Miniature waste-water treatment system (100) for biological cleaning of waste-water from one or more households, institutions, recreation centres, business premises and the like, and for up to approx. 50 person equivalents (PE), said treatment comprising aeration and biological filtration of the waste-water, nitrification and chemical precipitation of phosphor. According to the invention, the miniature waste-water treatment system (100) is characterized in that the system (100) comprises a container (1) with a solid filter element (13) and a post-clarification zone (21), the system (100) has elements (15, 16, 17) to lead air in counterflow in relation to the waste-water, a pump (9) controlled by a level switch is provided in a pump well mounted on the side of the container (1), a time-controlled pump (33) is arranged to dose waste-water to a precipitation chemical (18), and the system (100) has elements (27, 28, 29, 30) to lead sludge which, by the aeration and chemical precipitation is deposited in the bottom of the container (1), to a sedimentation tank (200) which is placed upstream from the system (100).
展开▼
