Biogas from ABR

  • jens.born@fh-flensburg.de
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Re: Reply: Biogas from ABR

Dear Anthony,

why don't you use a drum in drum solution for collecting the gas for further applications (cooking, lighting etc.)

Best regards Jens

-- Prof. Dr. Jens Born CATS Green Process Engineering Flensburg University of Applied Sciences Kanzleistr. 91-93 D-24943 Flensburg

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  • AquaVerde
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Re: Reply: Biogas from ABR

Welcome Mr. Born, :)
I am very happy you are joining this open discussion forum on the ABR-subjects.

Would you advice your suggested "drum in drum solution for collecting the gas" as well for each ABR-compartment, e.g. from 2 to 4?

Have a nice holiday.

All the Best
Detlef SCHWAGER

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  • Nanchoz
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Re: Reply: Biogas from ABR

Dear Antony

I saw your discussion on the plattform. I am a consultant for decentralized ww treatment and reuse systems, with special focus on anaerobic reactor technology. If you like mail me your questions regarding settler, ABR, ... on my email, I can help you.

Best Regards

Nanchoz Zimmermann Autark Engineering AG ipad email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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Re: Reply: Biogas from ABR

Dear Nancoz,
Why not keeping us all informed on the subject via this forum?
This forum is living from open discussions and exchange of ideas...

I checked out your Autark Engineering company web page autark-engineering.ch : Congratulation! You and your colleagues put the ABR (CH: Schikanereaktor) in the right order, as the KEY (core treatment) as it is my own "belief" to do so too. See my little "try and errors" with some very small ABRs (6-30 pe) still without using biogas and ventilating methane to the atmosphere as all the septic tanks do so: www.aqua-verde.de/page4.php?view=thumbnailList&category=6

By my guessing + under our "cold" conditions, the use of biogas will be "possible" starting by 200 p.e.. The Engineer from BORDA Mr. Sasse said 1998s min. 20 m3/d and COD 1000 mg/l. What is your experiences under "our" cold conditions? The anaerobic treatment steps (Hydrolysis/Acidogenesis/Acetogenesis/Methanogenesis) need different pHs, Temperatures and HRT/SRT, How you "steer" this (keeping all systems simple as possible, by intention), just by different camber geometries and probably different heating temperatures for each camber?

All the Best
Detlef

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Re: Reply: Biogas from ABR

FYI: nice explanations of anaerobic processes in relation to multistage ABR = HRAR technology

www-Source BALKWASTE: www.wastedb.eu/index.php?option=com_cont...=2&Itemid=21&lang=en
...the anaerobic fermentation of biowaste can be operated by one-stage or two-stage fermentation.

In the one-stage process (Table8) all fermentation stages (e.g. hydrolysis, acidification, acidification and methanogenesis) take place in one reactor; therefore, optimum reaction conditions for the overall process are not achieved, due to the different environmental requirements during the various stages of the fermentation. Therefore, the degradation rate is reduced and consequently the retention time increases. The basic advantage of one stage process operation is the relatively simple technical installation and operation of the anaerobic digestion plant, whereas the costs are lower.

In two-stage processes (Table8), the hydrolysis and acidification- acidification take place in one bioreactor, while methanogenesis is carried out in a separate reactors thus providing flexibility to optimize each of these reactions so that e.g. mixing and adjustment of the pH can be optimized separately, permitting higher degradation degrees and loading rates. In two-stage processes the retention time of the substrate is significantly decreased. However, such systems involve more sophisticated technical design and operation and subsequently higher costs.
In the first [stage] reactor, organic fraction is hydrolyzed producing dissolved organics, organic acids, CO2 and low concentrations of hydrogen. The reaction rate in the first reactor is limited by the rate of hydrolysis of cellulose.
In the second stage the highly concentrated water is supplied to an anaerobic fixed-film reactor, sludge blanket reactor, or other appropriate system where methane and CO2 are produced as final products. In the second reactor the rate of reaction is limited by microbial growth [methanogenesis] (Verma, 2002).


The ABR = HRAR is basically a simplified two-three-stage biogas reactor having not the disadvantage of more sophisticated technical design and operation and subsequently higher costs, as above mentioned. The ABR is a multistage biogas reactor with intentional simplifications, in order to achieve a higher overall robustness by accepting some efficiency droppings.

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Re: Biogas from ABR

Hi Anthony,
You started this discussion on Biogas-ABRs (HRARs)...
I am interested to hear from you and about possible upcoming results on ABRs.
Take care
Detlef

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  • Anthony
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Re: Biogas from ABR

Hi detlef,

Thank you for your enthusiastic marshalling of this discussion, i never expected to learn about constructed peatlands or bouncy-castle ABRs, but what is a große Party filter? (see aquaverde in thüringen).

It is great to see such an active community of researchers of ABRSs, DEWATS, Anaerobic Digestion, and everything in between. i wonder however if there is a catalogue of DEWATS projects from around the world, showing a level of information akin to that presented in BORDA's Guide to DEWATS (2009)? I am working on such a catalogue in Haiti, but the projects are 'pure' biodigester projects, i.e. no ABR's yet in service.

