Ferric Chloride has the unique ability of ruining everything it touches. My mind runs to an external pipe solution such as an ultrasonic meter.  I like Endress Hauser for that sort of thing but there are plenty of good ones on the market.  

Regards, 

Pat Frano

Blue Sphere Water Technology

I am working the sale of an ozone system to replace chlorine/dechlor chemistry for a small sanitary treatment plant on an NPDES permit.  Am wondering if anyone knows of a facility in North Carolina that has done a similar project using ozone for Fecal Coliform reduction?  Would like to reference their permit number as an existing case to speed our modification to my clients permit through DEQ. Thanks for any help you can provide. 

We are interested in learning of methods used by agencies to assess ocean outfalls.  Of particular interest is internal inspection, structural assessment and the estimation of remaining service life.  Our outfall of concern ranges from 48-inch to 72-inch in diameter, extends 8,700 feet into the Pacific Ocean, to a depth of 160 feet. Outfall age is roughly 50 years. External assessments are completed regularly with divers (in shallow depths) and ROVs (deeper). There is a group of agencies in California that would like to learn from the experiences in other parts of the country and beyond.

We're having problems with nitrification in an enclosed HPOX aeration unit with surface aerators. The pH is probably borderline at 6.2-6.3. It is probably depressed by CO2 buildup in the headspace of the UNOX. My research indicates we would get minimal nitrification at that pH.

I'd like to know what normal pH is in mixed liquor from other types of aeration processes. Please tell me your pH and type of aeration.

Thanks

Our NPDES permit requires that we continuously monitor the flow rate of our treatment plant's influent and effluent wastestreams.   The NPDES standard conditions states that we need to calibrate our meters every six months or more often if required by the manufacturer.  Do anyone of you have similar provisions in your permits and if so, how do you folks address them. I've heard some facilities have redundant flow meters so technically they are always monitoring the folow. If you don't have redundant meters, do you notify your regulatory agencies when the meters are taking offline to conduct the calibration?  how is the situation handled? 

Aloha.

In Hawaii, we have an NPDES Permit Standard Condition issued by our State Department of Health that requires periodic calibration (6 months interval or more if required by the manufacturer).  Our NPDES permit requires the monitoring of the treatment plant's influent and effluent flow continuously.  

During a recent calibration event, it took the techs longer to perform the work than usual.  Do you folks have a similar language in your permit that requires continuous flow monitoring and if so, how do you folks handle the situation when a calibration is performed. Do you folks submit a notice to the regulatory agency when an interruption is performed for the calibration and if its longer than usual do you folks submit a noncompliance?  Do you folks have redundant flow meter to meet the continuous flow provision of your permit?

Hello All,

I am a student and in my project I need to be able to estimate size (at list area) of the primary settlement tank of which I know the flow rate per day (around 330 ML/d), and the actual retention time is less than 20 min. I am not an engineer (I study environmental management with chemistry background), and wonder if I could find any relationship between the flow rate and tank size if the retention time of 2 h is desired.

Thank you very much in advance,

Hajar 

 The City of Kuna, Idaho hereby announces that sealed proposals will be received for the PURCHASE, LEASE, MANAGEMENT, OPERATION AND/OR OTHER MUTUALLY AGREEABLE TRANSACTION involving the 3.5 million gallon per day Kuna North Waste Water Treatment Plant.   

Proposals will be received until 4:00 pm on October 2, 2012, Mountain Daylight Time. Proposals received after the due date and time will not be considered and no proposer may withdraw their proposal after the time set for the opening. 

Specifications and instructions for submission of proposals are available as of August 29, 2012 at http://www.dpfg.com/kuna/  or by email from Matthew Look at matthew.look@dpfg.com or contact directly at 602-381-3226 ext. 15.  Copies of the Request for Proposals may also be obtained from the Kuna City Clerk located at 763 West Avalon, Kuna, Idaho. 

The Kuna City Council reserves the right to disregard all non-conforming, non-responsive or conditional proposals, to waive any minor informality, to reject all proposals or to accept the proposal it deems best. 

I am starting up an Orenco unit at a small ski resort. Thinking of feeding the system ahead of time to get the bugs going prior to January. Any suggestions.

I also have to deal with cold process temps.

complicated and costly. If you have a good I.T. guy to keep all the bell and whistles going it has the potential of working well.

Charlie,

Are you speaking of the wires in the conduit supplying voltage to the UV system from the control panel?  Have you taken and amp reading under load and verified the wire gauge is correct for the voltage?    

Hi,

Typically when I have seen supersaturated DO readings in a facultative lagoon it has been during times of low rainfall and high temperatures.  What you are probably seeing is lagoon turnover.  I can't remember the exact process but it is due to the carbon dioxide being stripped off the upper layer of water.  I would assume they took the DO reading sometime around midday.  Another way to test this is to check the pH when you get a high DO reading.  If the pH is also high this is a typical sign of turnover.  Also this is a natural occurance.  The only thing I know is to change the time of sample collection to early morning to late evening.

We operate a collection system and wwtp on a island and are concerned about the salt water intrusion. We would like to know, perforable with out actually experiencing it, at what level of salinity is too much and will affect our effluent water quality. We have a few properties on the beach that are suspect of saltwater intrusion at high tide. As beach erosion creeps inland, other properties become suspects as well. So at what ppt salinity do we set as the cut off?

