Jefferson County Village Creek Water Reclamation Facility Birmingham

1. INTRODUCTION

The Village Creek Water Reclamation Facility (VCWRF) serves as the flagship infrastructure asset for Jefferson County Environmental Services, operating as the largest wastewater treatment plant in the Birmingham metropolitan area. Treating an average daily flow of approximately 45 million gallons (MGD) and serving a population equivalent of over 250,000 residents, the facility is critical to the environmental health of the Black Warrior River basin.

Originally commissioned in the mid-20th century and substantially expanded following the county’s 1996 Consent Decree, Village Creek is an engineering marvel regarding hydraulic peaking factors. Due to significant Inflow and Infiltration (I/I) in the collection system, the plant is engineered to handle peak wet weather flows up to 480 MGD—an 8:1 peaking factor that requires massive on-site storage and high-rate treatment capabilities. Following over $100 million in recent capital improvements, including a transition to UV disinfection and advanced solids handling, Village Creek represents a case study in modernizing legacy infrastructure for resilience and regulatory compliance.

2. FACILITY OVERVIEW

A. Service Area & Coverage

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The VCWRF serves the Village Creek watershed, which encompasses the heart of the City of Birmingham and surrounding municipalities including Tarrant, Irondale, Mountain Brook, and parts of Adamsville. The service area is heavily urbanized, consisting of a mix of dense residential neighborhoods, commercial districts, and significant industrial zones. The collection system feeding the plant is gravity-dominated, following the natural topography of the Village Creek basin, augmented by major pump stations.

B. Operational Capacity

The facility operates with a design average daily flow of 60 MGD. However, the defining characteristic of Village Creek is its wet-weather management. Historical data indicates average dry weather flows range between 30–40 MGD. During heavy precipitation events common to the Southeast, the facility activates its Peak Flow Wastewater Treatment (PFWT) protocols. The plant utilizes extensive equalization basins (flow storage) to manage hydraulic surges that can exceed 360 MGD, preventing sanitary sewer overflows (SSOs) into the local watershed.

C. Discharge & Compliance

Treated effluent is discharged into Village Creek, a tributary of the Locust Fork of the Black Warrior River. The discharge is regulated under NPDES Permit AL0023655 administered by the Alabama Department of Environmental Management (ADEM). Given the low dilution factor of the receiving stream during dry months, the facility must meet stringent limits for Carbonaceous Biochemical Oxygen Demand (CBOD), Total Suspended Solids (TSS), Ammonia-Nitrogen, and Dissolved Oxygen (DO).

3. TREATMENT PROCESS

A. PRELIMINARY TREATMENT

Influent wastewater enters the headworks where it passes through coarse mechanical bar screens to remove large debris, rags, and plastics. This is followed by fine screening to protect downstream pumps. Grit removal is accomplished using vortex grit chambers, which use centrifugal force to separate heavy inorganic solids (sand, gravel, coffee grounds) from the organic wastewater. The removed grit and screenings are washed, compacted, and transported to a landfill. Recent upgrades have focused on odor control at the headworks using chemical scrubbers to mitigate impacts on the surrounding Ensley community.

B. PRIMARY TREATMENT

Flow proceeds to primary clarification, consisting of multiple large circular clarifiers. Here, flow velocity is reduced to allow settleable solids to drop to the bottom as primary sludge, while grease and oils float to the surface for skimming. The primary clarifiers typically achieve 50-60% TSS removal and 30-40% BOD removal, significantly reducing the organic load on the secondary biological system.

C. SECONDARY TREATMENT

The heart of the VCWRF is its activated sludge system. The facility utilizes a conventional activated sludge process with plug-flow aeration basins.

• Aeration: The basins are equipped with fine-bubble diffused aeration systems to maximize oxygen transfer efficiency. Large centrifugal blowers supply the necessary air to maintain aerobic conditions for the biomass.
• Clarification: Mixed liquor flows to secondary clarifiers where the biological floc settles. A portion of the settled solids is returned to the head of the aeration basins as Return Activated Sludge (RAS), while the excess biomass is removed as Waste Activated Sludge (WAS).

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D. WET WEATHER / PEAK FLOW MANAGEMENT

Unique to this facility is its high-rate treatment capability for wet weather. When flows exceed biological treatment capacity, excess flow is diverted to massive equalization (EQ) basins. If EQ capacity is reached, the facility can utilize chemically enhanced primary treatment (CEPT) or auxiliary treatment trains to settle solids and disinfect the water before blending it with full secondary effluent, ensuring the final discharge remains within permit limits.

E. DISINFECTION

In a major safety and environmental upgrade completed circa 2018-2020, Village Creek transitioned from gaseous chlorine to Ultraviolet (UV) Disinfection. The UV system eliminates the hazards associated with storing bulk chlorine gas in an urban area and removes the need for dechlorination chemicals (sulfur dioxide). The UV channels provide high-intensity light that alters the DNA of pathogens, preventing reproduction. For extreme peak flow events, the facility maintains provisions for auxiliary chemical disinfection (Peracetic Acid or Sodium Hypochlorite) if turbidity exceeds UV effectiveness limits.

F. SOLIDS HANDLING

Solids handling at Village Creek has undergone significant modernization:

• Thickening: Primary sludge and WAS are thickened (using gravity thickeners and rotary drum thickeners/DAF) to reduce volume.
• Digestion: Thickened sludge is stabilized in anaerobic digesters. The process operates at mesophilic temperatures, reducing volatile solids and producing biogas.
• Dewatering: The facility recently replaced aging belt filter presses with Screw Presses. Screw presses offer higher energy efficiency, lower water usage, and drier cake solids.
• Disposal: The dewatered cake is transported to permitted landfills or used for beneficial land application where regulations allow.

