NOVELTY - Treatment of municipal solid wastes comprises pre-treatment of municipal solid wastes; feeding wastes into gasification furnace, making enriched oxygen as gasification medium, imperfectly burning wastes in short of oxygen, and making gasification reaction to produce combustible gas; introducing combustible gas into purification system to purify, and removing ash and tar from fuel and storing into gas cabinet; recirculating the gasified gas; and undergoing sewage treatment and energy conservation by extracting gas from waste pit and introducing tail gas into rotary kiln to dry wastes.    USE - Method for treating municipal solid wastes.    ADVANTAGE - For the oxygen-enriched condition, little nitrogen enters the reactor, so little nitric oxide is produced in the reaction which is helpful to subsequent purification and secondary pollution is reduced. Compared with the traditional combustion product, the combustion product from oxygen-enriched pyrogenic decomposition and gasification has no nitrogen, which takes up 60% of the total amount. The oxygen-enriched pyrogenic decomposition and gasification technology has low heat loss, which is half of that produced in the original combustion. The clinkers produced can be applied to paving or building industry. No harmful gas such as dioxide, no wastewater and no dust are exhausted. It is unnecessary to classify the wastes during treatment of municipal solid wastes, without other fuels except the wastes.    DETAILED DESCRIPTION - Treatment of municipal solid wastes comprises:    (A) storing municipal solid wastes into a waste pit, crushing, sieving, squeezing and transmitting the wastes into a rotary kiln to dry and dehydrate; and controlling the water content at 25%;    (B) feeding the pre-treated municipal solid wastes into a gasification furnace through a feeding machine; making the enriched oxygen as gasification medium; then imperfectly burning the wastes in gasification furnace in short of oxygen; and making gasification reaction to produce combustible gas;    (C) introducing combustible gas into a purification system to purify, which is composed of a Venturi and at least two-stage water scrubber; and removing the ash and tar from the fuel and then storing it into a gas cabinet;    (D) recirculating the gasified gas; and    (E) entrapping greater impurities and floater from the percolate obtained in step (A) and (B) through grizzly screens and then flowing the solution into a sewage regulation pool; draining water from sewage regulation pool and sending to a coagulating sedimentation gas floating pool via a pump; introducing the drained water to an anaerobic hydrolysis acidification tank; using a pump to drain water from hydrolysis acidification tank to the anaerobic treatment stage; extracting the gas from the waste pit through a pump; directly outputting the gas to the gasification furnace; producing heat steams in the process of washing in a first-stage washing tower and then supplying the heat to the rotary kiln to dry the wastes by a heat changer; and then introducing the tail gas after combustion in the internal-combustion engine into the rotary kiln to dry wastes.    DESCRIPTION OF DRAWING(S) - The drawing is a block diagram of a method for treating municipal solid wastes through oxygen-enriched gasification (Drawing includes non-English language text).