The GLSS section was further divided into two parts; bottom half was tapered with a slope angle (Ø) of 60 and top half was a 20 cm long column with an internal diameter of 22 cm. An inverted canopy was also attached with the top lid of GLSS in order to promote coagulation of suspended/colloidal particles, boost the collection of suspended particles to enhance the collection of biogas and to control the washout of particles