Application of a combined three-stage system for reclamation of tunnel construction wastewater

Environmental Technology
Jong-Oh KimYoung Mo Kim

Abstract

A combined three-stage system, (1) coagulation (2) zeocarbon filtration and (3) membrane filtration, a combination of microfiltration (MF) and reverse osmosis (RO), was investigated for reclamation of tunnel construction wastewater having a salinity of 10.8-12.9‰ and a concentration of suspended solids (SS) in the range of 264-1084 mg/L. The initial stages - coagulation, zeocarbon filtration and MF - served as a precursor to RO membrane filtration to successfully reduce water contaminants to less than 0.2 nephelometric turbidity units (NTU) of turbidity, thereby minimizing the potential for fouling. The RO system subsequently removed over 99% of remaining pollutants including ionic substances, resulting in less than 0.02 NTU turbidity, less than 0.04 mg/L total nitrogen (TN) and less than 0.01 mg/L total phosphorus (TP). Also, addition of an RO system markedly reduced high salt concentrations (high chloride (Cl(-)) concentrations) in the wastewater, exceeding 99% salt elimination. Thus, reclaimed water from our combined system met and exceeded currently regulatory quality standards for wastewater reuse (turbidity ≤ 2.0 NTU; TN ≤ 10 mg/L; TP ≤ 0.5 mg/L; Cl(-) ≤ 250 mg/L).

References

Aug 2, 2001·Environmental Science & Technology·S Lee, R M Lueptow
Sep 7, 2002·Environmental Science & Technology·Kerry J Howe, Mark M Clark
Feb 14, 2006·Journal of Hazardous Materials·Yuqiu WangTan Zhu
Mar 25, 2008·Journal of Hazardous Materials·Hong ZhengShuping Liang
Jul 9, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Pauline D JohnsonJason Kirby
May 11, 2012·Environmental Science and Pollution Research International·Vinod Kumar GuptaShilpi Agarwal
Jul 9, 2014·Advances in Colloid and Interface Science·Tawfik A Saleh, Vinod Kumar Gupta

❮ Previous
Next ❯

Methods Mentioned

BETA
membrane filtration

Related Concepts

Related Feeds

Blood Clotting Disorders

Thrombophilia includes conditions with increased tendency for excessive blood clotting. Blood clotting occurs when the body has insufficient amounts of specialized proteins that make blood clot and stop bleeding. Here is the latest research on blood clotting disorders.