A Unique Approach to Southgate-Wyandotte CSO Facility ... Sullivan - CSO...2016/01/29 · 1998...

A Unique Approach

to Southgate-Wyandotte

CSO Facility Renovations

Timothy Sullivan, Senior Associate

Hubbell, Roth & Clark, Inc.

2016 WWADCON, FRANKENMUTH

Click to edit Master title style

2016 WW Admin Conference 2016 WWAdmin Conference

History of the Southgate-Wyandotte District and Facilities

RTF Facilities and Operations

Statement of the Problem

Alternatives

Solution

Green Project Reserves

Unique Features

Lessons Learned

Presentation Summary

| 1/29/2016


2016 WW Admin Conference

SE Michigan, Wayne County, City of Wyandotte, Ecorse Township, now Southgate

Adjacent to the Downriver WWTF (DWTF)

Serves all of Wyandotte, Half of Southgate

Mostly Combined Sewers, some storm sewered areas

History of the District

and Facilities

| 1/29/2016




and Facilities

| 1/29/2016



All Local sewers constructed flowing east towards Canada

1929 Sewer system and Pump Station No. 5

Interceptor System (11 ft. and 9 ft. Dia.)

PS No. 5 - 900 MGD Capacity

Course screen, no disinfection

Inner Ring - Dry Weather pumps

Outer Ring - Wet Weather Pumps

13 ft. x 15 ft. box to Detroit River


and Facilities

| 1/29/2016




and Facilities

| 1/29/2016



1938 DWTF Constructed next door

30 MGD, Primary Treatment and Disinfection

PS No. 5 dry weather flow to DWTF (20 MGD)

Wet weather flow to same place

Further DWTF Expansions (30 MGD to 100 MGD to 150 MGD to 225 MGD)

But no increase in 20 MGD purchase capacity


and Facilities

| 1/29/2016



1970’s S-W Relief System

Relief Sewer System (3 main branches, Major overflow connections, 13 ft dia. to PSPS)

1,700 MGD Pine Street Pump Station (staffed)

15 MG Retention Treatment Facility (RTF)

Flow Control Chamber and Gate (< 20 MGD to DWTF)

10 yr., 1 hr. storm (1.82 inches/one hr.) (Pre TP-40)


and Facilities

| 1/29/2016




and Facilities

| 1/29/2016

• Show 1970 stuff



Hydraulic Capacity

Flow Control Chamber - 20 MGD to DWTF (full treatment)

Btw 20 and up to 550 MGD to CSO Basin (screenings, scum and disinfection)

Btw 550 MGD and 900 MGD directly to Detroit River (screenings and disinfection)

Up to 1700 MGD to Detroit River

at Pine Street PS

2,600 MGD Total

RTF Facilities and Operations Hydraulic Capacity

| 1/29/2016



Sodium Hypochlorite Disinfection

Twin underground concrete 5,000 gal tanks

Excellent shelf-life

No dilution required

Inspected in 2006

after 30 years of use

RTF Facilities and Operations RTF Disinfection

| 1/29/2016



Sodium Hypochlorite Disinfection

Chemical feed pumps:

Pumps to constant

head tank

One chem. feed pipe

for each storm pump

Overflow returned

to storage tank(s)

RTF Facilities and Operations RTF Disinfection

| 1/29/2016



No chemical pre-mixing, tanks mixed during operation

Supercharge First Flush (Fecal limit, no Chlorine limit)

Then one storm pump –

one chemical feed pipe

ALL flow supercharged

then disinfected

Often Full Capture of events

(no-overflow)

Manual implementation of basin flushing (drum controller to pneumatic flushing valves)

RTF Facilities and Operations RTF Operation (Pre-2000)

| 1/29/2016



15 MG Basin

Twin 7.5 MG basins

7 Bays each tank

Both operated together (in Parallel)

Inlet Isolation gates

RTF Facilities and Operations RTF Basins

| 1/29/2016




| 1/29/2016

• Add plan of basins



Flushing System

Strainers, Booster Pumps

Flushing header


| 1/29/2016

Orifice type nozzles




and Facilities

| 1/29/2016




| 1/29/2016



1998 NPDES Permit - Optimization Study

Interim (1999) and Final (2003) CSO Control Program

Operations Plan

Sequenced vs. Parallel Operation (rejected)

