Indian Health Service Sanitation Facilities Construction Program Wastewater Lagoon Operation & Maintenance
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1 Indian Health Service Sanitation Facilities Construction Program Wastewater Lagoon Operation & Maintenance By: Christen P. Glime, P.E., District Engineer Santa Fe District Office, AAO, IHS
2 Indian Health Service Sanitation Facilities Construction Program Executive Branch (Federal Govt.) Department of Health & Human Services Surgeon General Dr. Regina Benjamin is the Head of the Public Health Service U.S. Public Health Service Indian Health Service Operating Divisions / Agencies Center for Disease Control & Prevention (CDC) Food & Drug Administration (FDA) National Institutes of Health (NIH) 9 Others (13 total)
3 Indian Health Service Sanitation Facilities Construction Program Albuquerque Area IHS: SFC Offices Ignacio Field Office Santa Fe District Office Albuquerque District Office Albuquerque AREA Office
4 Wastewater Lagoon Systems Overview Why Do We Use Lagoons for Wastewater Treatment? Operation and Maintenance Cost is Low To match technical and financial capacity of the utility Advantages of Lagoon Systems Low O&M Cost Financial & Technical capacity required is low Low operator certification level (Level 1) Ability to handle shock loads Disadvantages of Lagoon Systems Odors Aesthetics Large land area required Little control over treatment process Mosquitos
5 Wastewater Lagoon Systems Overview TYPES OF LAGOON SYSTEMS (Hydraulically): A. Total Retention Lagoon System B. Discharging Lagoon System Precipitation (IN) Evaporation (OUT) Evaporation (OUT) Wastewater (IN) Wastewater (IN) Effluent (OUT) No NPDES Permit Required NPDES Permit Required if discharging to water body
6 Wastewater Lagoon Systems Overview Discharging Lagoon Systems Typical Methods of Discharge: A: Direct discharge to river (NPDES Permit Required) B. Discharge to percolation cell, wetland, or land application system (EPA NPDES Permit may NOT Required)
7 Wastewater Lagoon Systems Overview Discharging Lagoon Systems Typical Methods Disinfection: A: Chlorination B. Chlorination/Dechlorination C. UV Disinfection typically wastewater from lagoons isn t clear enough for UV to be effective without some type of filtration D. Ozone
8 Wastewater Lagoon Systems Overview Discharging Lagoon Systems: Percolation Cell Design Considerations depth to groundwater Soil conditions; percolation rate Wastewater treatment quality prior to reaching groundwater Permit required? Class V Injection Well?
9 Wastewater Lagoon Systems Overview Discharging Lagoon Systems: Land Application System Design Considerations Drip irrigation vs. spraying sprinkler irrigation Wastewater Quality Crop Selection Soil conditions Storage capacity of lagoon to get through winter months Limit site access; signage Permit required?
10 Wastewater Lagoon Systems Overview TYPES OF LAGOON SYSTEMS (Treatment Types): Aerobic: typical for domestic WW (aerobic treatment) Facultative: typical for domestic WW (aerobic & anaerobic treatment) Anaerobic: used for high strength WW (anaerobic treatment) 4-8 feet deep 20 lbs/acre/day typical Up to lbs/acre/day in SW
11 Wastewater Lagoon Systems Overview Aerobic Lagoon Systems: Makes treatment more efficient than facultative Can decrease the footprint of the system vs. facultative typically discharge Try to keep minimum [DO] > 2 mg/l Fine bubble aerators and surface aspirating aerators are most common in lagoon systems Surface Aspirating Aeration: aeration equipment floats on lagoon surface and aerates lagoon Coarse Bubble Aeration: not as efficient as fine bubble Fine Bubble Aeration: more efficient than coarse bubble
12 Wastewater Lagoon Systems Overview How Facultative Lagoon Systems Work
13 Wastewater Lagoon System Design Total Retention Lagoon System: Typically lined with HDPE Liner Wastewater In + Precipitation In = Evaporation Out + Storage Need wastewater flow data projected for the design life of the lagoon system Need evaporation data for your area Do mass balance to size the lagoon system (how many acres?)
14 Wastewater Lagoon System Design Aerobic & Facultative Lagoon Systems: Obtain wastewater quality data (BOD, TSS, N, & P at a minimum) Size 1 st lagoon cell so that BOD loading is < 20 mg/l (may be able to go up to 60 to 100 mg/l in Southwest where freezing doesn t occur) for Facultative Treatment; higher for Aerobic treatment (based on aeration equipment manufacturer s literature) Configuration: Multiple cells for operational flexibility Set inlets and outlets to maximize retention time and reduce short circuiting
15 Wastewater Lagoon System Design Typical Design Issues and solutions Short Circuiting Problem: Decreased retention time, thus treatment Short Circuiting Can correct by: Changing piping configuration Installing baffles Move outlet piping Install baffles
16 Wastewater Lagoon System Design Typical Design Issues and solutions BOD Overloading of Primary Cell Problems: Changes cell from facultative towards anaerobic Caused odors Split flow from 1 cell to 3 cells or combine 3 cells into 1 (example) BOD Overloading of Primary Cell Can correct by: Increasing size of primary cell Splitting influent wastewater over more cells Aeration; perhaps pond circulators
17 Wastewater Lagoon System Design Typical Design Issues and solutions Lagoon Overflows Problems: Creates a public health issue Lagoon Overflows Can correct by: Increasing size of lagoon system Reducing inflow to lagoon system Discharging
18 Wastewater Lagoon System Design Typical Design Issues and solutions Lagoon Empty (Percolating) Problems: Wastewater seeping into ground with little or no treatment Possible groundwater contamination (nitrates, ammonia, BOD, etc.) Lagoon Empty (Percolating) Can correct by: Installing lagoon liner
19 Wastewater Lagoon System Operation & Maintenance Aerobic Lagoon Systems Only: A. Fine/Course Bubble Aeration Air compressor maintenance Air diffuser maintenance Air piping maintenance Ensure even distribution of bubbles Clearing clogged diffusers B. Surface Aspirating Aeration Mechanical equipment maintenance (based mostly on manufacturer s recommendations)
20 Wastewater Lagoon System Operation & Maintenance Facultative and Aerobic Lagoons: Weed Control must be cut; limits aeration by cutting down wind; permit for pesticides Flow Measurement Sludge Measurement sludge judge and row boat; pump when sludge depth is > 1/3 depth of lagoon Exercise transfer structure valves Know how the wastewater was DESIGNED to flow through your system and ensure that it is
21 Wastewater Lagoon System Operation & Maintenance Discharging Lagoons: A. Permit Requirements Wastewater Quality Testing (continuous sampler vs. grab samples) Flow Measurement (discharge volume) When does permit allow discharge (continuous vs. timed releases) Disinfection? Discharge Monitoring Reports (DMR s) Discharging Lagoons: A. Typical Testing Parameters for NPDES Permits BOD, TSS, P, NH 3, Fecal Coliforms Others (ph, temp, DO, alkalinity, etc.)
22 Wastewater Lagoon System Operation & Maintenance Daily Inspections A. Typical Permit Requirements Weekly inspection Discharge status Freeboard measurement Presence of animal burrows Erosion issues Vegetation Date/time of inspection Initials/name of inspector Corrective actions
23 Wastewater Lagoon System Operation & Maintenance EPA Self Inspection Booklets
24 References EPA Internet Sources IHS SFC Handbook II: Project Planning & Engineering
25 By: Christen P. Glime, P.E., District Engineer Santa Fe District Office, AAO, HIS Questions?
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