Rice Husk ash - Safe Disposal after use.

[Vijai Ganapathy]

Dear All,

I would like to get experts view on safely disposing or using the Rice Husk after it has burn completely.

Currently I am using Rice Husk stove [ based on Prof. Alexis Belonio Design] . This stove has come in real handy for our home and works without any issue. It works up to 50 Minutes for single burn and works without any issue till date.

The only issue I am facing currently is how can I dispose burnt rice husk ash.  Can I use it for any other purpose. what is the environmental impact of this ash being disposed without any care?

Regards,

--
Vijai Ganapathy
Mailto: Vijai.G...@gmail.com

[Manu Sharma]

Hi Vijai,

Thanks for sharing your experience with biomass cookstove designed for rice husk. If there are images and specifications of the stove you are using, do post. 

As to rice husk ash - you can use it as a bio-fertiliser in field crops or potted plants. It also has some degree of insulation properties though far less than rice husk on its own. Rice husk ash has been used as a material in biomass cookstove body to provide insulation due to its fire-resistance properties. 

Apart from this, it's quite inert and not hazardous at all so there's no harm if it seeps into soil.

Thanks,

Manu

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[Vijai Ganapathy]

Dear Manu,

Thanks for the reply. Please find attached pictures of the stove.

I bought this product from ndmi.co.in and you can find specification of the same in http://www.ndmi.co.in/Agni_Sun.html

Though the cost is high 6000/= for this unit, saving fuel cost through this model is high and it reduces the usage of LPG stove also.

They also have continuous running model for commercial applications http://www.youtube.com/watch?v=LqovQS84L8A 

Let me know if you need more information.

[Manu Sharma]

Dear Vijai,

Thanks for this. That's quite expensive but I suppose useful for areas with abundant rice husk waste and no other form of biomass.

Thanks

Manu

[Vijai Ganapathy]

Yes. It is expensive. I am thinking of building my own which will reduce the cost by more than 50% if am correct.

[tee jay]

Hi ,

I had been working with huskpower systems in trying to improve their gasifier operations by engineering innovation, with one of the mandates being totally pollution free.

I was curious about the stove and did try to get some idea about the principle of operation. I did visit the site of the NDMI but did not get this info - the particulate discharge and co/co2 ratio after combustion did not seem very relevant and 25% efficiency (the method of determination?) was also not very clear.

I did see a reference of "gasifier" in the NDMI site.

I would like to know if the ash colour before I can add meaningful content to this discussion.

T.Jayaraman

T. Jayaraman
SECO Group
14, Bethel Nagar,
Perungudi,
Chennai 600096

Ph : off +91 44 2496 1434/ 2496 2995
Fax - +91 44 2496 2996  Home +91 44 2448 7684

Website : www.seco-india.com

Be smart - Be green

[Manu Sharma]

Dear T Jayaraman,

As Vijai said, stove is based on Prof. Alexis Belonio design. A booklet on the stove written by the Prof can be found here. It discusses the rice husk gasification principle from page 37 onward.

Thanks

Manu

[tee jay]

Thanks manu

Thanks for the info.

I do think that the rice hisk combustion would not be complete and the char would have sufficient carbon.

while carbon by itself is not an issue, it is possible for some tar to remain with the Char.

While due to distribution there would be no issues of large pollution, it is a point to thin about.

If the carbon content is sufficient, we have found that just with water, these can be briquetted.  The ash from the briquette would have many applications - (one interesting application we want to try is use it as a plaster on clay walls)

T.Jayaraman

[Manu Sharma]

The most advanced commercial small-capacity biomass gasifier design I've come across - it emits virtually no tar - is by All Power Labs, California. Their gasifiers start from 10 KW and are quire popular. They claim to have sold more biomass gasifiers in the world than any other supplier since WWII.

They also sell a gasifier kit starting at around $1800 (the gasifier kits webpage is presently down as they are moving their website to a new design). Although their design is for wood and pellets whereas you are working with rice husk feedstock, still I thought you might find this useful.

Manu

[Sampath Kumar]

Dear Sirs,
Bio char from rice husk is excellent additive to soil for good plant growth. In fact it has commercial value, The Silica from rice husk burned at endothermic conditions is amorphous. It is good for plants. It also has use as cement additive for increasing the strength of concrete.
Sampath Kumar
Nualgi Nanobiotech

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From: orang...@gmail.com
Date: Sat, 9 Feb 2013 08:22:59 +0530
Subject: Re: [Green-India] Rice Husk ash - Safe Disposal after use.
To: green...@googlegroups.com