This work focuses on the characterization and conversion of post coagulation sludge (PCS) from paint wastewater coagulation using nano Konki-De into biogas. Paint wastewater, snail shell flour (SSF) and PCS were used as raw materials. The nano konki-De (crude protein) extracted from SSF sometimes referred to as coincholin was used as the coagulants, while the PCS recovered after coagulation process was used for the biogas production. Modified Fernadez-Kim method, Jar test experiment and anaerobic digestion were used for bio-coagulant extraction, wastewater treatment and biogas production, respectively. SEM-EDX, FTIR and XRD studies were undertaken, to understand the structure, composition and crystalline nature of nano Konki-De and PCS. The biogas was characterized using gas chromatography (GC). Premised on experimental and instrumental analysis, the active ingredient in SSF was found to be Nano Konki-De, a chitno protein. Paint wastewater contains 2598 mg/L total suspended particles and 110 mg/L total dissolved solids in excess of NERS standard. The post coagulation sludge contains total solid of 222 g/L, high volatile solid content (76% total solid) and carbon to nitrogen ratio of 25:1. The actual gas production started after the lag period of 4 days. Maximum daily yield of 80 mL was obtained at the 20th day while the cumulative yield of 250 mL was recovered within the retention time. The kinetics of bio-fermentation process followed logistic models amidst the five kinetic models investigated.