Combined enhanced treatment process for micro-pollution high-ammonia nitrogen raw water

The invention discloses a combined enhanced treatment process for micro-pollution high-ammonia nitrogen raw water. The treatment process is characterized in that under the conventional condition that the content of the ammonia nitrogen in raw water exceeds 3mg/l, the treatment process comprises the following steps: the raw water is firstly subjected to sedimentation by a flocculation horizontal sedimentation tank or a high-efficiency sedimentation tank, and then biological pretreatment is carried out by adopting a biological contact oxidation pond, effluent water enters in a homogeneous filter media air water backwashing sand filter or a sequential backwashing sand filter for filtering and then is conveyed into an ozone contact reactor for oxidation, and enters an active carbon sand filter for filtering, and effluent water is delivered into a water distribution network by a water carriage pump house after passing through a clear water pond for regulation and storage. According to the invention, the biological contact oxidation pond is arranged behind the flocculation horizontal sedimentation tank or the high-efficiency sedimentation tank, thus reducing influence of sludge sedimentation on the running of the biological contact oxidation pond. The combined treatment process has the advantages of being capable of saving land occupation, optimizing flow process, fully utilizing terrain and geothermal resources, simplifying production management, and has obvious advantages on ensuring water quality of effluent water.