Surface Overflow Rate Limitations (accepted, not implemented)

Automation Study

Cost Effective to Automate

7-10 Yr. Payback, depending on “savings”

RTF Facilities and Operations Prior Studies

| 1/29/2016



Aging Facilities

Manual Operation (Staffing issues)

Inefficient Chemical Feed

Ineffective Flushing System performance

No Money

Statement of the Problem

| 1/29/2016



Complete Facility Renovations

Full Automation

Process Optimization

Flushing System Improvements

Look for Money

Improvements Required

| 1/29/2016



Revisit Sequenced Operation Fill one tank, then disinfect / settle with second tank

Required new flap gates, new actuators on isolation gates

Significantly lowers chemical use, but

Limits hydraulic throughput and contract time

Alternatives Process Optimization

| 1/29/2016



Four Categories Green Infrastructure, Water Efficiency, Energy Efficiency and

Environmentally Innovative

Environmentally Innovative Category Projects that significantly reduce chemical use

Sodium Hypochlorite is a chemical

Hmmmm…..

Bang-up Business case was prepared,

and upon further review…


| 1/29/2016



Awarded $1,100,000 Principal Forgiveness!!!

And the Wild Rumpus Began……


| 1/29/2016




| 1/29/2016



Sequenced and Parallel Operations

Chemical Mixing System

Flushing System Corrections / Enhancements

Automation and Chemical

Management

Unique Features

| 1/29/2016



Sequenced and Parallel Operations

Show plan with flap gates

Unique Features

| 1/29/2016



Unique Features

| 1/29/2016



Flash Mixing equipment

Wet Well Installation

Access (Class 1, Division 1 Atmosphere)

Equipment Protection

First (and only) Dry

Well installation in MI

Unique Features Chemical Mixing and Operation

| 1/29/2016



Wet Well Configuration and Operation

Annular ring and flow

Short-circuiting of Flow - Chemical

Mixers need to pair with Pumps


| 1/29/2016



Wet Well Configuration and Operation

Preferential Mix and All Mix


| 1/29/2016



Pre-storm Automatic tank mixing

Single or Dual tank supply

Automatic Tank Transfer

Manual Tank Transfer

Feed Control Include Percent

Chlorine for each tank

Automatic System Flushing

Unique Features Chemical Management

| 1/29/2016



Effluent Water Source

Two SP Kinney Strainers

Three Booster Pumps

Unique Features Existing Basin Flushing System

| 1/29/2016



Header System with nozzles directing downward

Adequate water supply but ineffective nozzle energy

Unique Features Existing Basin Flushing System

| 1/29/2016



Minimize Cost

Rebuild Ex Strainers, Pumps

Maintain Header System

Maintain but Re-direct Nozzle energy

Eliminate Dead Zones

Add Nozzles “Effectively”

Unique Features Flushing System Goals

| 1/29/2016



Redirect Energy with:

Curved Contour concrete?

Quartered Pipe?

Rotate Pipe and Nozzles?

Pre-cast concrete “curbs”

Unique Features Existing Nozzle Options

| 1/29/2016



Shoot Along Floor?

Spray Out onto Floor?

Trial Process During Construction

Unique Features New Nozzle Options

| 1/29/2016



Unique Features New Nozzle Options

| 1/29/2016



One Tank at a time

Two-pass System

First pass: first to last Bay

Second Pass: Last to first bay

Adjustable time

Manual bay control

Unique Features Flushing Sequence

| 1/29/2016



Slide Gate Improvements

Stem Not True

Stem Threading – Acme vs Modified Acme threading

Stem Wear

Lessons Learned

| 1/29/2016



Nozzle Trial and Error

Curb Trial and Error

Lessons Learned

| 1/29/2016

THANK YOU

Questions

Timothy Sullivan, Senior Associate Hubbell, Roth & Clark, Inc.

535 Griswold, Suite 1680 Detroit, Michigan 48226




and Facilities

| 1/29/2016

A Unique Approach to Southgate-Wyandotte CSO Facility ... Sullivan - CSO...2016/01/29 · 1998...

Documents

Transcript of A Unique Approach to Southgate-Wyandotte CSO Facility ... Sullivan - CSO...2016/01/29 · 1998...