First, the use of
HR-AO series of integrated wastewater treatment equipment using the  advanced biological treatment process, set to remove BOD5, COD, NH3N in one, is currently the  efficient sewage treatment equipment. It is widely used in high-grade hotels, villas, hospital wastewater and residential areas, a comprehensive sewage treatment, to replace the removal rate is low, the treated effluent can not reach the national integrated discharge standard septic tanks. The practical application shows that the HR-AO series integrated wastewater treatment equipment is a kind of equipment which has a very good effect and convenient management.
Two, working principle

HR-AO series integrated wastewater treatment equipment to remove organic pollutants and ammonia nitrogen is mainly dependent on the AO biological treatment process. The working principle is the A-class, due to the high concentration of sewage organic matter, microorganisms in the lack of gas state, when microorganisms for facultative microorganisms, they will waste water of organic ammonia decomposition and transformation for NH3-N, at the same time to use organic carbon as an electron donor, no - 2-N, no - 3-N turn to N2, but also the use of part of the organic carbon source and NH3 synthesis of new cell material. So the A-class pool not only has certain organic matter removal function, reduce the organic load of subsequent aerobic pool, to nitrification, and rely on the raw water in the presence of high concentration of organic matter, complete denitrification, the eventual elimination of nitrogen eutrophication pollution. At O level, due to the organic matter concentration has been greatly reduced, but there is still a certain amount of organic matter and a higher NH3-N presence. In order to make the organic matter to be further oxidized and decomposed, at the same time, the nitrification function can be carried out smoothly in the process of carbonization, and the aerobic biological contact oxidation pool with low organic loading in the O stage is arranged. In the O pool is the main aerobic bacteria and aerobic bacteria (nitrification bacteria). The aerobic microorganisms will be organic matter decomposed into CO2 and H2O; autotrophic bacteria (Nitrosomonas) by organic matter decomposition of inorganic carbon or air CO2 as a nutrient source, sewage in the NH - 3-N into n 2-ON n - 3-ON, O level pool water flow back to class a pool, grade a pool provide electron acceptor. Through denitrification with eventual elimination of nitrogen pollution.

Three, equipment technical parameters

Model project	HR-AO-3	HR-AO-5	HR-AO-10	HR-AO-15	HR-AO-20	HR-AO-25	HR-AO-30	HR-AO-50
The standard processing capacity (m³/hr)	3	5	10	15	20	25	30	50