Tangxi River receives effluents from several wastewater treatment plants (WWTPs), which need additional treatment to meet the more stringent standards for discharge into this river. A field-scale sequential hybrid constructed wetland (SHCW) system comprising of ecological floating beds with biofilms, zeolite filter beds, facultative pond, and an ecological pond with submerged plants was built for the improvement of the effluent quality. SHCW exhibited significant removal efficiency of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), and total phosphorus (TP) with average monthly removal efficiency of 72.52% ± 3.89%, 91.58% ± 3.12%, and 76.29% ± 8.15%, respectively, during the survey period. After treatment, the final concentration of COD, NH4+-N, total nitrogen (TN), and TP in the effluent was 13.75 ± 0.51, 0.39 ± 0.03, 11.89 ± 0.51, and 0.09 ± 0.05 mg/L, respectively. Moreover, the treatment units showed seasonal variations in COD, NH4+-N, TN, and TP removal efficiency, and summer was the best season for pollutant removal. The treatment cost of SHCW was estimated to be 0.29 RMB/m3 ($0.044/m3), which makes it a cost-effective, feasible, and favorable environmental treatment method for the improvement of treated wastewater. Therefore, WWTPs are recommended to be accompanied with SHCW to achieve acceptable effluent quality and provide a better environment.
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References
1.
AlmuktarS.A.A.A.N., AbedS.N., and ScholzM. (2018). Wetlands for wastewater treatment and subsequent recycling of treated effluent: A review. Environ. Sci. Pollut. Res. 25, 23595.
2.
APHA. (2017). Standard Methods for the Examination of Water and Wasterwater (23rd ed). Washington, DC: American Public Health Association, American Water Works Association, Water Environment Federation.
3.
BiR., ZhouC., JiaY., WangS., LiP., ReichwaldtE.S., and LiuW. (2019). Giving waterbodies the treatment they need: A critical review of the application of constructed floating wetlands. J. Environ. Manage. 238, 484. https://doi.org/10.1016/j.jenvman.2019.02.064
ChangJ.J., WuS.Q., DaiY.R., LiangW., and WuZ.B. (2013). Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems. Ecol. Eng. 58, 192.
6.
ChenW., LuS., JiaoW., WangM., and ChangA.C. (2013). Reclaimed water: A safe irrigation water source? Environ. Dev. 8, 74.
7.
ChenZ.M., ChenB., ZhouJ.B., LiZ., ZhouY., XiX.R., LinC., and ChenG.Q. (2008). A vertical subsurface-flow constructed wetland in Beijing. Commun. Nonlinear Sci. Numer. Simul. 13, 1986.
8.
EkeP.E., and ScholzM. (2008). Benzene removal with vertical-flow constructed treatment wetlands. J. Chem. Technol. Biotechnol. 83, 55.
9.
FechnerL.C., VersaceF., Gourlay-FranceC., and Tusseau-VuilleminM.H. (2012). Adaptation of copper community tolerance levels after biofilm transplantation in an urban river. Aquat. Toxicol. 106, 32.
10.
HaberlR. (1999). Constructed wetlands: A chance to solve wastewater problems in developing countries. Water Sci. Technol. 40, 11.
11.
HadadH.R., and MaineM.A. (2007). Phosphorous amount in floating and rooted macrophytes growing in wetlands from the Middle Parana River floodplain (Argentina). Ecol. Eng. 31, 251.
12.
HaoX., WangX., LiuR., LiS., van LoosdrechtM.C.M., and JiangH. (2019). Environmental impacts of resource recovery from wastewater treatment plants. Water Res. 160, 268.
13.
Hijosa-ValseroM., MatamorosV., Sidrach-CardonaR., Martín-VillacortaJ., BécaresE., and BayonaJ.M. (2010). Comprehensive assessment of the design configuration of constructed wetlands for the removal of pharmaceuticals and personal care products from urban wastewaters. Water Res. 44, 3669.
14.
HuangJ.P., and WuL.Y. (2008). Standard Implementation Guide for Urban Sewage Recycling. Beijing: Standards Press of China.
15.
JehawiO.H., AbdullahS.R.S., KurniawanS.B., IsmailN.I., IdrisM., Al SbaniN.H., MuhamadM.H., and HasanH.A. (2020). Performance of pilot Hybrid Reed Bed constructed wetland with aeration system on nutrient removal for domestic wastewater treatment. Environ. Technol. Innovation. 19, 100891.
16.
JiaW.L., ZhangJ., LiP.Z., XieH.J., WuJ., and WangJ.H. (2011). Nitrous oxide emissions from surface flow and subsurface flow constructed wetland microcosms: Effect of feeding strategies. Ecol. Eng. 37, 1815.
17.
JoshuaP.B., BarthF.S., BruceE.R., MarkC.M., vanL., EberhardM., and GlenT.D. (2017). From biofilm ecology to reactors: A focused review. Water Sci. Technol. 75, 1753.
18.
JuanicoM., and FriedlerE. (1999). Wastewater reuse for river recover in semiarid Israel. Water Sci. Technol. 40, 43.
19.
KengT.S., SamsudinM.F.R., and SufianS. (2021). Evaluation of wastewater treatment performance to a field-scale constructed wetland system at clogged condition: A case study of ammonia manufacturing plant. Sci. Total Environ. 759, 143489.
20.
