Sewage sludge which mainly comes from the primary settling tank and discharge of surplus sludge is the deposit produced in each operating unit in municipal wastewater treatment plant.
城市污泥是城市污水处理厂经各级处理净化污水而产生的沉积物，主要来自初沉池和剩余污泥的排放。
2
Gas from entering the spiral cavity suction tank by compression and exhaust through the exhaust orifice discharge cavity.
气体由吸气腔进入螺槽内，经压缩后通过排气孔口和排气腔排出。
3
Gas (working fluid) from entering the spiral cavity suction tank by compression and exhaust through the exhaust orifice discharge cavity.