WEF Discussion Forums : Collection Systems http://www.wef.org/OnlineEducation/page_forum.aspx?g=topics&f=544&groupid=-1 Sanitary Sewer Overflows (SSOs), Combined Sewer Overflows (CSOs) Chemical Grouting Sewer Joints & Laterals http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8589935266 Started by 01673195
Last Posted to on Wednesday, April 03, 2013 1:56:35 PM by 01673195
Looking to hear from any Utility's using grouting to control I&I. ]]> Wed, 03 Apr 2013 18:56:35 GMT Collapsed Sewer Lines http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8589935263 Started by handymanlondon
Last Posted to on Thursday, February 28, 2013 1:30:38 PM by 01667942
The most common reason for Collapsed sewer lines that i see is sloppy construction and poor choice of materials for the conditions.  If you have both thin pipe and high speed backfilling with the excavated dirt, rocks and debris you will destroy the pipe quickly.  There is also the damage from other utilities.  Directional boring, power pole anchors and grounding rods, etc. ]]> Thu, 28 Feb 2013 19:30:38 GMT Sewer Exfiltration http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8589935212 Started by 01661580
Last Posted to on Wednesday, September 05, 2012 12:45:16 PM by 01661580
Has anyone had to address any issues with sewer exfiltration? Have you heard anything from your local regulatory community on exfiltrating sewers? ]]> Wed, 05 Sep 2012 17:45:16 GMT How will our Sani/SWM services change by 2050? http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=6442451202 Started by Stephen Lampert
Last Posted to on Thursday, December 08, 2011 6:38:47 PM by Stephen Lampert

 

  

 My City Managerhas recently asked how Sani/SWM services will change by 2050. I could really use some futuristic ideas/predictions from the forum. I need to answer him by the end of day Friday, December 9. Thanks for any help on this.

Steve

  

“What will City services look like in 2050?  Specifically, how will the services your department provides change by 2050?” 

  

As specialists in your field, what trends, technologies, or service requirements do you foresee as emerging or necessary. 

  

Please reply with any ideas that you would like included by end-of-day Friday, December 9th.  Your input will likely affect future decisions on how the City is run or how this department may conduct its business. 

  

Thank you for your participation. 

  

Regards, 

  

Tom  

 

]]> Thu, 08 Dec 2011 00:38:47 GMT I&I http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8975 Started by T.O.C.
Last Posted to on Monday, December 05, 2011 12:13:26 PM by Peter McCarthy

One of our municipal customers is questioning our wastewater flow metering by showing lack of correlation with municipal water usage. The community has high water tables and, up to 5 years ago, no connection inspection program. In the past, I have not seen good correlation between municipal water usage and wastewater flows, even with tight collection systems. Does anyone know of studies or have experience in correlating these two data sources?

Pete McCarthy

]]> Mon, 05 Dec 2011 18:13:26 GMT Mercury Control - Pretreatment http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=6442451006 Started by Jason Graham
Last Posted to on Tuesday, November 29, 2011 2:07:35 PM by Jason Graham

Hi Everyone,

 

I am trying to learn more about programs used by other utilities to help control mercury from a pretreatment standpoint.  For example, does your entity have the following programs in place?

 

1)  Amalgam separator program with local dentists?  Inspection process?

2)  Programs for photo finishers to remove Hg prior to the collection system?  Inspection process?

3)  Program that investigates and identifies all potential and real sources of Hg from all non-domestic sources including schools?  Inspection process?

4)  Other programs or lessons learned?

 

Thank You!

]]> Tue, 29 Nov 2011 20:07:35 GMT Flextran fiberglass pipe http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=11547 Started by James Crooks
Last Posted to on Thursday, November 10, 2011 6:40:49 AM by James Crooks

Does anyone have experience with Flextran pipe.  We have 11,000 feet of 42 inch interceptor and I am trying to get a history of other people's experience with this product.

]]> Thu, 10 Nov 2011 12:40:49 GMT Pump & Equipment Replacement Program http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=9072 Started by Dennis Hudson
Last Posted to on Tuesday, August 23, 2011 6:23:08 PM by Dean Falkner

There are a few thoughts to consider:

 

The original Clean Water Resolving Program dictated the need for an equipment replacement program.  It's good business.  Have money built over time to replace old and aging equipment.

 

Some engineers were creative and actually built the perfect plant.  However, some equipment really represented a misapplication of equipment.  Before fixing anything, it's always good to review the performance and maintenance history to make sure it's the right equipment.  If it's not, why dump money into a looser.

 

Actually, we expanded our equipment replacement fund to also include a sewer jetter.  By doing so, we actually collect revenue toward replacement from all of the departments using it....water department, for valve box and stop box repair plus hydrant cleaning and vacuum of paint debris.....DPW for digging holes to plant trees...wastewater for sewer jetting and other applications.

 

Personally, I have a real issue always borrowing for routine and ongoing expenses.  In my current position...we have a debt service requirement of about $750,000 and our actual O&M budget is a similar amount.  Our current rates would have been 1/2 of the current rate had folks made minor rate increases instead of borrowing against our kids and grand-kids.

 

Yep...I'm an old guy....

