, Environ. Pollut., Ill, 273-281, 2000. 

Methods developed for treatment of landfill leachates can be classified as physical, chemical and biological, which are usually used in combinations in order to improve the treatment efficiency. Biological treatment methods used for the leachate treatment can be classified as aerobic, anaerobic and anoxic processes which are... 

Otto Aqua-Tech HCR [High-Capacity Reactor] A high-intensity biological treatment process for purifying effluents from food processing, certain industrial processes, and landfill leachate. The waste is circulated rapidly through a vertical loop reactor, and air is injected at the top. Invented at the Technical University of Clausthal-Zellerfeld developed and commercialized by Otto Oeko-Tech. Eleven plants had been installed in Germany and Italy by 1991. See also Deep Shaft, Biobor HSR. 

Treatments of landfill leachate in a two-stage RO system with biological pre-treatment have been also proposed (Linde et al., 1995). In this case tubular membranes were used in the first step to reduce membrane fouling of RO spiral wound membranes used in the second stage. An improvement of this process can be obtained by replacing the RO unit in the first stage by a NF unit with a consequent decrease in operating costs (Peters, 1998). 

If leachate is released from a hazardous waste landfill, it may be necessary to install a leachate treatment system. Such a facility is a sophisticated wastewater treatment system using biological, physical, and chemical treatment processes as described in Chapter 5. 

Ried A, Mielcke J (1999) The State of Development and Operational Experience Gained with Processing Leachate with a Combination of Ozone and Biological Treatment, Proceedings of the 14lh Ozone World Congress. 

Biological treatment has been reviewed in section 9.3.2 and depends on the organic content of the waste. It can include aerobic or anaerobic processes. The anaerobic system supplying potentially useful methane is the most difficult to control efficiently, with operational problems that relate to the handling of solids and leachate, and the harnessing of gas yields. 

Treatment of contaminated liquids such as water, leachate, filtrate, groimdwater, storm water, surface water and industrial process waste water can be accomplished by several of SBP s technologies. Certain waste streams can be concentrated by the hyperfiltration units the permeate is clean water and the "ctMicentrate" contains the reduced volume of the pollutants. These concentrated contaminants can often be bioremediated, thus minimizing the waste stream. Other liquids may be treated directly, either by biological processes, or in the case of volatiles, air stripping with biotreatment of the pollutants in a gas phase bioreactor, or "biofilter". 

---