Streamline - Fall 2012 - (Page 15)
Craig-New Castle PSA:
BY DONNA J. LAWSON, WASTEWATER TECH II
One Small System’s Giant Leap into the Future
THE CRAIG-NEW CASTLE wastewater treatment plant is nestled in the heart of Craig County in the Virginia Western Highland region of the Alleghany Mountains. Located about 30 miles north of Salem, 60 percent of the county is national forest. It is one of the least populated counties in the state. Currently, the Craig-New Castle PSA has 495 water connections and 387 sewer connections. It is by definition a rural community. The treatment plant is comprised of an Imhoff tank (to remove solids) and three treatment ponds: raw stabilization, facultative stabilization and a finishing pond. The facility has a rated capacity of 0.175 MGD with an average flow of 0.100 MGD. The system is working on reducing I&I through sewer line repair and septic tank replacement.
Since state agencies funded part of the small facility, the design of the plant has focused on using green technology as much as possible.
About 300 connections have septic tanks which must be routinely maintained by the PSA. Very little solids enter the raw stabilization pond due to the solids removed by the Imhoff tank. Solids are removed from the Imhoff tank and pumped to drying beds. The solids are hauled to the county landfill when dried. Though the plant has very little solids accumulated in the bottom of the ponds, the facility has been under
a consent order from DEQ for high suspended solids in the effluent since the spring of 2010. The suspended solids are a direct product of natural algae growth and the overabundance of Israeli Carp. Since state agencies funded part of the small facility, the design of the plant has focused on using green technology as much as possible. The facility was designed to remove naturally occurring algae and remaining solids in the finishing pond with the use of Silver Carp. Once the plant was in operation, Silver Carp were discovered not to be available in the United States. Israeli Carp were substituted to help remove algae; however, the Israeli Carp grew much larger, spawned more offspring and kept solids in suspension by disturbing the bottom of the finishing pond. They also did little to remove the algae. Eventually the Israeli Carp had to be removed. Under the consent order, the system began looking at other options for controlling algae and reducing ammonia and nitrates to be able to meet stricter standards of the Chesapeake Bay Initiative. Donald Jones, chief operator, Craig-New Castle PSA, and Gary Crouch, PE, Anderson and Associates, worked on selecting treatment options that were easy to operate, effective and sustainable.
Table of Contents for the Digital Edition of Streamline - Fall 2012
From the President
From the Executive Director
A Day ( or Two) in the Life of a Circuit Rider
The Necessary Evolution of Water and Wasterwater Utilities
Craig-New Castle PSA: One Small System's Giant Leap into the Future
Poor planning on your part does not constitute an emergency on our part
Extra Highlights from 2012 VRWA Conference
Virginia Department of Transportation Work Zone Traffic Control Update
FOG (Fat, Oil and Grease): Sewer Public Enemy No.1
The Inspector Found What?
Ergs, Joules & Such
Understanding your Job as a Board or Council Member?
Throwing My Loop
Do You Know What Your VRWA Benefits Are?
Welcoming New Members
Board Of Directors
Index to Advertisers/Ad.com
Streamline - Fall 2012