METHOD FOR PRELIMINARY CLEANING OF WASTE WATER AND METHOD FOR CLEANING HOUSEHOLD WASTE WATER USING THE METHOD OF PRELIMINARY CLEANING

摘要

A preliminary purification method is proposed, which includes the following steps: (1) the supplied wastewater is introduced into the first end of the first aeration tank and mixed with the first concentrated sludge mixture in order to obtain the first sludge mixture; (2) aerating the first sludge mixture in the aeration section of the first aeration tank to obtain a second sludge mixture at the second end of the first aeration tank; (3) the second sludge mixture is introduced into the first settling basin and subjected to purification by settling to obtain a settled liquid and the first concentrated sludge mixture; (4) the settled liquid is drained and at least a portion of the first concentrated sludge mixture is returned to the first end of the first aeration tank. However, a method for the treatment of domestic wastewater using the method of pre-treatment of wastewater. The pre-treatment method can be stably used for a long time without draining the sludge.