Effects of a Combined Biological Restoration Technology on Nitrogen and Phosphorus Removal from Eutrophic Water

Abstract

Eutrophication resulting from high nutrient load has been a major environmental issue worldwide. Many biological restoration methods have been developed to remedy eutrophic waterbodies [1-2]. Among them, stocking planktivorous fish such as filter-feeding silver carp or bighead carp, has been proved to be effective in controlling blue-green algae blooms [3]. And introducing filter-feeding bivalves into water is also applied to control algal overgrowth [4]. In addition, the replanting of submerged macrophytes is often used to stabilize the clear-water state [5][6]. However, many unsuccessful attempts have suggested that using only a single biomanipulation measure fails to reduce internal nutrient load sufficiently, which results in a high probability that the site will return to a turbid state some years after successful restoration [7][8][9]. For example, stocking filter-feeding fish or bivalves will promote the nutrient release from sediment into the water [10][11]. In addition, the grazing effects of silver carp or bivalves could promote the miniaturization of

Examining the Purification Effect of Euryale Ferox On Eutrophic Rivers Along the Huaihe River

“…China possesses a bountiful reserve of indigenous aquatic plants, noted for their abundant resources [21], with high ecological safety and water purification capacity. For example, the yellow-flowered water dragon, a native plant, exhibits an impressive removal rate of approximately 60% for total nitrogen in polluted water [35], which is 2.6 and 2.9 times that of water hyacinth and water peanut, respectively. Similarly, its removal rate for total phosphorus was approximately 25%, exceeding that of water hyacinth and water peanut by 0.7 and 1.9 times, respectively.…”