Abstract
The beneficial recycle of drinking water treatment residue (DWTR) in environmental remediation has been demonstrated in many reports. However, the lack of information concerning the potential toxicity of dewatered DWTR hinders its widespread use. The present study examined the ecotoxicity of dewatered aluminum (Al) and iron (Fe) DWTR leachates to a green alga, Chlorella vulgaris. Data from the variations of cell density and chlorophyll a content suggested that algal growth in DWTR leachates was inhibited. The algal cellular oxidation stress was initially induced but completely eliminated within 72 h by antioxidant enzymes. The expression of three photosynthesis-related algae genes (psaB, psbC, and rbcL) also temporarily decreased (within 72 h). Moreover, the algal cells showed intact cytomembranes after exposure to DWTR leachates. Further investigation confirmed that inhibition of algal growth was due to DWTR-induced phosphorus (P) deficiency in growth medium, rather than potentially toxic contaminants (e.g. copper and Al) contained in DWTR. Interestingly, the leachates could potentially promote algal growth via increasing the supply of new components (e.g. calcium, kalium, magnesium, and ammonia nitrogen) from DWTR. In summary, based on the algae toxicity test, the dewatered Fe/Al DWTR was nontoxic and its environment recycling does not represent an ecotoxicological risk to algae.
| Original language | English |
|---|---|
| Pages (from-to) | 2241-2252 |
| Number of pages | 12 |
| Journal | Environmental Technology |
| Volume | 38 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 17 Sep 2017 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- algae
- Dewatered drinking water treatment residue
- ecotoxicity
- leachates
- recycling
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Ecotoxicological assessment of dewatered drinking water treatment residue for environmental recycling. / Yuan, Nannan; Wang, Changhui; Wendling, Laura A.; Pei, Yuansheng.
In: Environmental Technology, Vol. 38, No. 18, 17.09.2017, p. 2241-2252.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Ecotoxicological assessment of dewatered drinking water treatment residue for environmental recycling
AU - Yuan, Nannan
AU - Wang, Changhui
AU - Wendling, Laura A.
AU - Pei, Yuansheng
PY - 2017/9/17
Y1 - 2017/9/17
N2 - The beneficial recycle of drinking water treatment residue (DWTR) in environmental remediation has been demonstrated in many reports. However, the lack of information concerning the potential toxicity of dewatered DWTR hinders its widespread use. The present study examined the ecotoxicity of dewatered aluminum (Al) and iron (Fe) DWTR leachates to a green alga, Chlorella vulgaris. Data from the variations of cell density and chlorophyll a content suggested that algal growth in DWTR leachates was inhibited. The algal cellular oxidation stress was initially induced but completely eliminated within 72 h by antioxidant enzymes. The expression of three photosynthesis-related algae genes (psaB, psbC, and rbcL) also temporarily decreased (within 72 h). Moreover, the algal cells showed intact cytomembranes after exposure to DWTR leachates. Further investigation confirmed that inhibition of algal growth was due to DWTR-induced phosphorus (P) deficiency in growth medium, rather than potentially toxic contaminants (e.g. copper and Al) contained in DWTR. Interestingly, the leachates could potentially promote algal growth via increasing the supply of new components (e.g. calcium, kalium, magnesium, and ammonia nitrogen) from DWTR. In summary, based on the algae toxicity test, the dewatered Fe/Al DWTR was nontoxic and its environment recycling does not represent an ecotoxicological risk to algae.
AB - The beneficial recycle of drinking water treatment residue (DWTR) in environmental remediation has been demonstrated in many reports. However, the lack of information concerning the potential toxicity of dewatered DWTR hinders its widespread use. The present study examined the ecotoxicity of dewatered aluminum (Al) and iron (Fe) DWTR leachates to a green alga, Chlorella vulgaris. Data from the variations of cell density and chlorophyll a content suggested that algal growth in DWTR leachates was inhibited. The algal cellular oxidation stress was initially induced but completely eliminated within 72 h by antioxidant enzymes. The expression of three photosynthesis-related algae genes (psaB, psbC, and rbcL) also temporarily decreased (within 72 h). Moreover, the algal cells showed intact cytomembranes after exposure to DWTR leachates. Further investigation confirmed that inhibition of algal growth was due to DWTR-induced phosphorus (P) deficiency in growth medium, rather than potentially toxic contaminants (e.g. copper and Al) contained in DWTR. Interestingly, the leachates could potentially promote algal growth via increasing the supply of new components (e.g. calcium, kalium, magnesium, and ammonia nitrogen) from DWTR. In summary, based on the algae toxicity test, the dewatered Fe/Al DWTR was nontoxic and its environment recycling does not represent an ecotoxicological risk to algae.
KW - algae
KW - Dewatered drinking water treatment residue
KW - ecotoxicity
KW - leachates
KW - recycling
UR - http://www.scopus.com/inward/record.url?scp=84995665361&partnerID=8YFLogxK
U2 - 10.1080/09593330.2016.1255665
DO - 10.1080/09593330.2016.1255665
M3 - Article
VL - 38
SP - 2241
EP - 2252
JO - Environmental Technology
JF - Environmental Technology
SN - 0959-3330
IS - 18
ER -