Energy-saving efficient denitrification type subsurface wetland process

• Main Authors: ZHENG CHEN, CHEN JIANFEI, YANG WEI, DUAN CHANGBING, XIAO LEI
• Format: Patent
• Language: Chinese; English
• Published: 07.06.2022
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses an energy-saving efficient denitrification type subsurface flow wetland process which comprises the following steps: (1) after original urban domestic sewage enters a first subsurface flow wetland, firstly absorbing and utilizing organic matters in the sewage by aquatic plants, and then adjusting aeration time and dissolved oxygen in the first subsurface flow wetland to control a nitrification process, maintaining the ratio of ammoniacal nitrogen to nitrite nitrogen in the effluent to be 1: (1.2-1.3); (2) enabling effluent in the step (1) to enter a second subsurface flow wetland, removing nitrogen on the upper layer in the second subsurface flow wetland by using a second filler layer, and carrying out deep purification treatment on ammonia nitrogen and other pollutants which are not completely biochemically removed on the lower layer by using a third filler layer; and (3) using the effluent in the step (2) as municipal miscellaneous water, recreational landscape water or agricultural