Ecological Wisdom-Inspired Remediation Technology for Aquaculture Water Quality Improvement in Ecological Agricultural Park

Abstract

The current ecological situation of aquaculture water quality in Wushe (Songjiang District, Shanghai City) District is not up to the mark: In the present study, characteristics and basic information of ecological agricultural park were first investigated. Ecological remediation integration technology, including aquatic plant purification and aquatic economic crops floating bed, was used to improve the aquaculture water quality in this district. After operating for a period of defined time, effects of the integration technology on quality improvement in the aquaculture water quality at experimental site with removal rates of CODCr, TN, and TP were 73.5%, 24.9%, and 67.4%, respectively. In addition, the purification effects of ecological remediation integration technology and individual technology were compared. The results indicated that the integration technology was better than individual technology, as TN, TP, nitrite nitrogen, and CODCr were removed at the rate of 13.7%, 40.1% 78.7%, and 114.4%, respectively, higher than that of individual technology. In addition, water spinach, which was grown on aquatic economic crops floating bed, was harvested at regular time intervals. The total harvest weight of water spinach was 11907 kg, which could achieve good economic benefits. A small parts of the water spinach were transplanted to crab ponds. The transplanted water spinach could not only serve as food source for crab, but also purify the water quality in crab ponds, which could maintain the biological diversity in aquacultural ponds and coincide with production mode of circulation ecological agriculture .