Open AccessStudy on the purification of aquaculture wastewater by the compound wetland ecosystem
Author(s) -
Jiangqi Qu,
Cheng-xia Jia,
Qingjing Zhang,
Pan Liu,
Mu Yang,
Meng Zhao
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/514/5/052023
Subject(s) - wetland , environmental science , aquaculture , wastewater , constructed wetland , ecosystem , water quality , ditch , portable water purification , sewage treatment , environmental engineering , environmental chemistry , ecology , fishery , chemistry , biology , fish <actinopterygii>
Traditional freshwater aquaculture can easily cause serious environmental problems and waste of water resources. Thus, ecological bioremediation techniques for freshwater pond environments are more attractive. In this study, a set of compound wetland ecological system with ecological ditch, constructed wetland and multi-functional ecological pond was constructed, and its purification effect was also evaluated. Our results showed that the compound wetland ecosystem has high removal efficiency for aquaculture wastewater. The concentration of total nitrogen, ammonia nitrogen, Nitrite Nitrogen, total phosphorus, and chlorophyll-a in each treatment unit gradually decreased after the system was stabilized. The annual average removal rates of TN, NH 4 + -N, NO 2 − -N, TP and Chl-a can reach 73.03%, 74.27%, 91.89%, 64.29% and 83.02%. We found ammonia nitrogen concentration was significantly biodegraded (p <0.05) by the ecological ditch, as well as constructed wetland and multi-functional ecological purification pond had obvious removal effect on TN, TP, NH 4 + -N, NO 2 − -N, and Chl-a (p <0.05). Moreover, the concentrations of pollutants after purification were lower than the standard value of fishery aquaculture water quality in China, and the purified water was recycled to fish ponds for reuse. Therefore, the compound wetland ecosystem can be adopted by the water shortage area to develop water-saving fisheries in the future.