Effluent Pump to Septic Tank First 1

[cap4000]

Has anyone ever designed a low dynamic head say 7 to 9 feet and flowing 80 GPM, 0.25HP pump with 2 inch pvc pipe to a septic tank first then to a 8 pipe D Box. Is a 90 degree elbow reqiured at the D Box inlet to assure uniform flow to the leach field after coming out of a 1000 Gallon Tank?? These are the tank disposal requirements of the town.The layout is first a 1500 Gallon-2 Compartment Tank then a 1000 Gallon Pump Tank then to a 1000 Gallon Septic Tank and finally to the D Box. Any responses will be greatly appreciated.

 

[TerraSouth]

Your terminology is different from what I'm used to.

First, I've never heard of pumping 80 gpm to a D box. That's alot of water, as most D boxes only permit a max flow of around 30 gpm. For your system I would look at dosing your effluent field 4 to 12 times a day with a timer, this also depends alot on local health department requirements.

Typically your "septic" tank is first in line, as it captures and retains solids. After your septic tank then you have secondary treatment tanks and/or a pump tank.

If your pumping to a D-Box, check out Zoellers "Tru-Flow" distribution box. It is by far the best Distribution box on the market.

I'd look at a pump that pumps around 15 to 25 gpm at the head you require. Use Hazen Williams to determine your head loss, and if need be put a globe valve in line in order to get your head requirments up.

Hope this helps

 

[cap4000]

TerraSouth

This was the layout the Board of Health Inspector required.
I am a PE, but my plans would not have been approved if I didn't do exactly what the Inspector required. Finally, I do have 3 flow control alarms by Zoeller. The job is already done and pumping. Thanks.

 

[TerraSouth]

cap4000

Good to hear your job is up an running!

Health Departments can be a pain sometimes..

 

[francesca]

We just completed the fifth phase of a subdivision on a STEP/STEG system. I'm not sure how this relates as you appear to be pumping to the septic tank, not from it, but the pumps we used were low head/low flow. The system is run by Tennessee Wastewater Systems Inc. and the pumps provided by Orenco Systems. They sent me their design manual and software, which may help you some if this should come up in the future.

 

[TerraSouth]

Francesca,

I'm know the parties you are talking about. I meet the guys with Tennessee Wastewater Systems at a local trade show back in July. The Pickney Bothers own and run that company. They are big into decentalized wastewater and seem to be doing very good with it in Tennessee.

Did you use a recirculating sand filter then then use Netafilm drip tubing for dissposal? That is most of what the Pickney Brothers do.

I'm about to design a STEP systems myself. But I'm not using Orenco or recirculating sand filters. I have a partner and we are about to form an On-Site Wastewater Management Company. I've taken alot of time to study On-Site and hope to take the PCS (Professional Soil Classifiers) exam next year, as soils is the driving force in On-Site disposal.

Good stuff!

 

[francesca]

Actually this particular subdivision collects the effluent in a central pump station and pumps the effluent into the City system. There was talk of disposing of it on site as there's plenty of good soil, and the city would love to get the effluent out of their system, but they haven't done that. We're not at all involved with the running of the system so we're out of the loop.