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Recycling 2016, 1(1), 3-13; doi:10.3390/recycling1010003

Recycled Shredded-Tire Chips Used As Support Material in a Constructed Wetland Treating High-Strength Wastewater from a Bakery: Case Study

1
Lagrange County Health Department, Environmental Health Office, 304 North Townline Road, Suite 1, LaGrange, IN 46761-1319, USA
2
Water Resources-Senior Associate, Lochmueller Group, 3502 Woodview Trace, Suite 150, Indianapolis, IN 46268, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Michele Rosano
Received: 4 August 2015 / Revised: 10 September 2015 / Accepted: 11 September 2015 / Published: 18 September 2015
View Full-Text   |   Download PDF [1051 KB, uploaded 21 December 2015]   |  

Abstract

Support material used in constructed wetlands has been shown to be a key element and significant mechanism in the process of contaminants removal from sewage including phosphorus compounds. Recycled waste tires processed into small chips that are similar to conventional stone aggregate are currently used in the construction of septic system leach fields and could be a green alternative as support material in constructed wetlands. During three years, the performance of a gravity subsurface horizontal flow constructed wetland using recycled shredded-tire chips as support material to treat on-site the high strength wastewater from a bakery was monitored. Grab samples of the effluent from the septic tank and the constructed wetland were collected quarterly and submitted to a certified laboratory. Final treatment efficiency (percentage removal) was low for potassium (36%), intermediate for total nitrogen (56%), and total Kjeldahl nitrogen (57%), and relatively high for total phosphorus (65%), total suspended solids (69%), ammonia-nitrogen (87%), five-day biochemical oxygen demand (92%), Escherichia coli (97%), and fat-oil and grease total (99%). Nitrate-nitrogen final mean value was consistently below 1 mg/L, and iron concentration increased from less of 2 mg/L in the sewage to 55 mg/L in the constructed wetland effluent. These results show that recycled shredded-tire chips could be an environmental alternative support material in constructed wetlands as efficient removal of typical wastewater contaminants is not compromised. View Full-Text
Keywords: constructed wetland; high-strength sewage; recycled tires; shredded-tire chips constructed wetland; high-strength sewage; recycled tires; shredded-tire chips
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

García-Pérez, A.; Harrison, M.; Chivers, C.; Grant, B. Recycled Shredded-Tire Chips Used As Support Material in a Constructed Wetland Treating High-Strength Wastewater from a Bakery: Case Study. Recycling 2016, 1, 3-13.

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