Discuss how a constructed wetland system works to treat municipal wastewater. What advantages does a constructed wetland system have over conventional sewage treatment?

Discuss how a constructed wetland system works to treat municipal wastewater. What advantages does a constructed wetland system have over conventional sewage treatment? 

Your response must be at least 200 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced;