Abstract
For typical wastewater treatment processes of urban sewage, plants are often noneffective to improve water qualities of lightly polluted domestic sewage, and urban constructed water quality treatment (WQT) wetlands designed with engineering landscape methods are utilized to optimize both water qualities and landscape values in recent years. The research determines the effects of two typical ecological engineering landscaping projects of urban constructed WQT wetlands by analysing their effects of wastewater quality improvements. Differences of water quality indicators (WQI) respectively among different treatment stages of wetlands includes surface flow wetland, vertical flow wetland, floating wetland islands etc., which have been measured and compared. Evaluation of urban constructed WQT wetlands engineering landscaping has been concluded based on comparisons among hydrological indicators and water quality indicators, i.e. pH, DO, NH3-N, CODCr, TP. Removal effects of individual indicators, includes NH3-N, CODCr and TP during different treatment stages have been quantitatively analysed. In accordance with quantitative analysis, benefits and deficiencies of practical landscape design of urban constructed WQT wetlands are concluded. By adapting proper principles in engineering landscaping, environmental and economic benefits can be achieved to create sustainable landscapes of urban constructed WQT wetlands.
Highlights
Even lightly polluted sewage discharged into an urban water supply may often contains toxic substances, which are likely to lead to eutrophication and usually fuel recurrent cyanobacterial blooms in most shallow and relatively small surface water bodies (Lürling & Mucci 2020), which fails to meet the requirements of ecological environment protection
According to different hydraulic forms, Constructed wetland (CW) can be divided into Free Water Surface (FWS) systems, Subsurface Flow (SSF) systems and Floating Wetland Islands (FWI), and SSF mainly includes Vertical Flow (VF) and Horizontal Flow (HF)
Hydrological and water quality indicators The details of the hydrological and water quality indicators of two constructed water quality treatment (WQT) wetlands are summarized in the Tables 3 and 4, which clearly indicate that after successive treatment function of constructed WQT wetlands, the water qualities have improved considerably
Summary
Water Science & Technology Vol 00 No 0, 2 to other types of common natural wetlands and artificial waterscapes; They can integrate physical, chemical, as well as biological treatment processes to carry out all stages (Acharya et al 2009), which can be more controlled and managed with the guidance of scientific strategies of water quality improvements. Urban constructed WQT wetlands can be adopted to remove low-concentration pollutants, minimize the pollution in waterbodies, and reduce biological toxicity. Small-scale constructed WQT wetland systems can be adopted as a supplement to practical processes of conventional urban sewage treatment, and water gone through the process can meet various types of water quality requirements for reusing, which can effectively maintain environmental qualities of urban water ecosystems
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
