Artificial wetland system with enhanced nitrogen removal function

Abstract

The invention discloses an artificial wetland system with enhanced nitrogen removal function. The system includes an aeration section artificial wetland and a non-aeration section artificial wetland, both the two section sections include tanks equipped with water inlets and water outlets, the tanks are internally filled with a packing, and plants are planted on the packing. The tank in the aeration section artificial wetland also internally includes a support layer, a water distribution system and an aeration system; the aeration section is connected to the non-aeration section through a connecting pipe fitting; one end of the connecting pipe fitting is connected to the water outlet of the aeration section artificial wetland, and the other end is connected to the water inlet of the non-aeration section artificial wetland. The non-aeration section artificial wetland also includes a plurality of perforated pipes filled with a degradable polymer as the solid phase carbon source so as to supplement insufficient carbon source for denitrification nitrogen removal. The invention adopts a technical scheme of combining two sections of artificial wetlands, the forepart aeration section artificial wetland is oxygenated by microaeration, and the rear non-aeration section artificial wetland is an anaerobic or anoxic environment, the two parts compose a system similar to AO process to strengthen the nitrogen removal effect. Also the system operates stably, and is not greatly affected by the climate.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to an artificial wetland system for strengthening denitrification. Background technique [0002] Constructed wetland technology, with its advantages of simple method and low investment, has developed rapidly in recent years. However, when constructing wetlands to treat low C / N (carbon / nitrogen) sewage, it has become a consensus that the removal effect of nitrogen and phosphorus is poor in the case of insufficient carbon sources. The existing solutions are mainly to add powdery or liquid organic carbon sources to the constructed wetland system, and to increase the carbon-nitrogen ratio of the influent by adding methanol, ethanol, glucose or fructose and other easily biodegradable organic matter into the influent. Promote denitrification and denitrification. There is also a method to directly transport untreated raw water at the middle end of the constructed wetland treatment process to ...

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Problems solved by technology

However, this method has the disadvantages of high infrastructure costs and its operation is greatly affected by the climate.

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