Indrajith Udaya Kumara: According to my opinion you have to perform laboratory tests to find what the production of methane (biogas) from your septic tank sewage sludge can be. When you know this basic information, you can start to calculate if the process would effective. You must calculate total possible production of biogas, collection and transportation costs, investment cost and further input for economic analysis.

Best regards

Vit

Dear Vit Mateju , Thank you very much for the answer. Could I know how generally such sewage sludge is effective in bio gas production?

I am very sorry Indrajith Udaya Kumara, but there does not exist answer to your question. The quality depends on many factors (how long the sludge is stored in septics, whar are the sorces of sludge and many more), so the only way, how to find correct answer is to perform monitoring and laboratory tests at first.

Best regards

Vit

Dear @Vit Mateju thanks very much for the responses. I am about to perform the experiments

Indrajith Udaya Kumara Septic sludge can still be containing a significant part of fermentable organic matter, so it can surely be suitable for producing biogas in anaerobic conditions. If you want to assess its potential you can perform a BMP (Biochemical Methan Potential) test, but it won't be able as such to predict the dynamics you could possibly find in the final plant. In our experience it is better conducting trials mixing it with parts of a healthy and well functioning anaerobic sludge taken from an WWTP with anaerobic sludge digestion, for example. In general co-digestion of septage with waste activated sludge gives better results than mono- digestion of septage sludge alone.

Dear @Francesco Tabani, thank you very much for the answer. For my BMP results I got comparatively lower values and that is why I was bit worried. So we are thinking of Co-digestion.