Dear Mr. Krishna, thanks a lot for throwing light on the mystery of the Wardha biogas plant. To be fair to Dr. Soham Pandya, I must say that he mentioned that it was Chinese technology which he had modified to some extent. Yours A.D.Karve
On Wed, Oct 27, 2010 at 12:48 PM, Murali Krishna <[email protected]>wrote: > Dear Dr.Karve, > > I had been to Wardah and visited the said digester at CSV, two years > back. This digester was actually designed by Mr.Jianan Wang, a professor of > Physics from China. This digester is known as Puxin Biogas model. It works > on water Hydraulic Pressure. It is a mix of Deenabandu and Floating Drum. > The size and weight of iron drum is bigger and heavier in floating drum > model than Puxin digester. > It is usually fed once in six months. The feeding rate is normal. It does > not yield more gas than any other Indian digesters. The digester's is > designed for 40/50 days HRT and is fed once in six months. Farmers of China > fed this digester with waste grass clippings and dung/pig manure, etc. They > are emptied once in six months and spread on their agricultural fields. > Since there are dry grass clippings and sufficient enough nitrogen material > is available (C:N ratio is maintained) and the quantity of feed stock is > loaded for six months, the digester is giving 3 cubic meter gas every day > without further feed. > > You w ere not properly appraised by the people at Wardah for they > themselves are not sure of the feed rate and no study is being conducted. > You must have observed theat at CSV they have a canteen on the premises and > everyday kitchen waste is fed into the digester. This they never consider > nor bring into the notice of anyoneav. Similarly the same digesters which > they have built at the restidential colony is connected to night soil > regular feed source. > The digester is 10 cube meter and it is giving only 3 cube meter gas. As > per the inventor in China's weather it will give 5 to 6 cube meter gas. I > had been exchanging correspondence with Mr.Jianan for more than two months > during 2008-09 for designing 100 cube meter digester and go for 1 MW unit. > As the cost is quite exhorbitant and my customers does not want this > model. The advantage with this model is .....it is easy to empty and fill > the digester. This digester can be used for continuous feeding also. I > have built this digester at Hyderabad and the mould was lent by CSV. > > This is a patented model for water hydraulic pressure and unfortunately the > inventor's efforts are never acknowledged and many claim that it is their > own invention. > > Regards, > > Murali Krishna. > > > On Sun, Oct 24, 2010 at 12:13 AM, Anand Karve <[email protected]> wrote: > >> Dear Dr. Martin, >> I have just returned from a city called Wardha, where I attended a >> workshop arranged jointly by the Research Councils of UK and the Department >> of Science and Technology, Government of India. About 20 scientists each >> from UK and India were invited to this meeting. >> In the course of field visits organised during the workshop, Dr. Soham >> Pandya, The Director of Centre of Science for Villages, an NGO in Wardha, >> showed us an amazing biogas plant on his campus. This biogas plant accepts >> about 1000 kg cattle dung as a one-time load and produces daily about 3 >> cubic meters of biogas, continuously over a period of about 180 days. This >> is not the only biogas plant constructed by him. Using funds from the >> Department of Science and Technology, He has constructed a similar biogas >> plant in another place called Hingoli, where a one-time load of 1000 kg >> dung yields biogas continuously for 6 months, to run an electricity >> generator for daily 3 to 4 hours, to provide electric lighting to all the >> houses in the village. Officials of the Department of Science and >> Technology vouched for the veracity of these claims. According to text book >> knowledge, 1000 kg dung should have produced about 30,000 litres (or 30 >> cubic meters) biogas. But this particular biogas plant produces 540 cubic >> meters of it. >> Neither Dr. Pandya nor any other scientist could give a >> scientific explanation to this phenomenally high yield of biogas. Dung of >> Indian cattle consists mainly of lignin (from the veins and midribs of the >> grass and leaves that they feed on) and micro-organisms. One has to assume >> in this case, that there are microbes in the dung that feed on the lignin >> and that the methanogens digested the lignin eating microbes. >> Yours >> A.D.Karve >> >>
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