SuSanA - Forum Kunena Site Syndication http://forum.susana.org/ Sun, 04 Dec 2016 06:03:43 +0000 Kunena 1.6 http://forum.susana.org/components/com_kunena/template/default/images/icons/rss.png SuSanA - Forum http://forum.susana.org/ en-gb Research update and next steps (four phases of design and testing for the modified Gulper in Mzuzu, Malawi) - by: willychipeta http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19648-research-update-and-next-steps-four-phases-of-design-and-testing-for-the-modified-gulper-in-mzuzu-malawi#19648 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19648-research-update-and-next-steps-four-phases-of-design-and-testing-for-the-modified-gulper-in-mzuzu-malawi#19648
We have wrapped up four phases of design and testing for the modified Gulper here in Mzuzu, Malawi. Major findings included that it was difficult to make it low cost as our targets, and still be able to pump sludge with a high volume of trash. I am currently wrapping up the MSc in Sanitation Degree at Mzuzu University.

The intellectual property developed under the project and any possible revenue distribution is covered under the Water Research Commission policy of our project.

We are working on a publication outlining our design and testing approach. We will post is on the forum when it is available. If you are interested in continuing work on the low cost pit latrine emptying technology, please drop us a note offline.

Warm regards,

Willy Chipeta.]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 25 Nov 2016 12:10:14 +0000
Re: Vacuum truck, vacuum tanker - what is it? Simple definition for lay people? - by: awhitesell http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19621 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19621
I think the description shouldn't be limited to fecal sludge pumping. The trucks are used for a variety of industrial application.

The pump capability (height and distance limits) would certainly be good information to include.

Cheers,

Andrew]]>
Faecal sludge transport (including emptying of pits and septic tanks) Tue, 22 Nov 2016 07:09:48 +0000
Re: Vacuum truck, vacuum tanker - what is it? Simple definition for lay people? - by: JKMakowka http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19583 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19583
The definition itself should probably include the most typical use-case in the first sentence, i.e. emptying of septic tank sludge. The exact diameters of the pipes or the exact type of vacuum pump seems less important though.

Maybe a sentence on the maximum typical lift (and related maximum length of suction hose) could be included as that seems to be a practical question that comes up now and then?]]>
Faecal sludge transport (including emptying of pits and septic tanks) Thu, 17 Nov 2016 02:01:11 +0000
Vacuum truck, vacuum tanker - what is it? Simple definition for lay people? - by: muench http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19578 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/19578-vacuum-truck-vacuum-tanker-what-is-it-simple-definition-for-lay-people#19578
As a layperson, many people would check here on Wikipedia:
en.wikipedia.org/wiki/Vacuum_truck

The first paragraph (which is the so called "lead" and is very important) describes it like this:

A vacuum truck or vacuum tanker is a tank truck with pump designed to pneumatically load solids, liquids, sludge or slurry through suction lines typically 2 to 4 inches (5.1 to 10.2 cm) in diameter with 3" or 3 inches (7.6 cm) being the norm. The typical pump used is the rotary vane vacuum pump. The truck can be configured to be a direct belt drive, or a hydraulic drive system. There are two different ways to mount the pump: either directly on the truck with the vacuum drive powered by the truck motor, or on the trailer with an independent motor. Each application has different handling characteristics.

Vacuum trucks which collect fecal sludge usually have a volume of 10 - 55 cubic metres.[1] They generally use a low-volume sliding vane pump or a liquid ring pump.[1]


(the last two sentences were added by me today. Reference 1 is the FSM book by Sandec).

However, I am not that satisfied with this explanation. Is it really correct? Is it easy to understand? And is it true that a vacuum truck and a vacuum tanker is the same thing?

I checked in the Sandec book on FSM but didn't find a satisfying definition. The book also has no glossary. (www.eawag.ch/en/department/sandec/publik...management-fsm-book/)

Regards,
Elisabeth]]>
Faecal sludge transport (including emptying of pits and septic tanks) Wed, 16 Nov 2016 16:09:50 +0000
Re: Sludge Dipping Tools Recently Developed - by: dandreatta http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18515-sludge-dipping-tools-recently-developed#19517 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18515-sludge-dipping-tools-recently-developed#19517
Anyway, I've recently developed a series of pit emptying tools based on buckets of various sizes and shapes. The goal is to keep people who clean pit latrines and similar pits clean and above ground, while still accommodating trash in the pit and keeping a fast rate of emptying. The following video:

youtu.be/sIEmYmFTPQM

shows The Sludge Dipper in various forms. This can clear pits with thin to moderately thick sludge, of any depth, with any amount of trash in the pit. (I've recently learned that the bucket can be pushed down into the sludge with a stick, and therefore The Sludge Dipper can also work in fairly thick sludge, thicker than the sludge you see in the video.)

