A nitrification/partial denitrification/ANAMMOX coupling process method for treating low c/n urban sewage

Abstract

The invention provides a method for treating municipal wastewater with a low C / N ratio by adopting a nitrification / partial denitrification / anaerobic ammonium oxidation coupling technology, and belongs to the field of wastewater treatment. The device comprises a raw water tank and a nitrification / partial denitrification / anaerobic ammonium oxidation reactor; the method comprises the following steps: municipal domestic wastewater enters the nitrification / partial denitrification / anaerobic ammonium oxidation reactor in multiple steps, each time after a certain amount of wastewater enters the reactor, the wastewater is stirred under an anaerobic condition for a certain period of time, so that incomplete denitrification and anaerobic ammonium oxidation reaction can be carried out, then aeration is carried out for aerobic nitrification reaction, a certain amount of municipal wastewater with a low C / N ratio is pumped again into the reactor, the wastewater is stirred under an anoxic condition and subjected to aerobic nitrification, and finally total nitrogen in the domestic wastewater can be efficiently removed.

Description

Technical field [0001] The invention relates to a method for treating low C / N urban sewage by a nitrification / partial denitrification / anaerobic ammonia oxidation coupling process, which belongs to the technical field of sewage biological treatment, and in particular, the urban domestic sewage enters the nitrification / partial denitrification / anammox process multiple times. In the oxygen ammonia oxidation reactor, each time the sewage is pumped, it is anoxic and stirred for a period of time to perform incomplete denitrification and anaerobic ammonia oxidation, followed by aeration for aerobic nitrification, and finally achieve high efficiency of total nitrogen in domestic sewage Remove. The invention makes full use of carbon sources in domestic sewage, has low sludge yield, simple and easy-to-control process, and is a new way to treat low-C / N urban sewage with low energy consumption, high efficiency and stability. Background technique [0002] In recent years, the degree of eutrop...

AI Technical Summary

Problems solved by technology

The short-cut nitrification process is mainly realized by controlling dissolved oxygen, temperature, pH or the inhibition of free ammonia, but the biggest problem facing short-cut nitrification is to obtain sufficient and stable nitrite accumulation

For urban domestic sewage with a low carbon-to-nitrogen ratio, short-cut nitrification at room temperature is difficult to maintain stability, resulting in low efficiency of subsequent anammox denitrification and complicated control process, which also limits the application of short-cut nitrification-anammox technology in cities sewage bottleneck

Images