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  • Anaerobic Soil Impairs Sprayfield in Ellensburg, WA
    s wastewater treatment plant is the high level of oxygen demanding constituents as measured by COD and especially BOD This results from the sugary juice of the fresh corn being processed Sent to the plant it requires more aeration that the treatment plant is capable of delivering equipment too expensive to install and operate for the short time period it is needed This makes land application the more economical choice for wastewater treatment Elevated manganese and iron in the monitoring wells corroborates that oxygen demanding constituents in the wastewater are having undesirable effects on the soil A Department inspection during November 1991 documented the presence of alternating layers of anaerobic and aerobic soil in augered boreholes Anaerobic conditions were found to extend down into shallow groundwater In areas where groundwater was observed to be seeping into surface water Tjossem Ditch Blossum Pond and a backwater of the Yakima River orange staining of iron bacteria and insoluble iron oxide converted from soluble ferrous iron in the groundwater was observed at several locations Shallow groundwater concentrations of ferrous iron and manganese exceed State groundwater standards beneath the sprayfield during at least part of each year added 2009 07 30 Anaerobic soil reduces sprayfield nutrient treatment capacity and it results in plumes of anaerobic groundwater laden with reduced constituents This condition can harbor and nurture common disease organisms that would otherwise do poorly in aerobic groundwater Anaerobic sprayfields are generally not permitted by Washington Department of Ecology due to public health and safety concerns On the other hand inducing anaerobic soil and discharging anaerobic groundwater are not specifically prohibited by law necessitating a pragmatic regulatory response This can allow anaerobic problems to persist year after year as they have at this location Consider the pattern of hydraulic blinding visible in the aerial photo

    Original URL path: http://landprofile.com/Anaerobic-Soil-Impairs-Sprayfield-in-Ellensburg.html (2016-04-26)
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  • BOD Overload at Cheese Processor Sprayfield
    case with high strength wastewater and professional judgement is required to distinguish when further consideration is warranted When in doubt have a qualified soil scientist evaluate soil based BOD treatment capacity Startup design for this wastewater sprayfield near Lacey WA was intended to closely match expanded cheese processing operations to sprayfield capacity However the design team failed to mitigate for the risk of anaerobic failure resulting in the hydraulic blinding

    Original URL path: http://landprofile.com/BOD-Overload-at-Cheese-Processor-Sprayfield.html (2016-04-26)
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