Silver nanoparticle filter for domestic wastewater reuse. Issue 8 (15th March 2021)

• Record Type: Journal Article
• Authors: Gagneten, Ana M; Romero, Natalí; Reno, Ulises; Regaldo, Luciana; Kergaravat, Silvina V; Rodenak‐Kladniew, Boris E; Castro, Guillermo R
• Is Part Of: Journal of chemical technology & biotechnology. Volume 96:Issue 8(2021)
• Page Start: 2152
• Page End: 2158
• Publication Date: 2021-03-15
• Subjects: silver nanoparticles -- biocide filter -- remediation -- wastewater treatment -- E. coli. coliforms; Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.6710
• Languages: English
• ISSNs: 0268-2575

Abstract

Abstract: BACKGROUND: Under scarcity of freshwater, the reuse and low‐cost technological solutions applied to wastewaters seek to reduce contamination to the users and freshwater biota. RESULTS: A low‐cost cellulose membrane was doped with silver nanoparticles to filter urban wastewater (UW) from a city in Argentina. The total amount of coliforms and Escherichia coli in the filter decreased by 99.6% and 99.9%, respectively. The leak of silver from the filter was 275 ng L −1, analyzed by square wave anodic stripping voltammetry. Silver nanoparticles tested on HepG2 and A549 mammalian cell lines showed no toxicity in a broad concentration range. Calculation of the organic matter provided by dead bacteria post‐filtration was 347 μg L −1 proteins, 148 μg L −1 nucleic acids, 57 μg L −1 lipids, and 53 μg L −1 polysaccharides, indicating high availability of organic matter. The retention of inorganic salts in the filter was 78.5% ammonia, 6.2% nitrates, 97.6% nitrites, and 19.2% phosphates. In post‐filtered UW, the Lactuca sativa germination test showed early seed germination between 90% and 95% in all the dilutions tested. In the range of 6.25% to 50.0%, filtered UW showed no significant differences in the hypocotyl but the difference was significant in the radicle length (mm) compared to the control made of synthetic media ( P < 0.05). CONCLUSION: The development of a low‐cost filter based on cellulose membranes doped with silver nanoparticles allowed the reuse of wastewater for domestic purposes and garden irrigation. © 2021 Society of Chemical Industry (SCI).