Download - Case Studies on Membrane Systems
Horsley Witten Group, Inc.
Wastewater Improvement
Projects
Massachusetts Correctional Facilities
Plymouth and Norfolk/Walpole, MA
Joe Longo
Tom Lee
508-833-6600
Horsley Witten Group, Inc.
MCI Plymouth
Horsley Witten Group, Inc.
MCI Plymouth
• Existing Title 5 System
– Serving 200 Inmates, 15 staff = 13,825 GPD
– Failed Inspection in Sept 2007
• Need - Expanding Population
– Design System to Serve 300 inmates, 21 staff for
31,000 GPD (**100 GPD/Inmate**)
• Reason for MBR - Campus is located
within several Drinking Water Zone IIs
– Effluent Quality to Meet DEP’s Interim
Guidelines on Reclaimed Water
Horsley Witten Group, Inc.
Permits (Plymouth)
• Groundwater Discharge Permit
– Engineering / Hydrogeologic Reports
• MEPA-ENF: >10,000 GPD in Zone II
• MESA- Priority Habitat (8 moths and box
turtle)
• New Source Approval (new water supply
well)
• NOI – less than 100’ of Bumps Pond (well)
Horsley Witten Group, Inc.
Existing Influent (Plymouth)
• Daily Flow – 13,000+ GPD
– 200 inmates
– 15 staff
• BOD – 358* mg/L (120 current longer term
influent data)
• TSS – 210 mg/L
• TKN - 124 mg/L
• Alkalinity 163 mg/L
*24 hour sample during design
Horsley Witten Group, Inc.
Design Effluent* (Plymouth)
• Daily Flow – 31,000 GPD
– 300 inmates
– 21 staff
• BOD <30 mg/L
• TSS – 10 mg/L
• Total Nitrogen <10 mg/L
*Based on DEP Interim Guidelines on Reclaimed Water (BRP/DWM/PeP/P00-3)
Horsley Witten Group, Inc.
Evaluate Alternatives (Plymouth)
• Evaluated treatment alternatives:
– Membrane Bioreactor (MBR)
• $2.0 Million *
– Sequencing Batch Reactors (SBR)
• $2.6 Million
– Rotating Biological Contactors (RBC)
• $2.9 Million
*DCAM Accepted Low Bid – Prevailing Wage
Horsley Witten Group, Inc.
MBR Pros/Cons (Plymouth)
Influent fromLift Station
Two 10,000 gal. EQ Tanks
WWTP 1,200 s.f.(31,000 GPD)
Dosing Tank10,000 gal.
Leaching Beds
Primary Settling/Trash Rack
Influent
Primary Settling/Trash Tank10,000 gal.
EQ 10,000 gal.
EQ 10,000 gal.
Anoxic/Mixing
Aeration-Kaiser
Blowers
Membrane
Permeate Pump
Quick Connect for Wasting
RAS
Dosing Tank10,000 gal. Effluent
To Disposal
Field
UVPost Anoxic
Zone/Carbon
Horsley Witten Group, Inc.
Operation and Results (Plymouth)
• Clear Water Test and Start-Up
March/April 2010
• Mixed Liquor Conc 8,000 mg/L
• Wasting – 3,000 gal/month
• MBR Cleaning In Place (CIP)
– 5% NaOCl Solution
– Twice Since Startup
Horsley Witten Group, Inc.
Operation and Results (Plymouth)
GOOD RESULTS!!
• TSS 0.1 – 0.2 mg/L (<10)
• BOD 0.5 – 3.0 mg/L (<30)
• Total Nitrogen 3.5 – 8 mg/L (<10)
• Still optimizing plant operation
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
MCI-Norfolk
• Existing 0.486MGD WWTP with Sanitaire
Package Treatment Units (PTUs) to Sand
Filter Beds then surface water discharge
• Interruption of Service Not Option
• Upgrade Required to meet new NPDES
Discharge Permit (discharge by 12/2012)
– BOD 7 mg/L
– Total Ammonia Nitrogen 1 mg/L
– Total Phosphorus 0.1 mg/L (April - Oct)
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Getting Started (Norfolk)
• HW hired by DCAM – March 2009
• DEP Approved design – November 13, 2009
• Bid Date – December 2009
• Start Construction – February 2010
• Start-up – March 2011
Horsley Witten Group, Inc.
Existing Influent (Norfolk)
• Ave Daily Flow – 0.486 MGD
– 3,000 inmates
– 1,400 staff
• BOD – 350 mg/L
• TSS – 347 mg/L
• Total P – 4.1 mg/L
• TKN – 31 mg/L
Horsley Witten Group, Inc.
Evaluate Technologies/Cost (Norfolk)
• MBR Selected based on recent success at
Plymouth, and flexibility of installing MBR
without Interruption of Facility Operation
• Membrane - $7.7Million (DCAM accepted
contractor low bid)- *Includes Conversion of EQ
tanks, Headworks, UV, etc.
HeadworksCoarse/Fine Screen
Existing Office/Lab
Existing EQ Tanks(75,000 gal. each)
Effluent to UV
New WWTP (10,000 s.f)
0.5 MGD
Sludge Wasting Tanks
Distribution Box
Convert to AnerobicTank (200,000 gal.)
Convert PTU’s to EQ (400,000 gal. total)
UV
Train 1 Train 2
Influent
Anoxic Tank, Mixing &Carbon Addition
Aeration
Kaiser Blowers
Membrane
Permeate Pumps(Under Vacuum)
Effluent to UV Sludge Wasting
RAS RAS
To Anerobic TankTo Anerobic Tank
Horsley Witten Group, Inc.
From “Sticks n Bricks” to the Real Thing
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Horsley Witten Group, Inc.
Questions
• Anyone interested in touring either
facility let us know.
Joe Longo
Tom Lee
508-833-6600