n Journal of Emerging Trends in Engineering and Applied Sciences - Effects of the physico-chemical characteristics of treated wastewater effluents on their reuse in plain concrete works

Volume 5, Issue 2
  • ISSN : 2141-7016
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The scarcity of water is fast becoming a critical environmental issue worldwide. Any effort targeted at conservation of this limited resources, preventing environmental degradation and thereby reducing water shortage, is worthwhile. This research therefore focused on the reuse of treated wastewater effluent in place of potable water in plain concrete production. The effects of the physico-chemical characteristics of this non-fresh water on the concrete strength were studied over time. Water samples were obtained from four sources which include: NMAM IT Nitte Campus potable water, Treated domestic sewage water, Service station water (Garage) and Dairy water. The samples were all analyzed for pH, total dissolved solids (TDS), chloride, hardness, alkalinity, and sulfates. Grade M20 concrete was adopted in the study. Physical tests conducted on the aggregates for the concrete mix include specific gravity, water absorption and sieve analysis. Plain cement concrete mixtures were prepared using Ordinary Portland Cement, graded aggregates and 100% substitution of treated wastewater for the mix. In all 12 concrete cubes were cast and cured for 3, 7 and 28 days. The mix ratios and compressive strengths of the cubes were determined using the Standard laboratory method of IS: 10262-2009. As compared with the USEPA and EU Standards, the general water pollution order observed was: Fresh water < Treatment Plant Effluent < Dairy water < Auto-Service effluent. The compressive strength result obtained from treated effluent showed an increase in 8.26 % for 28 days compared to fresh water. For garage water an increase in 5.14% was observed compared to freshwater. In general, there was no strength reversal with longer curing periods. However, for most concrete mixtures the strength tends to level off after one months of curing. Most production water mixtures resulted in higher strength measurements than those prepared using potable water. It was concluded that the physico-chemical parameters measured in the treated wastewater effluents had positively influence on the compressive strength of the plain concrete. From this study, it is believed that the recommended reuse of wastewater in plain concrete works will indirectly conserve the scarce water resources of the study area, as the regular sources would be concentrated on supply of drinking and other potable water usage.

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