esm223_11_Reading_Keller_lagoons_lecture

esm223_11_Reading_Keller_lagoons_lecture - ESM 223 Organic...

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1 1 ESM 223 Organic Matter & Nutrient Removal 2 Lagoon Treatment Systems ± Aerobic ± Facultative ± Anaerobic
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2 3 Facultative Lagoon Alternatives ± Partial-mix aerated 4 Lagoon Treatment Systems ± Advantages ± Low capital costs ± Minimum operations and skills needed ± Sludge withdrawal at 10- to 20-yr intervals ± Compatible with land and other aquatic treatment processes
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3 5 Lagoon Treatment Systems ± Disadvantages ± Large land area ± High concentrations of algae ± Cannot meet stringent effluent limits ± Can impact groundwater if liners are not used or liners are damaged ± Odor issues (if improperly designed or operated) 6
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4 7 8 Residential Lagoon Treatment
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5 9 Lagoon Health Anaerobic conditions may exist, so the lagoon is not treating waste water well. Odors are probably present. Very bad Gray or black Either there is soil in the water from bank erosion or algae with different pigmentation are present. Questionable Tan,brown or red Undesirable type of algae (blue-green, filamentous algae) becoming dominant, indicating poor conditions. Dissolved oxygen levels and pH are dropping. Not very good Dull green or yellowish Good conditions; plenty of algae are present. Good Blight rich green Comments Health of lagoon Color 10 Processes in a Lagoon
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6 11 Processes in a Lagoon ± BOD Removal: bacterial oxidation ± TSS Removal: sedimentation ± Intermittent sand filter ± Rock filter ± Constructed wetland ± Nitrogen Removal: volatilization of NH 3 , algal uptake, bacterial denitrification ± Phosphorus Removal: alum or ferric chloride needed to go below 1 mg/L 12 Lagoon Performance
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7 13 Lagoon Performance 14 Lagoon Performance ± Pathogen Removal: long detention times ± natural die-off, predation, sediment., adsorption
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8 15 Lagoon Systems ± Design factors ± Influent BOD, N, P concentrations ± Effluent objectives ± Average air temperature for coldest month ± Mixing vs. plug flow operation ± pH, alkalinity ± Vegetative growth control ± Pumping requirements 16 Advanced Integrated Lagoon
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9 17 Advanced Integrated Lagoon 18 Advanced Integrated Lagoon
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10 19 Lagoon Design Parameters ± Population: ± 1,000 Summer ± 330 Winter
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esm223_11_Reading_Keller_lagoons_lecture - ESM 223 Organic...

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