STEP sewer system
STEP sewer system
(OP)
Could anyone point me in a direction of some good info on the subject systems. I figured I'd see what I can learn before asking specific questions.
Thanks.
Thanks.
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RE: STEP sewer system
good luck
RE: STEP sewer system
RE: STEP sewer system
Have a look at
http://www
for a 65 page (chapter 2) doc of pressure systems.
Very good set of refs at the back.
Also do an internal search (of the EPA USA web site) for : - EPA62519104.
EPA - the organisation
625 - research I think
91 - year of publication
04 - fourth pub for that year.
This is a 220 page pub titled Alternative Wastewater Collection Systems.
That lot of reading should do you for the next week or two.
BarryEng
RE: STEP sewer system
Here is the link
http://ne
=EPA&Index=2000%20Thru%202005%7C2006%20Thru%202010%7CPrior%20to%201976%7C19
76%20Thru%201980%7C1981%20Thru%201985%7C1986%20Thru%201990%7C1991%20Thru%20
1994%7C1995%20Thru%201999%7CHardcopy%20Publications%7COnline%20Publications
&Docs=&Query=Septic%20tank%20effluent%20pumping&Time=&EndTime=&SearchMetho
d=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDa
y=&UseQField=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=%5C%5CNEPIS%5FLIB
2%5CD%5CZYFILES%5CINDEX%20DATA%5C91THRU94%5CTXT%5C00000002%5C300046DW.txt&
User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=15&Fuz
zyDegree=0&ImageQuality=r85g16/r85g16/x150y150g16/i500&Display=hpfr&DefSee
kPage=x&SearchBack=ZyActionE&Back=ZyActionS&BackDesc=Results%20page
Sorry about the length, but it works for me.
BarryEng
RE: STEP sewer system
I have not read that first document in its entirety yet, but having designed STEP systems for several years, I can attest that it looks very useful and thorough. From what publication is that chapter taken?
While we are on the subject (and if anyone thinks this should be discussed in its own thread let me know)... The matter of design flows.
From Barry's doc:
I always have a struggle here in MI regarding the basis of desgin during the permitting process for STEP collection systems and the associated treatment works for small communities (10-250 homes). They require us to use 100 gpcd (300 gpd/unit). This does not cause a big change in the design of the collection system, but it results in many other problems. The treatment system if often significantly larger than it needs to be; or the client is limited to the number of lots they might have by site constraints; or the client has stipulations placed in their permit that they may only build so many homes until they have proven the less conservative basis of design.
Multiple sources recommend design flows rates of 50-70 gpcd with actual flow rates of 40-60 gpcd. All of the data I have seen that those numbers are based on were collected before 1994 before EPACT mandated low-flow fixtures in new construction.
I think that some lifestyle changes may have possibly offset the savings of the low-flow fixtures. In the systems we monitor, 40-60 gpcd is typically what we see. Even with some infiltration.
If anyone has any current studies on the basis of design for STEP systems please share. I am seeking as much information as possible (studies, publications etc). Arrows in the quiver if you will.
And on a related note to the original question. One of the works cited in BarryEng's doc was Design and Use of Pressure Sewer Systems by David Thrasher.
http://www
I used the "search inside" feature to read a chapter of it and it looks to be a useful reference. I've got a copy being transfered from a distant library and I'll share my thoughts on it when I've had a chance to peruse it.,
RE: STEP sewer system
Never mind my question regarding the source of the PDF you posted. I see it is from the second document you have shared.
RE: STEP sewer system
I'll bet that the link that I submitted above has got to be the longest that has been posted on the eng-tips web site. A search of that site (EPA USA), will result in the most amazing quantity of reports, manuals of practice, design systems, etc that has has ever been posted on the web in the field of 'environmental subjects.'
Have a look at the complete list of pubs on the EPA USA web site. Look in the 625 area for your subject. Of interest to me was the 'onsite treatment & disposal of wastewater' (I think that is the title - septic tanks originally but now expanded to cover SBR's etc etc.). The original doc was in the early 80's but has been updated to 2004 I think. This has got to be one of the most comprehensive texts of this subject.
Only one better reference was a book that I have on 'septic tank practices' that is a gold mine of info (& compulsory reading) if you are arguing a case for the use of other alternatives to the 'big sewer'. You must remember that 25% of USA is served with septic tanks for wastewater. So if centralised wastewater is the only answer for waste water treatment, 25% of the population of the USA would have to move off shore.
I still have the earlier edition because it has a selection criteria of effluent disposal which is excellent. In it you look at the site slope, soil conditions, soil types, proximity to bedrock, proximity to ground water etc etc. It has a matrix of results such as leach drain, french drain, mound system, etc etc.
By the way, I am a water engineer in the field of water retaining structures & pipelines. Wastewater is only a passing interest to me because that is what I originally designed when I first qualified (a hundred years ago).
BarryEng
RE: STEP sewer system
Just to clarify in case anyone else is looking for it, the document number is actually "625191024" as listed in the link above.
The search page is:
h
Thanks again.
RE: STEP sewer system
Yes, please do start a new thread .
RE: STEP sewer system
More haste, less speed.
As "jthompson" said in his info above, the correct number is 625191024. Going back to my first reference, 024 appears in the email reference address, but I did not copy it correctly in the next para. The 024 means the 24th pub in that year (91) in the area of 625.
The figure 1 following 625, is the research area (I think), followed by the year of pub - 91.
Several years ago, the reference would have been EPA 625R/91-024, & I suppose it changed to the present format to aid searches using the numerals only.
BarryEng