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Managing Wastewater System Capacity
- Essential for growth and economic development
- Important for meeting water quality standards
- Protects wastewater system
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Discharge Limits for Wastewater Biochemical Oxygen Demand (BOD) - - PowerPoint PPT Presentation
Discharge Limits for Wastewater Biochemical Oxygen Demand (BOD) - - PowerPoint PPT Presentation
Discharge Limits for Wastewater Biochemical Oxygen Demand (BOD) Nancy Nye Pretreatment Program Manager August 2019 Managing Wastewater System Capacity Essential for growth and economic development Important for meeting water quality
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Managing Wastewater System Capacity
- Expand wastewater systems
- Revise standards for incoming industrial streams
El Paso Water is in the process of doing both.
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EPWater Wastewater Treatment Facilities
- Operate under TPDES permits or
TCEQ Permit (Hervey)
- BOD treated through activated sludge
and aeration systems
- Discharge into the Rio Grande, or the
Hueco Bolson (Hervey)
- Some effluent used as reclaimed water
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Definition of Biochemical Oxygen Demand (BOD)
The amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.
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Wastewater Treatment
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EPWater must act to ensure compliance
- Potential violation
- Enforcement
- New requirements
- Permit revoked or denied
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Inadequately treated wastewater poses a biological contaminants risk– A health hazard if discharged into the environment.
Common BOD Concentrations Weak 100 mg/L Medium 200 mg/L Strong 300 mg/L
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Wastewater Treatment Facilities Current Capacities
Plant BOD Average Loading (lbs/day) TCEQ 317 Design Standard (lbs/day) BOD Design Standard (percent) John T. Hickerson WRF 19,400 21,000 92% Haskell R. Street WWTP 29,400 29,700 99% Roberto R. Bustamante WWTP 52,800 38,700 136% Fred Hervey WRP 12,000 21,400 56%
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Most municipal wastewater treatment facilities are not designed to treat wastewater from industrial sources.
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The Pretreatment Program requires discharges of nondomestic wastewater to comply with standards to ensure the goals of the Clean Water Act are attained.
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Pretreatment Program
- Prevent interference
- Prevent pass through
- Improve opportunities to recycle and reclaim
- Protect human health & safety and the environment
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Pretreatment Program
Permit Inspection Sample Collection & Lab Analysis Enforcement
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Pretreatment Program
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- Continuous evaluation
- Revision to local limits
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Treatment or process changes will be needed.
Industrial sectors most impacted by BOD:
- Dairy products processing
- Other foods processing
- Industrial Laundry facilities
- Waste dewatering processes
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Actions needed by Industrial Customers
- Identify source(s) of high BOD
- Evaluate BMPs to reduce BOD
- Identify the type of treatment equipment required
- Plan for treatment to reduce BOD below 300 mg/L and implement
before August 2020 to be compliant
RESOURCES: Companies are encouraged to seek guidance from trade associations, The Water Environment Federation, engineering consultants, and The TCEQ to learn more and identify facility specific solutions.
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Timeline
Exceedances will be subject to enforcement.
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Change to BOD planned
AUG 2019
Surcharge rate for BOD Is amended
DEC 2019 MAR 2020
New Surcharge rate in effect
JUL 2020
Industrial customers must meet BOD Limit (surcharge will cease)
AUG 2020
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A national challenge
Expansions and new limits to manage capacity
Cities that have recently set BOD and/or TSS limits
- City of Temple, TX
- City of Melbourne, Florida
- City of Flagstaff, AZ
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Mission Linen & Uniform Services has been treating their wastewater for over 20 years.
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“We’d rather put money into our infrastructure than paying surcharges.”- Brandon Wellette, Production Manager. Mark Saposnik, Environmental Compliance Engineer, said the system benefits their bottom line, but “It is also the right thing to do for the environment.”
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The cooperation of our industrial customers will help us to meet future demand and continue to protect the environment and our systems.
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Nancy Nye Pretreatment Program Manager (915)594-5731 nenye@epwater.org
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