Rural domestic sewage staged treatment and reutilization method

The invention discloses a rural domestic sewage staged treatment and reutilization method, and belongs to the technical field of sewage treatment. The method specifically comprises the following steps: S1, pretreatment; S2, membrane biological reaction treatment; S3, preparation of a composite modified photocatalyst; and S4, photocatalytic oxidation treatment. The rural domestic sewage is subjected to staged treatment according to different use requirements, the water body subjected to pretreatment and membrane biological reaction treatment can be used for non-drinking functions such as irrigation, washing, environmental sanitation and landscaping, the water body can be used as drinking water after being subjected to photocatalytic oxidation treatment on the basis, energy conservation andemission reduction are achieved, and the ecological and social benefits are huge. 本发明公开了一种农村生活污水分级处理及再利用的方法，属于污水处理技术领域。具体包括以下步骤：S1：预处理；S2：膜生物反应处理；S3：复合改性光催化剂的制备；S4：光催化氧化处理；根据不同使用需求，对农村生活污水进行分级处理，其中，进行预处理和膜生物反应处理后的水体可用于灌溉、洗涤、环