I agree with bimr on his statements and if your DO levels are up, the diffusers are doing their job. During transition from surface aeration to diffused, I would expect to see what you are describing.
Most likely your surface aerators were not reaching the bottom of the lagoon and only...
Pedarrin2,
While I agree with your scenario, we are talking apples to oranges. In a stadium like you are discussing, the users are there for a few hours, there is a higher popluation per fixture, and during breaks, there will be times that almost all of the fixture units are flowing.
In a...
USDA (as well as Missouri) has an equation that is commonly used for sizing a distribution line. It is 9 * x^0.515 = Q. Based on an x (connections) of 50 you get a peak flow of 68 gpm. This equation takes into account that low numbers of connections use a higher flow per connection; but, also...
On a lot of past projects where we've replaced mains no temporary was installed.
Instead the new mains were installed for the area (sometimes a complete community) connected to the distribution system, and tested. This meant that at some point there were two live distribution systems. The...
What kind of blowers do you have? Are your air filters clean? Centrifugals can see a large decrease in SCFM with a dirty filter. And washing them or blowing them out with compressed air may not clean them enough to get your rated capacity.
Has your waste stream changed? Is someone dumping...
Your pump doesn't have to match the 5 gpm at 109 ft specifically. If your flow rate is higher, it will create a larger vacuum through the venturi which will be better for the pull of chlorine gas.
They should also have various sized ejectors (venturis) for various flows and pressures. The...
Been down this road before when pumping into a sedimentation tank from a well. Some of the problem may come from the air release valve. Is there a possibility that it is actually and air/vacuum valve? That would allow air to reenter the line upon shutdown allowing the check valve to hammer as...
The injection point of the sodium hypochlorite will scale and plug. Just a matter of how soon/often. Doesn't matter what material it is.
We always call out for a retractable injection quill to be installed. It too will scale; but, a spare quill can be purchased and every so often swapped...
Does anyone have any experience with electrocoagulation for wastewater treatment? Primarily in a municipal setting; but, general experience is helpful too?
I know it is used primarily in industrial wastewater for metals removal; but, my concern is its effectiveness at removing nutrients (N &...
I'm assuming that the transmitter is a transducer and not a switch.
Either way, you need to make sure that if the transducer is on the top of the pipe, there is a side blowoff to flush the line to the transducer. Probably need to with a switch also; but, I haven't seen problems with them.
A...
Another question would be what kind of pipe are you using. You might consider directional boring HDPE or yellowmine pipe for your gradual grade you discussed.
If PVC and you do use fitings; restraints are important. Not only on the fittings; but, also on the carrier pipe within your casing...
As BIMR mentioned, this is starting to go way overboard. KISS method.
First, I wouldn't really be concerned with pressure. The concern is flow. You don't want the backwash rate higher than recommended for the type of underdrain and media installed. The pressure will reduce accordingly.
On...
The filter will not remove soluble iron from the water. You will have to get it out of solution so that the filter can remove those particles. Oxidation is typically performed with aeration, chlorination, permanganate, or a combination.
You really need your water analysis before you can do...
There are several lagoons utilizing UV for disinfection. The main concern is the TSS levels (clarity) in the water. The higher the level, the more bulbs needed.
This must be an aerated lagoon to keep the TSS below 45 or you have some sort of filter before discharge.
Because of the higher...
Saf-T-Flo manufactures quill assemblies of various sizes and materials. I've had good luck with their product and mainly used a pvc or cpvc tube (depending on the chemical). Always double check the chemical compatibility.
Most of what I have used has been a saddle type installation with the...
Thanks guys, I did find the HFlume by Tracom.
My intended use is screened wastewater. One flume on a 24" DIP discharging into an orbil and one on an 18" DIP discharging into a solids contact unit. Flows ranging up to 6 MGD.
The H-Flume will take some support; however, it is still shorter and...
Another good source is from Kansas City. They have worked to promote LID on an individual basis for several years now. Do a google on "1000 raingardens". They have a lot of plant and design info available as well.
I'll tend to disagree with CVG and Bimr on the minimum size here too. It all depends upon the system.
Rural areas will tend to have more 2" & 4" pipe. Not adequate at all for fire protection; but, for domestic use it can be adequate.
In rural county water districts the pipe should be sized...
I don't have a copy so was wondering if anybody knew if or where an on-line copy of WEF's
Nutrient Control, Manual of Practice FD-7 Facilities Design
can be located?
