case studies on membrane systems

Horsley Witten Group, Inc.

Wastewater Improvement

Projects

Massachusetts Correctional Facilities

Plymouth and Norfolk/Walpole, MA

Joe Longo

jlongo@horsleywitten.com

Tom Lee

fplee@horsleywitten.com

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

jlongo@horsleywitten.com

Tom Lee

fplee@horsleywitten.com

508-833-6600