Abstract
The treatment of polluted water and sediment often costs too much and has little benefit. In this study, we proposed a novel design using dredged sediment, shrub willow (Salix spp.) and recirculating hand pumps for the restoration of polluted river water in Changchun city, China. Sediment was filled as a matrix for plant growth, shrub willow was transplanted for the absorption of nutrients, and ten hand-pumped water wells were built for recycling the polluted water. During the 5-month experimental period, the shrub willow growth and nutrient contents, sediment nutrient concentration and water quality were measured. The results showed that this pond system could effectively decrease the sediment pollutant levels, and its removal efficiencies of organic matter (OM), total nitrogen (TN) and total phosphorus (TP) could respectively reach as high as 11%, 10% and 26%. The dissolved oxygen (DO) content increased by more than 90% in August, and the chemical oxygen demand (COD) and total nitrogen (TN) content decreased by 44.93% and 19.82%, respectively. This means that the treatment pond could efficiently work toward the purification of polluted river water. The benefits and feasibility of this system application were also analyzed, and we found that it could be widely used for the treatment of polluted water and sediment in urban areas.
Highlights
The eutrophication of waterbodies from nutrient-rich sediment and water is a common problem for freshwater bodies in urban areas
The dissolved oxygen (DO) content increased by more than 90% in August, and the chemical oxygen demand (COD) and total nitrogen (TN) content decreased by 44.93% and 19.82%, respectively
Considering the characteristics of water pollution in the urban area surrounding the Yitong River in China, including eutrophication, stagnation, reduced vegetation in the riparian buffer and high sediment treatment costs, we proposed a novel water treatment pond filled with dredged sediment and planted with shrub willow (Salix spp.), with hand-pumped water wells that force water from the bottom of the pond into the bankside willow system
Summary
The eutrophication of waterbodies from nutrient-rich sediment and water is a common problem for freshwater bodies in urban areas. Many best management practices (BMPs) have been developed to treat these impaired waters, including the use of a pond system, artificial floating islands, contact oxidation and biomanipulation techniques [1,2,3,4]. Stormwater ponds are a common practice to improve water quality in urban landscapes. In the USA, sediment dredging and retrofitting retention ponds decrease the impairment of rivers [7]. These methods have improved water quality to some extent, they
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
