Tender For Designing, Engineering, Supplying And Constructing 20 Tons Per Day Capacity Cattle Dung-Based Bio-Gas Plant With Supplying And Laying Of Piped Gas Distribution Network At Bhartiya Harit Khadi Gramoday Sansthan, Village Khanwan, Nawada, Bihar, Epc Of 20 Tpd Biogas Plant With Pipeline Network At Nawada, Bihar