Double-layer subsurface-flow constructed wetland system used for sewage treatment in medium and small towns of cold areas and operation method thereof

• Main Authors: PANG CHANGLONG, MA FANG, XU SHANWEN, QIU SHAN
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2012
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a double-layer subsurface-flow constructed wetland system used for sewage treatment in medium and small towns of cold areas and belongs to the field of sewage treatment engineering. The constructed wetland system comprises a water distribution regulating tank at one side of a tank body, an outlet water collecting tank at the other side of the tank body, an upper-layer wetland and a lower-layer wetland in the tank body, a water distribution pipe supplying water for the upper-/lower-layer wetlands, and an outlet water collecting pipe after treatment, wherein the upper-layer wetland and the lower-layer wetland are both subsurface-flow constructed wetlands and are separated by a waterproof interlayer, the lower part of the upper-layer wetland is filled with the composite filler of ceramsite and coal cinder, the upper part of the upper-layer wetland is filled with the composite filler of ceramsite, coal cinder and soil, aquatic plants are planted on the surface of the composite filler of t