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Molecular weight-fractionation characteristics and coagulation behaviors of bio-recalcitrant dissolved organic matter and colorants in cassava distillery wastewater Yu Chen, Ming Zhang, Li Xie, Zhou Wang, and Qi Zhou Ind. Eng. Chem. Res., Just Accepted Manuscript • DOI: 10.1021/acs.iecr.8b00287 • Publication Date (Web): 07 Mar 2018 Downloaded from http://pubs.acs.org on March 7, 2018
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Industrial & Engineering Chemistry Research
Molecular weight-fractionation characteristics and coagulation behaviors of bio-recalcitrant dissolved organic matter and colorants in cassava distillery wastewater
Yu Chen†, Ming Zhang*,†,‡, Li Xie*,†, Zhou Wang†, Qi Zhou†
†
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory
of Yangtze River Water Environment, Institute of Biofilm Technology, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China ‡
College of Environment, Zhejiang University of Technology, Hangzhou 310014,
China
Corresponding author: *Ming Zhang, E-mail address:
[email protected]. Phone: +86 15824122236. *Li Xie, E-mail address:
[email protected]. Tel: +86 021 65982689.
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Industrial & Engineering Chemistry Research 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Abstract
The bio-recalcitrant dissolved organic matter (DOM) and colorants in the bio-chemically treated effluent, featured as their complex and indefinite composition, are drawing an increasingly environmental concern in the distillery industry. The current study focuses on the evaluation of the hard DOM and colorants based on their molecular weight fractionation, which facilitates the colorant identification and the mechanism exploration in the subsequent coagulation process. It was found that the DOM was distributed most in the MW range of 1-5 kDa whereas least in the MW below 1 kDa; and the fluorescent components in the bio-chemically treated distillery wastewater mainly distributed in low MW (100, 10-100, 5-10 and 1-5 kDa were obtained by collecting the concentrate above the membranes of 100, 10, 5 and 1kDa cut-off, named Fr-100, Fr-10, Fr-5 and Fr-1, respectively; and the MW fraction below 1 kDa was the filtrate of 1 kDa membrane, named Fr-0. The concentration factor of the ultra-filtration was controlled at 1/16. The DOC and color in different MW fractions were measured and listed in Table 1. Table 1. DOC and color of the five components with different MW fractions. Fraction Parameter
Fr-100
Fr-10
Fr-5
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Fr-1
Fr-0
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Industrial & Engineering Chemistry Research
DOC (mg/L) Color (Pt-Co unit)
395.5±0.4 2060±14
377.7±3.3 1927±2
332.7±2.7 1393±3
1663.0±12.7 9987±20
49.1±0.3 46±1
The distributions of DOC and colorants in molecular weight were calculated by Eq.1-2 (take DOC as an example).
η ( DOC, MW (b − a),%) =
DOC (MW < a) V1 / V − DOC (MW < b) V2 / V ×100% DOC (T )
V2 = V1 (1 − γ )
(1)
(2)
where η represents the percentage of MW (b-a) component of the solution before fractionation, a and b represent different MWs (a>b), when b equals to 100 kDa, a variable is meaningless, the sample "MW