Greg  

Hi guys, just arrived.

 
I would like to hear about your feedback and how I can improve it.

 
My Blog: <a href="http://www.wastewatersystem.net/">Wastewater Design and Technology</a>

I manage a large treatment plant in Virginia Beach VA.  This plant has a large service area, very concentrated household and resaurant/hotel waste, and a very long travel time up to 3 days to get to the plant.  All flow is conveyed via force mains.  From Mid April through November we have a problem with very thick floating sceptic greasey scum in our primary clarifiers; that if not continuously manually skimmed, will cover the clarifier and completely overwhelm the scum collection system and cause the solids collection flights/chain to jump its guide sprockets and derail in the clarifier.

I am trying to contact other plants that might have this same problem and hopefully learn a few successful ways to either prevent this from happening or actually remove the greasey scum automatically without a lot of manual labor.

Erwin E. Bonatz Jr. P.E.

HRSD Atlantic Treatment Plant Manager

757 821 7402

Hi,

I'm looking for specific measurements and/or statistics about how much energy pumps generate. Hoping someone here can help!

I know that 20 percent of the world's energy is generated from pumps that heat, cool, or move water. What I want to know is what is the measurement of the total energy that this 20 percent comes from? What unit of measurement do I use to analyze this?

Thank you for your help!

I'm looking for some specific measurements / statics about how much energy pumps generate. Can anyone help?

I know that 20 percent of the world's energy is generated from pumps that heat, cool, and move water. I'm trying to understand what is the measurement (in units) of the total energy that this 20 percent comes from? What sort of units do I use to measure this?

Thanks for your help!

Does anyone know of an affordable trash removal system for getting all the trash out of land applied liquid biosoilds?  I already know about the Muffin Monster, but that is an expensive piece of equipment for a ranch to use.  Any help is appreciated.

You could have seperate pumps etc but it is common practice to bring it the two together with only one set of pumps.

I am sure at times some inbalance exists but it generally works out okay.

regards

TerryF

Hi All,

I'm interested in some feedback on whether anyone recommends any dam odour specialists (Australia only please) or mechanisms for reducing odour associated with large evaporation dams. Additionally if you have had similar experiences below and can provide feedback on whether you found a practical solution please comment.

By it's nature the dam is used for evaporating water, and given the waters high hydrocarbon concentrations it naturally volatilises some of these compounds leading to a distinctive odour and hence nuisances to people external to the operations. We have introduced a number of methods to reduce the hydrocarbon loading, some of which exploit simple weirs and cyclones, periodic skimming of the dams to remove lighter fractions accumulating on the surface. In addition to this we treat the water thru a wastewater treatment plant to reduce overall organic loading.

There is definitely an improvement in water quality however an odour is still present (and I know always will be), but I'm interested in whether anyone has any recommendations from past experiences or can recommend a specialist who is familiar with managing odours from organic dams.

thanks

I was an industrial waste engineer for City of Toronto. We did a joint study on dental practices with Environment Canada. There are 2000 dentists in the City. We amended the City by-law to demand that all dentists install and maintain amalgam traps. The month after the deadline was imposed there was 40-80% reduction in influent mercury at 4 Toronto STPs. The remainder is probably legacy mercury from dental and other uses sitting in sewers - with specific gravity of 11-12 it doesn't like to move in sewer systems. Piles of amalgam can be seen in dental plumbing systems if no amalgam trap is in place.

Plumbing and maintenance of the traps are key issues; You just can't buy a trap and install it willy-nilly or fail to maintain it.

In my opinion 90%+ of all mercury entering an STP may be from dentists.

Hi Mack:

Just a word of caution. Magnesium is the limiting nutrient in the formation of struvite.

Strantrol 690 with HRR excellent make sure you have self clean otherwise you have to lift the probe and do it manually. Saves alot in Cl2 depending on the amount used presently, great for checking how well your Oxidizing in the Aeration Tank. Set point 450 mv.

We are taking CCTV route to inspect the extent of phosphate scaling in digester piping. The piping is insulated. Any experiences/suggestions with CCTV inspection for pressure piping or alternative inspection methods will be helpful.

Thanks.

We are going CCTV route to inspect extent of phosphate scaling in digester piping. The piping is insulated. Any experiences/suggestions with CCTV inspection for pressure piping or alternative inspection methods will be helpful.

Thanks.

If you replace 10, 18, or 25 links on one side of the chain, then you need to replace exactly the same number on the opposite side in exactly the same location on both sides.

Chain stretches whether plastic or metal and if you don’t replace chain exactly in the same spot on both sides at the same time, you will have derailing problems.

Moving water has a harder time freezing, floating mech aerators, etc, anything that might keep the water moving should help.

Have small plant, 4,000 gpd that receives wastewater from a McDonald's and a truck stop.  Continue to see upsets which can result in high effluent TSS levels.  It is a It seems to be related to something they are using either in the McDoanlds or the truck stop.  Anyone had any experience with troclosene toxicity or toxicity from cleaners/sanitizers used at a restaurant?