Tag Archives: storage tanks

Contaminants in polyethylene rainwater storage tanks

Thamires de Oliveira Moura, Franciele, Palmeira Campos, Iara Brandão, Yvonilde Dantas Pinto Medeiros. Inorganic and organic contaminants in drinking water stored in polyethylene cisterns Food Chemistry, Volume 273, 1 February 2019. https://doi.org/10.1016/j.foodchem.2018.03.104

This work evaluated the presence of contaminants in stored rainwater in 36 polyethylene tanks installed in two rural communities of the semiarid of Bahia, Brazil. Carbonyl compounds were analyzed by High Performance Liquid Chromatography (HPLC-UV), BTEX (Benzene, Toluene, Ethylbenzene and Xylenes) by gas chromatoghaphy (GC-FID), and trace elements by inductively coupled plasma optical emission spectrometry (ICP-OES). Seven carbonyl compounds were quantified including acrolein (<3–115 µg L−1), which is considered a potent mutagenic agent, above the potability limit in 75% of the cases. Trace elements such as copper, zinc, barium, aluminum and lead, more frequently found, were also quantified, and lead (<0,56–99 µg L−1) was above the tolerable limit for drinking water of 10 μg L−1 in 73% of the cases. The results show that the stored water in polyethylene cisterns in the Brazilian semiarid region does not present satisfactory conditions for human consumption.

Routine Storage Tank Cleaning Necessary to Eliminate Opportunistic Pathogens in Sediments

Struewing I, Yelton S, Ashbolt N. Molecular Survey of Occurrence and Quantity of Legionella spp., Mycobacterium spp., Pseudomonas aeruginosa and Amoeba Hosts in Municipal Drinking Water Storage Tank Sediments. Journal of Applied Microbiology. 2015 Apr 17. doi: 10.1111/jam.12831.

AIM: To examine the occurrence and quantity of potential pathogens and an indicator of microbial contamination in the sediments of municipal drinking water storage tanks (MDWSTs), given the absence of such data across the United States.

METHODS AND RESULTS: Sediment samples (87 MDWST) from eighteen locations across ten states of the U.S. were collected and assayed by qPCR for a range of potential enteric and opportunistic microbial pathogens and a sewage-associated Bacteroides marker. Potential opportunistic pathogens dominated, with the highest detection of occurrence (% positive detection; average cell equivalence [CE]) being Mycobacterium spp. (88.9%; 6.7 ± 8.5 x104 CE g-1 ), followed by Legionella spp. (66.7%; 5.2 ±5.9 x 103 CE g-1 ), Pseudomonas aeruginosa (22.2%; 250 ± 880 CE g-1 ), and Acanthamoeba spp. (38.9%; 53 ± 70 CE g-1 ), with no detected Naegleria fowleri. Most enteric pathogens (Campylobacter jejuni, Escherichia coli 0157:H7, Salmonella enterica, Cryptosporidium parvum and Giardia duodenalis) were not detected, except for a trace signal for Campylobacter spp. There was significant correlation between the qPCR signals of Legionella spp. and Acanthamoeba spp. (R2 =0.61, n=87, P=0.0001). Diverse Legionella spp. including L. pneumophila, L. pneumophila sg1 and L. anisa were identified, each of which might cause legionellosis.

CONCLUSIONS: These results imply that potential opportunistic pathogens are common within MDWST sediments and could act as a source of microbial contamination, but needing downstream growth to be of potential concern.

SIGNIFICANCE AND IMPACT OF THE STUDY: The results imply that opportunistic pathogen risks may need to be managed by regular tank cleaning or other management practices.

Click here for paper (fee).

Goodland (Indiana) water tower collapses

The town’s 50-year-old water tower collapsed Nov. 8, 2011. Of course, the typical response is to go to government for help. But this simply reinforces the fact that a healthy, robust economy is a pre-requisite to a sustainable water system…..not government handouts….click here for news article.

Singapore secures water tanks after body found….

Good idea….click here….

City of Alcoa, Tennessee building new prestressed concrete water reservoirs

Two new above-ground prestressed concrete tanks….$5 million….click here.