City of LaGrange

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Water Treatment

Water Polution Control Division

Thursday, 01 October 2009 16:13 administrator
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OUR MISSION:   To safely and efficiently reclaim the community’s used water for the protection of human health and preservation of aquatic life.

OUR FUNCTIONS:

  • Operate & maintain the Long Cane Creek WPCP (Water Pollution Control Plant).
  • Operate & maintain the City’s wastewater pumping stations (18) and offline storage facilities (2).
  • Administer and enforce the Industrial Pretreatment Program.
  • Monitor wastewater treatment processes, industrial discharges, and receiving streams.
 
LONG CANE CREEK WPCP:    
Major Construction Milestones   Completed  Cost ($ million)
8.2 MGD Pure Oxygen AWT facility  July, 1986 22
  (to meet requirements of Clean Water Act)    
 Upgrade & expansion to 12.5 MGD    1992-94 27.1
(to meet new limits & provide growth)    
 

Treatment Processes:

The Long Cane Plant provides advanced wastewater treatment.  It has influent coarse and fine screening; grit removal; primary clarification with ferric chloride addition for phosphorus removal. Flow is then split between two biological treatment plants - a 7.5 MGD Pure Oxygen and a 5.0 MGD Carrousel each with its own secondary clarifiers, effluent filters, and chlorination.  The total discharge is then de chlorinated and pumped 11 miles to the Chattahoochee River at the confluence of Long Cane Creek.  There it is aerated and diffused under the river.  Sludge handling consists of thickening, belt filter presses, and lime stabilization.

 
NPDES Permit Limits: Parameter       Monthly Avg    Weekly Avg   
  FLOW (MGD)   12.5  15.6
  CBOD5  (mg/l)    10 15
  TSS (mg/l)  30 45
  NH3 - N (mg/l)  2 3
  TP (mg/l)  1 1.5
  FECAL COLIF.( #/100 ml) 200 400
  D.O. (mg/l)  6.0 (daily minimum)  
  pH (pHU)     6.0 (daily minimum)  
  TRC (mg/l) 0.39 (daily maximum)  
  Color;   Mercury monitor  
 

Compliance Record:  2 daily violations in the last 68 months.

INDUSTRIAL PRETREATMENT PROGRAM-The local program was approved by GA EPD in 1982 and implemented in 1984.  The City of LaGrangWPC is the Control Authority with oversight by EPD and EPA.  21 Significant Industrial Users are issued Discharge Permits with effluent limits, monitoring, and reporting requirements.
 

OUR OPERATING COSTS:  

     The annual operating budget for the WPC division is $2.83 million with 22 employees.  Energy conservation features include peak-shaving generators; treated water reuse; and interruptible gas capabilities.&nbs