My previous video from about a year ago:



shows the Sludge Digger, a device with a handle than can work easily in thick sludge, with any amount of trash, and any depth of pit. (I've recently learned that if you are working under a ceiling, there are ways of handling The Sludge Digger that can avoid the ceiling, though these methods take a little practice.)

The attached file shows some still pictures of The Sludge Dipper. It also give some technical details not in the video.

I hope these new tools will add to the list of options available to pit emptiers all over the world, and make their jobs easier and healthier.

Towards a cleaner world,

Dale Andreatta]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 04 Nov 2016 14:08:53 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: Janexi http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#19375 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#19375
I work with a 4200l truck it only takes 7 to 15 minutes and it also depends with what type of effruent tht you are working on

Kind regards

Elvis
Janexi Suppliers]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 21 Oct 2016 12:02:31 +0000
Re: Develop new innovation for pit latrine emptying in peri-urban Mzuzu (Malawi) - by: psewor http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/15617-the-sludge-digger-a-device-ive-developed-for-emptying-pit-latrines-septic-tanks-and-similar-tanks-new-video#19228 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/15617-the-sludge-digger-a-device-ive-developed-for-emptying-pit-latrines-septic-tanks-and-similar-tanks-new-video#19228
Thank you for your innovation]]>
Faecal sludge transport (including emptying of pits and septic tanks) Wed, 05 Oct 2016 05:45:57 +0000
Re: Kampala Sanihub Project (Uganda) - by: osbert http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/6315-kampala-sanihub-project-uganda#19198 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/6315-kampala-sanihub-project-uganda#19198 Find some products that the Sanihub has developed from varoius stages over the past few years.
They include; Emptying devices, capture for urban, peri-urban and rural, treatment and reuse of sludge. For regular updates especially as regards field performance follow us on twitter @WFPSaniHub (twitter.com/WFPSaniHub)]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 30 Sep 2016 16:06:57 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: kevintayler http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18964 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18964
Thanks for the responses that are coming in - they are all helping to build the picture. In addition, I have just come across a paper: www.bonnecherevalleytwp.com/userfiles/fi..._Report_Mar_2010.pdf which gives a time of 30 - 45 minutes to discharge a 9m3 tanker by gravity through a 75mm diameter hose.

The hoses on the tankers look to be 100mm diameter, which I guess is normal.

I calculated the flow rate using the equation for an orifice with a short tube outlet, which is q = C x A x sqrt(2gh), where q is the flow in m3/sec, C is a composite coefficient, A is the area of the outlet in square metres, g is the acceleration due to gravity and h is the head in metres.

For a 100mm outlet, this gives a flow of about 27 litres/sec at a head of 1 metre, which suggests something like 37 seconds per cubic metre of capacity. This discharge rate takes just over 6 minutes for a 10m3 truck and just over 9 minutes for a 15m3 truck but actual emptying time is presumably longer because of the influence of the end of the discharge cycle, when the level in the tanker is very low. (I am assuming that a typical tank is about 2 metres deep and that the total head is equal to the depth of water in the tank). This is a simplified approach but it does seem to give emptying tims of the same order (albeit rather shorter than suggested by the information from Seattle and Bonnechere Valley) than some of those quoted from the field). It is beginning to give me an idea of peak flows, which I will use for the design of septage receiving and screening facilities, indicating that it will be best to check actual figures in the field.

I will also go through the information on septage characteristics in the various publications referenced by Daniel and Moritz. One of the interesting things about the Kampala results is that some of the tanks and pits are being emptied very frequently. I presume that this is because of percolation problems and it would be interesting to see whether it would be possible to link emptying frequency to septage strength. My initial quick review of the Kampala results suggests probably not.

I will aim to share drafts of part of the publication that I am working on as they are ready in draft form - it will then be really useful if I can get feedback.