KivaisiA.K. (2001). The potential for constructed wetlands for wastewater treatment and reuse in developing countries: A review. Ecol. Eng. 16, 545.
21.
LangergraberG., and HaberlR. (2001). Constructed wetlands for water treatment. Minerva Biotecnologica. 13, 123.
22.
LiangK., DaiY., WangF., and LiangW. (2017). Seasonal variation of microbial community for the treatment of tail water in constructed wetland. Water Sci. Technol. 75, 2434.
23.
LiangM., WangT., LiY., YangP., LiuC., LiP., and ZhaoW. (2013). Structural and fractal characteristics of biofilm attached on the surfaces of aquatic plants and gravels in the rivers and lakes reusing reclaimed wastewater. Environ. Earth Sci. 70, 2319.
24.
LinY.F., JingS.R., WangT.W., and LeeD.Y. (2002). Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands. Environ. Pollut. 119, 413.
25.
LiuC., ShaoS., ShenQ., FanC., ZhouQ., YinH., and XuF. (2015). Use of multi-objective dredging for remediation of contaminated sediments: A case study of a typical heavily polluted confluence area in China. Env. Sci. Pollut. Res. 22, 17839.
26.
LiuD., GeY., ChangJ., PengC., GuB., ChanG.Y.S., and WuX. (2009). Constructed wetlands in China: Recent developments and future challenges. Front. Ecol. Environ. 7, 261.
27.
LyuS., ChenW., ZhangW., FanY., and JiaoW. (2016). Wastewater reclamation and reuse in China: Opportunities and challenges. J. Environ. Sci. 39, 86.
28.
ManninoI., FrancoD., PiccioniE., FaveroL., MattiuzzoE., and ZanettoG. (2008). A cost-effectiveness analysis of seminatural wetlands and activated sludge wastewater-treatment systems. Environ. Manage. 41, 118.
PapaevangelouV., GikasG.D., and TsihrintzisV.A. (2016). Effect of operational and design parameters on performance of pilot-scale vertical flow constructed wetlands treating university campus wastewater. Water Resour. Manage. 30, 5875.
33.
PengY.Z. (2019). Curbing the trend of blindly raising the discharge standard of municipal sewage treatment to the class IV or III of the national surface water quality standards. China Water Wastewater. 35, T1.
34.
RugaikaA.M., KajunguriD., Van DeunR., Van der BruggenB., and NjauK.N. (2019). Mass transfer approach and the designing of horizontal subsurface flow constructed wetland systems treating waste stabilisation pond effluent. Water Sci. Technol. 78, 2639.
35.
SaeedT., HaqueI., and KhanT. (2019). Organic matter and nutrients removal in hybrid constructed wetlands: Influence of saturation. Chem. Eng. J. 371, 154.
36.
SaundersD.L., and KalffJ. (2001). Nitrogen retention in wetlands, lakes and rivers. Hydrobiologia. 443, 205.
37.
ScholesL., FaulknerH., TapsellS., and DownwardS. (2008). Urban rivers as pollutant sinks and sources: A public health concern for recreational river users? Water Air Soil Pollut. Focus, 8, 543.
38.
ShengY., QuY., DingC., SunQ., and MortimerR.J.G. (2013). A combined application of different engineering and biological techniques to remediate a heavily polluted river. Ecol. Eng. 57, 1.
39.
SmithK., GuoS., ZhuQ., DongX., and LiuS. (2019). An evaluation of the environmental benefit and energy footprint of China's stricter wastewater standards: Can benefit be increased? J. Cleaner Prod. 219, 723.
TianzhiW., YunkaiL., MingchaoL., PeilingY., and ZhihuiB. (2014). Biofilms on the surface of gravels and aquatic plants in rivers and lakes with reusing reclaimed water. Environ. Earth Sci. 72, 743.
43.
TilleyE., UlrichL., LuethiC., ReymondP., and ZurbrueggC. (2014). Compendium of Sanitation Systems and Technologies, 2nd Revised Edition. Duebendorf, Switzerland: Swiss Federal Institute of Aquatic Science and Technology (Eawag).
44.
VymazalJ. (2007). Removal of nutrients in various types of constructed wetlands. Sci. Total Environ. 380, 48.
45.
WangX., DaiggerG., de VriesW., KroezeC., YangM., RenN.Q., LiuJ.X., and ButlerD. (2019). Impact hotspots of reduced nutrient discharge shift across the globe with population and dietary changes. Nat. Commun. 10, 12.
46.
WangX.H., WangX., HuppesG., HeijungsR., and RenN.Q. (2015). Environmental implications of increasingly stringent sewage discharge standards in municipal wastewater treatment plants: Case study of a cool area of China. J. Cleaner Prod. 94, 278.
47.
YangY., LiuJ., ZhangN., XieH., ZhangJ., HuZ., and WangQ. (2019). Influence of application of manganese ore in constructed wetlands on the mechanisms and improvement of nitrogen and phosphorus removal. Ecotoxicol. Environ. Saf. 170, 446.
48.
ZhangQ.H., YangW.N., NgoH.H., GuoW.S., JinP.K., DzakpasuM., YangS.J., WangQ., WangX.C., and AoD. (2016). Current status of urban wastewater treatment plants in China. Environ. Int. 92, 11.
49.
ZhuL., LiuB., WangF., and BiJ. (2013). Raising discharge standards leads to environmental problem shifting in China. Water Sci. Technol. 68, 2605.
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