Water Journal : Water Journal November 2014
WATER BUSINESS WATER NOVEMBER 2014 84 Water Business HACH BIOTECTOR B7000 TOC ANALYSER Hach BioTector TOC Analysers provide maximum uptime and reliability due to a patented self-cleaning oxidation technology that easily handles dif cult samples and signi cantly reduces maintenance. Unlike traditional TOC analysers, the BioTector eliminates build-up issues from salts, particulates, fats, oils and greases that lead to drift and high maintenance. With reliable, continuous monitoring and real-time process control, plant operators can optimise their processes to lower overall plant operating costs. The most advanced system in its class, BioTector products achieve precise results from the simplest to the most demanding applications. With patented two-stage advanced oxidation technology, the Biotector handles even the most challenging applications involving fats, oils, greases, salts, sludge, and particulates. Oversized tubing eliminates ltration and sample contamination. There's minimal maintenance, no calibration or operator intervention is required between service intervals, and it provides a quick pay-back with cost savings in chemical dosing, waste reduction and optimised processes. Con gurations are available for TOC, TOC/TN, and TOC/TN/TP. Please see your local Hach representative for details. BIOFILTRATION FOR EMISSION AND ODOUR CONTROL "Odours constitute the largest area of air quality-related complaints for all Australian and New Zealand regulatory authorities." (Clean Air Society of Australia and New Zealand). It is generally accepted that there is no single panacea odour control technology. However, bio ltration is emerging as a versatile solution due to its ability to adapt to a wide variety of Volatile Organic Compounds (VOCs), in that appropriate bacteria will naturally colonise bio lter media in response to the VOCs that are introduced. Early bio lters were open bed (soil bed) type facilities. They were often poorly designed, had limited media options, required high-maintenance and subsequently often delivered poor performance. Over time, soil beds evolved and improved but were still constrained by their fundamental design. The bio lter concept evolved further and was con gured as a "packaged bio lter", with the media contained within a vessel. There has now been a speci c development of packaged bio lter technology - FiltaOdor. The principal of bio ltration Bio- ltration is the removal and oxidation of VOCs by microorganisms. The air ows through a packed bed and the pollutant transfers into a material that is biologically active, the biomass. Microorganisms, including a consortium of bacteria and fungi, are immobilised in the bio lm and degrade the pollutant. An ideal environment must be maintained to ensure a robust biomass. Comparison of soil beds with FiltaOdor Following is a comparison of soil beds with the FiltaOdor bio lter in terms of the Key Operating Parameters. It is acknowledged that many packaged bio lter designs have addressed some of the shortcomings of soil beds to varying degrees; however, the FiltaOdor design comprehensively addresses all shortcomings. Bio ltration provides effective odour control by a natural process. FiltaOdor Flow velocity and rate SOIL BED FILTAODOR Air ow resistance of media restricts media depth, resulting in a large footprint to achieve the necessary media volume, and limiting where on site the soil bed can be positioned. Very low air ow resistance of media allows a deep bed and small footprint, thus providing greater exibility for positioning on-site. Humidi cation SOIL BED FILTAODOR It is common for soil beds to rely on irrigation alone to maintain media moisture levels. Integrated humidi er/irrigation system. Media moisture level is maintained at equilibrium via a process that allows excess moisture to fall out for recovery and recirculation. The media is not exposed to weather. Irrigation SOIL BED FILTAODOR Typically rely on timer-based systems with lawn watering type sprinkler heads. No automated control of media moisture content. Incorporates a "wobbler" sprayer, creating heavy droplets and an irregular spray pattern to provide even coverage. Excess moisture freely drains from the media so that saturation is avoided and optimum moisture content is maintained. Diffusion SOIL BED FILTAODOR Typically have slotted pipes in granular bedding, subject to blocking with degraded organic media. Bark/woodchip-based media is highly bioavailable and degrades rapidly, becoming compacted and restricting air ow. Also subject to weed growth, with roots interfering with air ow and often penetrating the slotted pipes. Air ow introduced via an unrestricted void space (plenum). Media is a combination of an organic bre and a mineral media working cohesively to create even diffusion and moisture retention. The media has very low biodegradability.
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