SuSanA - Forum Kunena Site Syndication http://forum.susana.org/ Thu, 05 May 2016 17:59:31 +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 Re: UASB Design for Industrial wastewater treatment - by: muench http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/14931-uasb-design-for-industrial-wastewater-treatment-looking-for-good-references#15670 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/14931-uasb-design-for-industrial-wastewater-treatment-looking-for-good-references#15670
Your post didn't get a response yet but I just wanted to confirm that yes, this forum is indeed the right place to discuss industrial wastewater treatment, too. We have not yet often talked about it on the forum but that can and should change.

About UASBs for domestic wastewater treatment, perhaps you find something useful in this thread:
forum.susana.org/forum/categories/35-bio...s-for-building-uasbs

Also, I see that you're based on Florianopolis, Brazil. You should meet up with Christoph Platzer (from Rotaria) who lives in the same town if I am not mistaken - or perhaps you know him already. Christoph has also been an active contributor to this forum in the past.

Regards,
Elisabeth]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Thu, 29 Oct 2015 09:29:40 +0000
UASB Design for Industrial wastewater treatment (looking for good references) - by: ivarurdalen http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/14931-uasb-design-for-industrial-wastewater-treatment-looking-for-good-references#14931 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/14931-uasb-design-for-industrial-wastewater-treatment-looking-for-good-references#14931
I am looking for good references in terms of the design of UASB reactors for high strength industrial wastewater (dairy, slaughterhouse, poultry, etc.)

Currently I am using:
- Biological wastewater treatment in warm climates, Von Sperling (More for domestic wastewater)
- Handbook of biological wastewater treatment, Van Haandel
- Biological Wastewater Treatment: Principles, Modelling and Design
- Papers from Lettinga, Netherlands.
- Different scientific articles.]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Tue, 15 Sep 2015 08:22:51 +0000
Re: Are there any issues with anaerobic digestion of faecal sludge? - by: vishwanathdalvi http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge-disposal-of-the-concentrated-fecesurine-question-from-mumbai-india#14526 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge-disposal-of-the-concentrated-fecesurine-question-from-mumbai-india#14526
Thank you for your reply. It is helpful to know that some urine entering the digestor is ok. It was especially important to know that the effluent of the anaerobic digestor is not strictly safe for environmental disposal.

We have had a look at Flycatcher's digestor. They claim to get good rates for kitchen wastes: something like 2 kg/day of waste treated in a 250 litre vessel. Their effluent is a low viscosity liquid that does not have a repulsive odour: which can be used as fertilizer for flower beds. This unit seems good for treating the fecal matter of a family of 5 (assuming 250 gms/day of fecal matter produced per person).

We are developing a unit that uses air to flush. The fecal matter is sequestered from the environment by allowing it to sink through a bed of particles and is removed from the bottom. The problem was what to do with this fecal matter and how to recover the particles that are lost with the fecal matter.

The anaerobic digestor seems to address both problems. By dumping the fecal+particle mix into the digestor, the particles (which are hydrophobic and lighter than water) will separate from the fecal matter: which will degrade. The particles can be collected from the overflow of the digestor and dried (basically to destroy the liquid bridges that make them clump) and recycled to the "flush" system.

A readily apparent problem with Flycatcher's systems are that the digestor gets upset without warning. Once it is down, it needs something like 30 litres of inoculum to get going again.

Another problem is what happens if there is a sudden spike in toilet use (guests coming to stay) or a drop (family goes on vacation). Anaerobic systems go belly up in such cases. Is there a solution?

Could an aerobic system be preferred in this case: we will forego the methane in exchange for reliability?

Really appreciate your inputs.

Vishwanath]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Sun, 16 Aug 2015 14:07:18 +0000
Re: Are there any issues with anaerobic digestion of faecal sludge? - by: muench http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge-disposal-of-the-concentrated-fecesurine-question-from-mumbai-india#13847 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/13172-are-there-any-issues-with-anaerobic-digestion-of-faecal-sludge-disposal-of-the-concentrated-fecesurine-question-from-mumbai-india#13847
Your question was rather broad. What would be your treatment objectives with the anaerobic digester technology?
I had a quick look at the "Flycatcher" website link. The website looks quite snazzy but without much details. It seems to me that they have only used organic solid waste as in input but not fecal matter.

Anaerobic digestion will not destroy the pathogens in the faeces, so therefore the question is what do you plan to do with the digestate? Using it as fertilizer could be an option but safety precautions would apply.
Adding the urine is not a problem as such but it won't give you any additional biogas and will instead shorten the hydraulic retention time which is a disadvantage.

These are just some pointers. Maybe you could tell us more about your project and plans?

(more details on your research project are available here but it is not saying anything about anerobic digestion there:
forum.susana.org/forum/categories/141-ot...the-toilet-challenge)

You might also find some pointers in the other threads here:
forum.susana.org/forum/categories/35-bio...n-systems-and-dewats

Regards,
Elisabeth]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Wed, 24 Jun 2015 21:22:34 +0000
Re: Implementation of DRDO Biotoilet through Public-Private model in India - such as Banka Bioloo - by: bankabio http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/11463-implementation-of-drdo-biotoilet-through-public-private-model-in-india-such-as-banka-bioloo?limit=12&start=12#13799 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/11463-implementation-of-drdo-biotoilet-through-public-private-model-in-india-such-as-banka-bioloo?limit=12&start=12#13799
Responses:
Can a bio-digester accommodate used toilet paper? - to a very minor extent, may be ok - but not in larger quantities.
What happens if people throw in things like chewing gum, plastic wrappers, cigarette buds in the toilet. - these get collected and will need to be removed periodically. Ideally, people shouldn't throw.
Is there a filtration mechanism for such non degradable waste? - Not at this time, but we plan to develop soon.

Can the effluent water be used again in the flush tanks? - Yes
Is there any chemical filter used in the bio-digester? Not really, in the general sense. Though chemical filtration is used in certain cases.]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Mon, 22 Jun 2015 18:14:42 +0000
Re: Implementation of DRDO Biotoilet through Public-Private model in India - such as Banka Bioloo - by: Sahej http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/11463-implementation-of-drdo-biotoilet-through-public-private-model-in-india-such-as-banka-bioloo?limit=12&start=12#13794 http://forum.susana.org/forum/categories/35-anaerobic-treatment-systems-dewats-uasbs-abrs-biogas-sanitation-systems/11463-implementation-of-drdo-biotoilet-through-public-private-model-in-india-such-as-banka-bioloo?limit=12&start=12#13794
Can you please answer these two questions for me?

1. Can a bio digester accommodate used toilet paper? What happens if people throw in things like chewing gum, plastic wrappers, cigarette buds in the toilet. Is there a filtration mechanism for such non degradable waste?

2. Can the effluent water be used again in the flush tanks? Is there any chemical filter used in the bio digester?

Thanks,
Sahej]]>
Anaerobic treatment systems (DEWATS, UASBs, ABRs, biogas sanitation systems) Mon, 22 Jun 2015 13:59:45 +0000