title: Ecotoxicological assessment of dewatered drinking water treatment residue for environmental recycling.
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.
authors: a The Key Laboratory of Water and Sediment Sciences , Ministry of Education, School of Environment, Beijing Normal University , Beijing , People's Republic of China.
authors: Nannan
authors: http://orcid.org/0000-0002-7821-7969
authors: N
authors: Yuan
authors: b State Key Laboratory of Lake Science and Environment , Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences , Nanjing , People's Republic of China.
authors: Changhui
authors: http://orcid.org/0000-0001-5230-9390
authors: C
authors: Wang
authors: c School of Agriculture and Food Sciences, The University of Queensland , Brisbane , Australia.
authors: Laura A
authors: LA
authors: Wendling
authors: a The Key Laboratory of Water and Sediment Sciences , Ministry of Education, School of Environment, Beijing Normal University , Beijing , People's Republic of China.
authors: Yuansheng
authors: Y
authors: Pei
mesh_terms: D048408:Chlorella vulgaris; D002734:Chlorophyll; D000077194:Chlorophyll A; D054750:Ecotoxicology; D059027:Recycling; D018508:Water Purification
chemical_list: D002734:Chlorophyll; D000077194:Chlorophyll A
keywords: Dewatered drinking water treatment residue; algae; ecotoxicity; leachates; recycling