Regards to all

Kevin]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 14:43:40 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: awhitesell http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18961 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18961
There is a company in Seattle that I work with that provided the following information:

The trucks vary in size but most of our trucks are 4000 gallons but we have a couple smaller trucks for getting in tight places that are only 2000 gallons.

Time to discharge depends on whether or not you can pressure off. If you pressure off you can dump in about 10 minutes. If you gravity discharge it takes from 20-30 minutes depending on how the thick the material is, how much garbage is on the material and how often the driver has to stop to clean the dump screen.


I hope that helps a bit.

Andrew]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 13:20:25 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: Moritz http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18958 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18958
Really interesting discussion. I spent some much time on faecal sludge treatment plants but have no feeling of how long it takes to discharge a truck. I sent this discussion to a few colleagues with more field experience (like Daniel) who can maybe also contribute. I got a question recently on the maximum slope that a faecal sludge truck can manage, also an interesting info for faecal sludge transport logistics.

Septic tank FS = Septage COD and TSS concentrations:

www.tandfonline.com/doi/full/10.1080/09593330.2016.1165293
washdev.iwaponline.com/content/5/1/72
www.ncbi.nlm.nih.gov/pubmed/16042250
www.ircwash.org/sites/default/files/Kengne-2011-Vertical.pdf
www.eawag.ch/fileadmin/Domain1/Abteilung...gies/novel_plant.pdf
www.eawag.ch/fileadmin/Domain1/Abteilung...ization_FS_Ouaga.pdf

I hope this helps.

Cheers,
Moritz]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 09:12:21 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: ddiba http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18957 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18957 Please have a look at this report from a faecal sludge characterisation & quantification study in Kampala, Uganda which actually has photos of the samples and the characteristics (www.eawag.ch/fileadmin/Domain1/Abteilung...analyses_kampala.pdf) and this one from a similar study in Hanoi, Vietnam (www.eawag.ch/fileadmin/Domain1/Abteilung...terization_Hanoi.pdf). You can also see more publications about Sandec's work on characterization here www.eawag.ch/en/department/sandec/public...stewater-management/ (under the tab "Faecal Sludge Quantification and Characterization").
I hope they can provide some insights for your work.

Regards,
Daniel]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 09:00:04 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: kevintayler http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18956 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18956
Thanks a million for the information - its a really good start. The 7 minutes for the 10,000 litre truck checks reasonably well with my theoretical calculations based on the approximate depth of the tank and an assumed 100mm diameter outlet. You mention the size of the pumps - I was not clear about this as I assume that they are discharging by gravity. The mention of the problems with solids from pit latrines was also interesting. I think that there is a good argument for moving towards water-sealed pour-flush pans in order to reduce problems with solids dumped into pits, assuming that water is available. My understanding is that such pans are still quite expensive in Africa, unlike in South and East Asia where they are cheap. However, I would guess that people are working on that

I will keep in touch with you, Daniel and others who might be interested as I work on this.

Thanks again

Kevin]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 08:49:43 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: Doreen http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18955 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18955
I have spoken to my colleagues who were recently present during desludging of a 10,000 litre exhauster and they mentioned that it took about 7 minutes (sludge was from a septic tank)

I have also spoken to one exhauster operator based here in Nairobi and he mentioned about 20 minutes however due to the content of the sludge (presence of solid waste which gets stuck). He primarily empties pits.

Below is a picture that I took at the discharge site in Nairobi. Note the size of the pumps too.



Best regards,

Doreen]]>
Faecal sludge transport (including emptying of pits and septic tanks) Fri, 09 Sep 2016 08:18:59 +0000
Re: Time taken for faecal sludge tankers to discharge? - by: kevintayler http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18948 http://forum.susana.org/component/kunena/99-faecal-sludge-transport-including-emptying-of-pits-and-septic-tanks/18932-time-taken-for-faecal-sludge-tankers-to-discharge#18948
Thanks a lot for this - could you let me know the size of the tankers as well - approximately will do and the operators should know.

On another point, I am trying to get together information from different places on septage characteristics - in particular BOD or COD and TSS. Any information that you or Daniel have would be really useful. I have a fair amount of information from Indonesia and other places but the more examples that I can give, the better. I know that the strength of septage varies widely but it will be good to get an idea. I will make sure that all the sources of information are identified and credited.

Thanks again

Kevin]]>
Faecal sludge transport (including emptying of pits and septic tanks) Thu, 08 Sep 2016 20:55:32 +0000