 

Dean Falkner

 ]]> Tue, 23 Aug 2011 23:23:08 GMT Cleaning force mains http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=10786 Started by Robert Ooten
Last Posted to on Tuesday, August 23, 2011 6:13:00 PM by Dean Falkner

Hi Bob:

 

We've used a pig to help on water main problems, but not a force main.  It worked, but we needed to create a pig entry point that was easy to access the main....valves were essential.  The foam pigs provide great options.

 

A challenge I have seen is that we use VFD's to control pump cycling.  In doing so, we ignore the minimum velocities of the force main.  Perhaps at night time, it's worth allowing the wet well to build-up...then use multiple pumps to create a scouring velocity.

 

Just a few thougths.

 

Dean Falkner

 ]]> Tue, 23 Aug 2011 23:13:00 GMT Clogging Pump Impellers - Wastewater Collection System http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=10741 Started by Frederick Auermuller
Last Posted to on Tuesday, August 23, 2011 6:07:43 PM by Dean Falkner

  

Fred:
 
An idea for your hip pocket is if you can identify an alternative pump that would be able to handle this kind of flow.  For instance, we had originally spec'd Vaugn chopper pumps.  We accepted an alternative.  We raised the concern that the Vaugn would have worked.  The alternative pump manufacturer bent over backwards to get their pumps to work.
 
Another issue can actually be the pump suction.  Vaughn wanted a larger diameter suction piping than te alternate required.  The larger diameter suction eases flow and reduces NSP to get better flow.
 
Good luck and I'd love to hear your ultimate solution!!!!!!!!!!!!!
 
Dean

 

 ]]> Tue, 23 Aug 2011 23:07:43 GMT Customer Response to Sluggish Plumbing http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=10614 Started by Doug
Last Posted to on Friday, July 08, 2011 7:43:14 AM by 01834967

Our utility sends out a crew to check the sewer main and the property line cleanout if there is one available.   

 

We provide this service even after hours if the customer contacts our emergency number.

 

]]> Fri, 08 Jul 2011 12:43:14 GMT Poll Question, do your jetter ops wear hard hats? http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8221 Started by Moline Mark
Last Posted to on Friday, July 01, 2011 3:43:29 PM by 01834967
Our operators are required to have on a hard hat and traffic vest anytime they are on a jobsite. ]]> Fri, 01 Jul 2011 20:43:29 GMT Pieburting of asbestos/cement pipe http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=10607 Started by Leonard Blanchette
Last Posted to on Friday, July 01, 2011 3:41:50 PM by Leonard Blanchette

can anyone provide the current view of EPA regarding pipebursting of asbestos/cement pipe. I am aware of its 1990 (1991?) stand. Thanks.

 

Leonard Blanchette

Brunswick Sewer District

lblanchette@brunswicksewer.org

 ]]> Fri, 01 Jul 2011 20:41:50 GMT Any reported problems with plastic gravity sewer mains? http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8808 Started by Mark Orey
Last Posted to on Wednesday, June 29, 2011 6:38:47 AM by Anonymous
Fianlly! This is just what I was looking for. ]]> Wed, 29 Jun 2011 11:38:47 GMT The use of Flow Control Vavles on Sewage Force Mains http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=9958 Started by Andrew Platt
Last Posted to on Tuesday, June 28, 2011 4:46:14 AM by Anonymous
You keep it up now, unedrastnd? Really good to know. ]]> Tue, 28 Jun 2011 09:46:14 GMT Vaccum Sewers: Flovac vs Airvac http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=9865 Started by Alberto Lazaro
Last Posted to on Sunday, June 26, 2011 3:35:32 PM by Anonymous
Check that off the list of tgihns I was confused about. ]]> Sun, 26 Jun 2011 20:35:32 GMT Large EQ tanks at point-of-discharge http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=10412 Started by Robin
Last Posted to on Tuesday, June 07, 2011 7:59:45 PM by 01667942
I am aware of a prison that has an onsite EQ basin with about 18 hours of hydraulic detention time.  There are several problems.  The first is odors, they exchange the media in the exhaust air scrubber so frequently the cost is now a barrier.  The corrosion inside the covered EQ basin (CROM) will soon destroy the tank.  The tank includes a internal prop type mixer and two mixing aspirators.  The aspirator air lines were extended through the roof to allow external air to be used as an attempt to improve odors.  The recieving POTW has odor problems.  The mixers are truned off in low flow times to prevent soap suds building up and causing "high water" alarms.  There is discussion of building a new lift station and bypassing the tank unless there is need for the storage. ]]> Tue, 07 Jun 2011 00:59:45 GMT Boil Out, Deep fat fryer cleaner http://www.wef.org/OnlineEducation/page_forum.aspx?g=posts&t=8989 Started by Brett Ward
Last Posted to on Thursday, December 16, 2010 8:54:44 AM by James Royer

If they store it in a barrel I hope they have their grease trap pumped prior to discharge of the whole barrelful of solution. If not then they would probably dissolve the collected grease and emulsify it into the sewer line. At some point downstream it might solidify and cause a blockage the same as if too hot water is discharged thru the greasetrap.

]]> Thu, 16 Dec 2010 14:54:44 GMT