Effectiveness of biopolymer coagulants in agricultural wastewater treatment at two contrasting levels of pollution

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Turunen, J., Karppinen, A. & Ihme, R. Effectiveness of biopolymer coagulants in agricultural wastewater treatment at two contrasting levels of pollution. SN Appl. Sci. 1, 210 (2019). https://doi.org/10.1007/s42452-019-0225-x

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Title: Effectiveness of biopolymer coagulants in agricultural wastewater treatment at two contrasting levels of pollution
Author: Turunen, Jarno; Karppinen, Anssi; Ihme, Raimo
Publisher: Springer
Date: 2019
Language: en
Belongs to series: SN Applied Sciences 1, 210 (2019)
ISSN: 2523-3963
DOI: https://doi.org/10.1007/s42452-019-0225-x
URI: http://hdl.handle.net/10138/340903
Abstract: Agricultural diffuse pollution is a major environmental problem causing eutrophication of water bodies. Despite the problem is widely acknowledged, there has been relatively few major advances in mitigating the problem. We studied the effectiveness of biopolymer-based (tannin, starch, chitosan) natural coagulants/flocculants in treatment of two different agricultural wastewaters that differed in their level of phosphorus pollution and turbidity. We used jar-tests to test the effectiveness of the biopolymer coagulants in reducing water turbidity, total phosphorus, and total organic carbon (TOC) from the wastewaters. In more polluted water (total phosphorus: 300 µg/L, turbidity: 130 FNU, TOC: 30 mg/L), all tested biopolymers performed well. The best reductions for different biopolymer coagulants were 64–95%, 80–98% and 14–27%, for total phosphorus, turbidity and TOC, respectively. Tannin and chitosan coagulants performed the best at doses of 5–10 mL/L, whereas starch coagulants had the best performance at 1–2 mL/L doses. Tannin and chitosan coagulants performed clearly better than the starch coagulants. In less polluted water (total phosphorus: 74 µg/L, turbidity: 3.9 FNU, TOC: 21 mg/L), chitosan and starch coagulants did not produce flocs at any of the tested doses. Tannin coagulant performed the best at doses of 5–8 mL/L, where reductions were 70%, 82%, and 22%, for total phosphorus, turbidity and TOC, respectively. The great reductions of phosphorus and turbidity suggests that biopolymer coagulants could be applied in treatment of agricultural water pollution. The high phosphorus retention in the biodegradable biopolymer sludge suggests that the sludge can be readily used as a phosphorus fertilizer, which would aid the recycling of nutrients.
Subject: chitosan
flocculation
natural coagulant
phosphorus
starch
tannin
biopolymer
agricultural wastewater
wastewater treatment
pollution
agriculture
sewage
116 Chemical sciences
1172 Environmental sciences
Subject (ysa): kitosaani
flokkulaatio
sakkautuminen
koagulantit
coagulans
koagulantti
fosfori
tärkkelys
tanniinit
biopolymeerit
luonnonpolymeerit
jätevesi
jätevedenkäsittely
saastuminen
saasteet
maatalous
116 Kemia
1172 Ympäristötiede
Rights: CC BY 4.0


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