Vermi-Trickling Filters (or vermifilters) for Sewage Treatment (looking for help to design)
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TOPIC: Vermi-Trickling Filters (or vermifilters) for Sewage Treatment (looking for help to design)

Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 17 Apr 2017 10:46 #21256

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    goeco
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  • Self employed innovator with an interest in wastewater treatment systems and recycling of nutrients
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Hi Bogdan,
from memory they are 1m x 1.2m and about 900 high, about a cubic metre of capacity.
I tend to pipe greywater directly to the secondary reactor because the purpose of the primary digester in my design is to filter out and digest solids, not purify the wastewater. Thus kitchen greywater could go through the primary digester to remove any solids, but bathroom/laundry greywater gushing over poo might actually pick up fine solids? Piping laundry/bathroom greywater directly to the secondary filter for purification along with primary-treated blackwater makes more sense to me. I'm sure I could put all my wastewater through the primary treatment vermifilter though and welcome anybody trying out alternatives then sharing the results from these... this is an evolving technology!

cheers
Dean
Dean Satchell, M For. Sc.
Go-Eco Sustainable Solutions
www.go-eco.co.nz
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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 17 Apr 2017 15:30 #21257

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    guilherme
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I´ve done that Dean. I´ve set up a vermifilter initially for a local NGO site for black water only, but the system receives high doses of greywater (shower) during the courses they offer there every now and then. I felt that the effluent was not adequate for shallow infiltration because it´s quite near a swimming pond, so I decided instead to add on a constructed wetland as a 2nd stage, before actual infiltration. The vermifilter handles this additional flow quite well during the course of events, which usually lasts no more than 3 days, but one can see that there´s a real restriction on flow throughout theses days.

You can see its overall aspect on the image below. Looks great and no fowl odor at all.

I haven´t had a chance to do lab tests on this one as of yet, but as soon as I do I´ll let you know.
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Guilherme Castagna
Fluxus Design Ecológico
São Paulo/SP - Brazil

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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 17 Apr 2017 19:13 #21258

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    BPopov
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Hello Guilherme!


Could you please , share what is volume of your primary vermifilter and what was approximate waste water load on it per day including grey water from the shower?

Regards,
Bogdan
Bogdan Popov
Master Eco-smith
The Ecosolutions Forge
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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 18 Apr 2017 14:14 #21270

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Hi Dean! Are the worms able to get through the shade cloth when the migrate from one crate to the other? To my memore shade cloth holes are around 3 mm diam. I have seen recently in Norway some kind of heavy duty shade cloth hanging in the building store and really liked it (see picture attached)
20170321_163607_resized.jpg



Stacking the secondary treatment crate directly under primary one sounds interesting however I would go for some kind timer operated dosing sprinkler for the secondary filter and put respectively accumulating pump/syphon tank before it.
What I would think also about is to have a separate small volume basket primary filter for kitchen sink filled with wood shavings to get rid of the grease and soapy cleaners (an aerobic grease trap). They are quite effective even without worms.

Regards
Bo
Bogdan Popov
Master Eco-smith
The Ecosolutions Forge
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Last Edit: 18 Apr 2017 15:45 by BPopov.
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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 19 Apr 2017 08:41 #21278

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Hi Bogdan,
keep in mind the primary reactor will be dosed every time you flush, which if stacked would then dose the secondary reactor below. Why would you dose the secondary reactor? Be careful of using sprinkler nozzles, the bacterial slime will block them up. I see dosing as only essential at the outlet where you'd dose surface irrigation drippers.

I reckon the worms should squeeze through the gaps in your shadecloth ...if they ran out of food on one side they might have to slim down a bit before they can get through!

Yes, I have a 230 litre drum-sized vermifilter specifically for my kitchen water. It was going for a few months before I added the worms. The solids and grease built up on the surface of the media (I was shoving anything I could fit down the plughole) so the liquid was then draining through the shadecloth sides, which also got clogged with grease, impeding drainage and making a pool. Once the worms were added they soon dealt with the buildup of solids on the surface and drainage was effective again. The grease condenses on the first surface it finds and in my case almost sealed the filter! Definitely wider filters are always more reliable.

Guilherme, I wonder if you would have better effluent quality if you piped the shower water straight to your wetland rather than through your primary vermifilter? Or set up a dedicated vermifilter for all the greywater that discharges to the wetland? They are so easy and cheap to construct, I'd need convincing that it is a good idea to put shower water through a poo vermi-digester...

cheers
Dean
Dean Satchell, M For. Sc.
Go-Eco Sustainable Solutions
www.go-eco.co.nz
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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 19 Apr 2017 19:10 #21283

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    guilherme
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Hi Dean,

The idea is to really separate black and greywater, and direct greywater straight to the constructed wetlands (a floating wetland with emergent species over a bamboo rack, btw), but this involves a future refurbishment that was not possible to happen, as of yet. In other words, this is a temporary solution.

Best to you all, and thanks for your work and attention!
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Guilherme Castagna
Fluxus Design Ecológico
São Paulo/SP - Brazil

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Re: Vermi-Trickling Filters for Sewage Treatment (looking for help to design) 19 Apr 2017 19:39 #21284

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Dear Bogdan,

The vermifilter I mentioned was built using 1m (diameter) concrete rings. They consist of 2 rings of 0,5m high put one on top of the other, totalling 1m as well. This was my first vermifilter and I thought, based on the studies I had read by then, that it´d be better to get the effluent applied to an area that would be larger than the plastic tanks I had found so far, but not wide enough to create preferential flows since the effluent comes in from a 100m pipe, straight from the toilet + shower.

As I mentioned to Dave, my original plan was to have it receiving blackwater only, a load varying from 5 PE to 20 PE (person equivalent). It now receives usually 1 PE on a day to day basis, and up to 20 in single events. It has already received the volume of up to 20 showers/day in events, whereas today it´s not more than 8/10, as we have been able to build a separate installation for additional showers, which have helped to reduce the load.

Good work out there, best from Brazil!
--
Guilherme Castagna
Fluxus Design Ecológico
São Paulo/SP - Brazil

email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Web: www.fluxus.eco.br
Skype: guilherme.fluxus
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