NDLI: Utilization of fine powder in demolition concrete as recyclable coagulant in removing color from dye-bearing wastewater

Content Provider	Springer Nature Link
Author	Chen, Quanyuan Lan, Qing Li, Xinyin Zhou, Juan Yang, Zaifu Zhou, Yasu
Copyright Year	2015
Abstract	The fine powders in demolition concretes with Portland cement, high alumina cement or white silicate cement as binders were used as coagulants to treat wastewater containing disperse red S-GR (typical hydrophobic dye) or reactive brilliant blue X-BR (typical hydrophilic dye). The efficiency in removing a color from wastewater was examined at varying contact time, dosage and regeneration cycles. In addition, the coagulation sludge was characterized by thermal analyses and X-ray diffraction technique for recycling. High alumina cement can coagulate both dyes at a relative low dosage of 2–3 g/L, but regeneration performance was poor. The coagulation with white silicate cement reached a color removal of 98 % for disperse red S-GR at a dosage of 6 g/L and 90 % for reactive brilliant blue X-BR at a dosage of 18 g/L. Portland cement showed a rapid coagulation rate and >95 % color removal for both dyes even after seven cycles of coagulation and sludge calcination. The dosage of the coagulant required for active brilliant blue X-BR coagulation (10 g/L) was much higher than that for disperse red S-GR coagulation (2.5 g/L). It is concluded that Portland cement can be used as a recyclable coagulant in the treatment of dye-bearing wastewater.
Starting Page	6737
Ending Page	6745
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coagulant Recycling Demolition concrete Dyeing wastewater Sludge Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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