I will of course update the forum on the ABR Project which kickstarted this discussion, as it goes to site next month (si dye vle).

Best wishes to all,
Anthony
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Re: Biogas from ABR

Dear Anthony and dear All,

Party-Filter?


at: www.aqua-verde.de/page4.php?view=preview&image=63&category=6

Filtration of suspended solids (TSS) by effluent filter. This filter is part of the outlet of septic tank and sits inside tank. Original developed by Mr. Zabel (USA) www.zabelzone.com/Technical.html in the 50's to protect septic tank filtration systems against clogging by suspended solids. For the CWs we use it since 2009 for "policing" CWs against clogging. Mr. Maik HERRMANN of Aqua-Nostra CW-company used it first in Germany and called it "Police-Filters". The overflow from suspended solids from septic tank to CW occur most during party's and their high water consumption and "releasing" by guests. A funny female government officer told me after this explanation: " Aha, Mr. Schwager you have also "Party-Filters...". I like her funny idea more them dull "Obama-Filters". In other words if you run many parties without protecting the CW against suspended solids from septic tank, it will clog (colmate) over some time.

from Zabel's web page:

" It is thought that the combined action of the bio-mat growing on the filter discs, the improved effectiveness caused by the retention of the nutrients in the tank, and the reduction of organic solids in the effluent stream achieve these results. The higher concentration of nutrients and increased action help the tank remain fully functional even in cold weather climates."

Zabel effluent filters
Outlet filters (effluent filters): Effluent filters are a device that replaces the common outlet baffle. They are designed to trap and filter particles that are suspended in the liquid in your septic tank and prevent them from being flushed out into your leach field where they can clog the soil and cause an early failure of your field. We use either Zabel or Polyloc effluent filters. Both filters have a proven and documented history of performance and will provide an improved effluent quality that will promote a long field life. The cost of the filter and installation are gotten back by simply having your field last just one year longer than it would have without a filter. An effluent filter can save you thousands on a costly field replacement.

How the Zabel Filter Works
The Zabel Filter performs two primary functions n a septic system installation. It retains the solids in the tank and lowers the BOD (biological oxygen demand). This retention of solids and reduction of BOD's markedly improves the quality of the effluent and assists in the protection of the ground water.

The retention of 90% of the solids in the tank is achieved three ways.

First, all particles larger than 1/16" b]1.6 mm[/b are mechanically filtered as they attempt to move through the filter and leave the tank.

Second, the filter dramatically slows the velocity of the effluent over the disc dam allowing the particles that are negatively buoyant to fall to the bottom of the tank.

And third, particles attach themselves to the bio-mat growing on the filter discs. Anaerobic organisms cause the particles to disintegrate, lose their buoyancy, and fall to the bottom of the tank.


Field reports show BOD's have been reduced 45% or more.

It is thought that the combined action of the bio-mat growing on the filter discs, the improved effectiveness caused by the retention of the nutrients in the tank, and the reduction of organic solids in the effluent stream achieve these results. The higher concentration of nutrients and increased action help the tank remain fully functional even in cold weather climates.

Modulating Flow:
The flow Reducer Plate allows the engineer to predetermine the maximum outflow allowed into the dispersal system and thereby control the retention time of the tank. In most residential systems this is not an issue, but is important in some commercial applications.

Servicing the Filter:
The filter is virtually self cleaning. The continued action of the anaerobic organisms on the filter discs causes lodged particles to disintegrate and fall to the bottom of the tank. The filter usually only requires servicing at the normal inspection and pumping intervals required of a standard septic installation. Because the filter does not require an increase in the frequency of tank pumping or inspection, access to the tank does not have to be modified from the standard septic tank installation. A riser and lid are not required by the manufacturer.


"Field reports show BOD's have been reduced 45% or more."
This marketing-information I would not buy straight... I would check it several times by independent colleagues.

Up to now, I experienced with the narrow 0,4 mm slots of Party-Filter in last camber of ABR a higher level of suspended solids level, them in first camber (see above photo), same in ordinary 3-cambers septic tank. Without Party-Filter this "stopped" suspended solids would end up in the CW and will clog the CW over long time accumulation.

BORDA started to use this very simple Party-Filter in "their" ABRs in Afghanistan too, to protect effluent filtration.

On the mentioned catalog of DEWATS projects with high level of information akin to that presented in BORDA's Guide, unfortunately I can not help, but maybe others like Mr. N. Zimmerman and Mr. H-P Mang or BORDA or EWAG/SANTEC by them self. I am searching on this too, I am interested in successful tropical experiences on simple sewage "multistage biogas plant" like an ABR is in combination with CHP. But as well I am interested in unsuccessful experiences as they are very important, them only from own mistakes and from others you can really learn.
Like our children do so :) (si dye vle)

All the Best
Detlef

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