The Mangrove Wetland for Sewage Treatment

Summary

The present applied research aims to investigate the potential economic and ecological value of mangrove ecosystems and their conservation with the establishment of the 300-m2 constructed wetland for wastewater treatment and the Mangrove R & D Centre in Futian, Shenzhen. Our preliminary study showed that this mangrove system was able to effectively remove total suspended solids (TSS), TN, TP, NH4-N, PO4-P, BOD and COD. Based on our preliminary study, the removal rates of various pollutants are as follows: TSS 99%, TN 60~90%, TP 80~95%, NH4-N 70~90%, SP 90%, COD 40~80% and BOD 50~90%. The treatment efficiency varies with retention and flow patterns of the sewage, the minimum retention time is around 1 day for subsurface flow patterns. The constructed mangrove wetland, similar to or even better than conventional constructed wetlands, is a low-cost and effective approach for wastewater treatment, with many potential applications.

Technology Benefits

•	we have more than 20 years of experience in mangrove ecological and microbiological study, conservation and mangrove wetland-wastewater treatment;
•	our laboratory is equipped with the state-of-art facilities for scientific research, including a Hewlett-Packard gas chromatograph, Hitachi spectrophotometer, HACH water analysis workstation, etc.
•	we can provide our clients with a professional design of the constructed wetlands for wastewater treatment and perform a variety of water quality assays;
•	we are ready to transfer mangrove replanting technology;
•	the wetland project will become a display area of environmental conservation in Shenzhen for educating students and the public on the principles and effects of the new sewage treatment technology.

Technology Application

Water and wastewater treatment facilities, monitoring of environmental quality, environmental education, conservation of wetlands.

Country/Region

Hong Kong

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