Abstract
“The Hebei Xiongan New Area Planning Outline” states that the carbon sink of the water body should be improved and the quality of Baiyangdian water should be improved by cleaning the sludge, but the treatment of endogenous pollution in the water body will release a large amount of carbon dioxide, which will reduce the carbon sink of Baiyangdian, which makes the improvement of water body quality and increasing carbon sink conflicting. In order to realize the coordinated development of Baiyangdian water quality improvement and carbon sink increase, this paper establishes the calculation model of the amount of sludge to be cleared to improve the unit water quality and the amount of carbon dioxide released by clearing the silt using the release flux and diffusion flux of nitrogen and phosphorus elements in the water body, and the relationship between the content of nitrogen and phosphorus elements, the depth of Baiyangdian sludge excavation and the amount of carbon dioxide released: as the content of nitrogen and phosphorus elements in the water decreases, the depth of sludge excavated to improve the unit water body increases, and the amount of carbon dioxide released gradually increases. As the nitrogen and phosphorus content in the water decreases, the depth of dredged sludge to improve the quality of the water body increases, the carbon dioxide released gradually increases, and when the nitrogen and phosphorus concentration reaches 0.18 g/m3 and 0.6 g/m3 respectively, the carbon dioxide released will increase exponentially. Thus, we propose countermeasures to improve the water quality of Baiyangdian and increase the carbon sink capacity: we can improve the water quality by reasonable dredging before the water quality reaches poor category 3; we can achieve the dual goals of improving the water quality and increasing the carbon sink by increasing the reed planting area.
Highlights
Baiyangdian is located in Baoding City, Hebei Province, with a longitude of 115◦45 –116◦07 E and a latitude of 38◦44 –38◦59 N
“Hebei Xiong’an New District Planning Outline” pointed out that the scope of dredging should be reasonably delineated, the ecological dredging of the lake should be realized scientifically and orderly, the internal pollution should be eliminated, the ecological environment of aquatic animals at the bottom of the water body should be repaired, the environmental quality of the lake should be improved, and the water quality of Baiyangdian should be gradually restored to III-IV category [1]
The dredging and cleaning of eutrophic algae and other operations to eliminate endogenous pollution to improve water quality will reduce the content of nitrogen, phosphorus and other polluting elements in the water while re-emitting their fixed carbon into the air, increasing carbon emissions, and reducing carbon sinks in the sediment, which is inconsistent with the goal of improving carbon sink capacity. [3]
Summary
Baiyangdian is located in Baoding City, Hebei Province, with a longitude of 115◦45 –116◦07 E and a latitude of 38◦44 –38◦59 N. At the end of 2018, Xiong’an New Area had completed the treatment of livestock and poultry breeding, domestic waste cleaning and renovation in Dianzhong village and dianbian village, garbage cleaning politics within two kilometers on both sides of the river, treatment of industrial wastewater discharge standard, industrial solid waste and hazardous waste cleaning and renovation, toilet renovation of Dianzhong village and dianbian village, and upgrading of sewage treatment plant, etc., which is expected to be further improved The water quality of Baiyangdian Lake needs to start from the direction of internal pollution control. Fish feces and aquatic organism corpses sink into the sediment by sedimentation, making the sludge become an important storage reservoir for elements such as nitrogen and phosphorus in the Baiyang Lake water body [2]. Cleaning the sludge in the lake is one of the effective ways to improve the quality of the water body
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