4. INFRASTRUCTURE & FACILITIES

A. Physical Plant & Power Generation

The site spans over 100 acres in the Ensley neighborhood. A critical component of the infrastructure is the Standby Power Generation Facility. Due to the strict requirements of the Consent Decree and the risk of SSOs during storms (which often coincide with power outages), Village Creek houses a massive bank of diesel generators capable of running the entire plant, including the energy-intensive influent pumps, independent of the grid. This ensures 100% operational reliability.

B. Energy Systems

Energy management is a priority for Jefferson County ESD. The aeration blowers typically account for 50-60% of the plant’s electrical load. Recent capital projects have focused on replacing older centrifugal blowers with high-efficiency turbo blowers or magnetically levitated bearing blowers, integrated with Dissolved Oxygen (DO) control loops to match air supply precisely with biological demand.

C. Odor Control

Given the facility’s location near residential zones and the historic Village Creek trail, odor control is paramount. The plant utilizes dual-stage chemical scrubbers and activated carbon adsorption units at high-generation points, specifically the headworks, primary clarifiers, and solids handling building.

5. RECENT UPGRADES & MAJOR PROJECTS

Upcoming Projects (2025-2027)

Future planning includes the Asset Management Program Implementation. Jefferson County is shifting from major capacity expansion to aggressive rehabilitation of structural concrete and electrical switchgear, much of which dates to the 1970s and 80s upgrades. There are also preliminary studies regarding nutrient removal optimization to meet potential future Total Nitrogen (TN) and Total Phosphorus (TP) limits.

6. REGULATORY COMPLIANCE & ENVIRONMENTAL PERFORMANCE

Permit AL0023655 dictates strict effluent limitations. The facility has maintained a strong compliance record in recent years, a significant turnaround from the era preceding the 1996 Consent Decree.

• CBOD5: Consistently averages < 5.0 mg/L (Limit typically 10-15 mg/L).
• TSS: Consistently averages < 10 mg/L.
• Ammonia (NH3-N): High removal efficiency (>95%) achieved through nitrification in the aeration basins.
• Consent Decree Status: While the massive capital spend associated with the 1996 Consent Decree (which led to the county’s bankruptcy filing in 2011) is largely complete, the facility remains under strict scrutiny to maintain the gains made in preventing sanitary sewer overflows (SSOs).

7. OPERATIONAL EXCELLENCE

Village Creek is staffed 24/7/365 by a team of Grade IV certified wastewater operators, maintenance mechanics, and laboratory technicians. The facility utilizes a robust SCADA (Supervisory Control and Data Acquisition) system that allows operators to monitor dissolved oxygen levels, pump statuses, and tank levels in real-time. The on-site laboratory is state-certified for specific parameters, allowing for immediate process control decisions, while compliance samples are often verified by external labs.

8. CHALLENGES & FUTURE PLANNING

Inflow and Infiltration (I/I): The primary engineering challenge remains the watertightness of the collection system. During heavy rains, the flow entering the plant spikes dramatically. While the plant has the hydraulic capacity to handle this, the sheer volume dilutes the biology and stresses the physical infrastructure. Continued investment in CIPP (Cured-in-Place Pipe) lining upstream is critical to plant operations.

Aging Infrastructure: As with many US facilities, concrete corrosion (H2S attack) in headworks and clarifiers requires ongoing capital for structural rehabilitation. The county’s comprehensive Asset Management Plan now prioritizes projects based on “Risk of Failure” vs. “Consequence of Failure” analysis.

9. COMMUNITY & REGIONAL IMPACT

The VCWRF is pivotal to the economic revitalization of Birmingham. By providing reliable sewer capacity, it supports commercial development in the downtown and northern districts. Environmentally, the improved effluent quality has contributed to the return of biodiversity in Village Creek, transforming it from a conveyance of pollution into a community asset bordered by the Village Creek Greenway trail system.

10. TECHNICAL SPECIFICATIONS SUMMARY

11. RELATED FACILITIES

The Village Creek system is supported by numerous remote pumping stations. It operates in conjunction with other major Jefferson County facilities, including the Valley Creek WRF (serving the southern basin) and the Five Mile Creek WRF. The county often balances solids handling strategies across these facilities to optimize efficiency.

12. FAQ SECTION

Technical Questions

1. What is the peak peaking factor for Village Creek?
The facility is designed for an unusually high peaking factor of approximately 8:1 (480 MGD peak vs 60 MGD average) to accommodate significant wet weather inflow from the older collection system.

2. Does Village Creek use chemical addition for treatment?
Yes, polymer is used for sludge thickening and dewatering. Chemicals may be used for pH adjustment or chemically enhanced primary settling during extreme flow events.

3. How are biosolids handled?
Biosolids are anaerobically digested and dewatered using screw presses. The resulting cake is hauled to a landfill, though the county explores beneficial reuse options.

4. Is the plant nutrient deficient?
Generally, no. The plant successfully nitrifies ammonia. Phosphorus limits are monitored, but biological phosphorus removal (BPR) is not the primary mode of operation currently.

Public Interest Questions

5. How many people does the plant serve?
The facility serves a population equivalent of over 250,000 residents in the greater Birmingham area.

6. Can the public tour the facility?
Jefferson County ESD occasionally hosts educational tours for schools and professional groups. Contact the Environmental Services Department directly for scheduling.

7. Does the plant smell?
While wastewater treatment naturally produces odors, Village Creek employs advanced chemical scrubbers and carbon filters to scrub air from the most odorous parts of the process, minimizing impact on neighbors.

8. Is the water released clean?
Yes. The discharged water meets strict state and federal standards and is often cleaner than the creek water it flows into, supporting local aquatic life.