Effects of inorganic nutrients on the regrowth of heterotrophic bacteria in drinking water distribution systems

Chu, Chia‐Ching; Lu, Chungsying; Lee, Chi Mei

doi:10.1016/j.jenvman.2004.09.007

Cited by 55 publications

(27 citation statements)

References 18 publications

(13 reference statements)

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“…showed that phosphorus addition increased biofilm bacterial cell number, which agrees with other research work on the effects of phosphorus on biofilm growth in drinking water systems (Lehtola et al 2002;Chu et al 2005;Hozalski et al 2005). Besides the positive effects on the biofilm cell number, we also found that the addition of phosphorus could decrease the biofilm EPS production.…”

Section: Discussionsupporting

confidence: 91%

“…Miettinen et al (1997) and Sathasivan & Ohgaki (1999) suggested keeping the phosphorus level as low as possible or not introducing phosphorus to DWDS at all in order to maintain the biological stability of drinking water. Dosages from 1 mg l 21 to 400 mg l 21 of phosphorus have been proved to increase microbial growth in water and biofilm in DWDS (Lehtola et al 2002;Chu et al 2005;Hozalski et al 2005). Besides the effects on microbial cell growth, there is evidence that the level of phosphorus could affect the EPS production (Hoa et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Effects of phosphorus on biofilm disinfections in model drinking water distribution systems

Fang

Ong

2009

Journal of Water and Health

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Drinking water biofilm development is affected by the available nutrient levels and the presence of disinfectants. Phosphorus is recognized as another important limiting nutrient besides organic carbon. In this study, drinking water biofilms were developed in annular reactors to examine the effects of phosphorus on the biofilm disinfections with free chlorine and monochloramine. Phosphorus addition was found to increase the biofilm cell number but decrease the exopolysaccharides (EPS) production. The disinfection efficacies of both free chlorine and monochloramine were increased when phosphorus was added into the reactor systems. At the same disinfection dosages, monochloramine showed greater biofilm removal efficiency than free chlorine. Monochloramine could be a better choice than free chlorine in biofilm disinfection when phosphate-based corrosion inhibitors are applied.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effects of phosphorus on biofilm disinfections in model drinking water distribution systems

Fang

Ong

2009

Journal of Water and Health

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“…Dosages from 1 to 400 μg l −1 of phosphorus have been proven to be able to increase microbial growth in water and biofilms in DWDS (Lehtola et al. 2002; Chu et al. 2005; Hozalski et al.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, phosphorus has been suggested another limiting nutrient to microbial growth in DWDS (Miettinen et al 1997;Sathasivan and Ohgaki 1999). Dosages from 1 to 400 lg l )1 of phosphorus have been proven to be able to increase microbial growth in water and biofilms in DWDS (Lehtola et al 2002;Chu et al 2005;Hozalski et al 2005). However, little attention has been paid to the effects of phosphorus on other important aspects in biofilms such as EPS production, matrix structure and metabolic activities, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of phosphorus on biofilm formation in model drinking water distribution systems

Fang

Ong

2009

Journal of Applied Microbiology

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Aims: This study investigated the effects of phosphorus on biofilm formation via annular reactor systems in terms of biofilm cell growth, exopolysaccharide (EPS) production, biofilm structure and cell metabolic potential. Methods and Results: Drinking water biofilms were developed in annular reactors with supplement of carbon and different levels of phosphorus. The biofilm formation was monitored over a period of 30 days. Biofilm related parameters were examined by various methods, which included heterotrophic plate count, total carbohydrate content, confocal laser scanning microscopy and GN2 microplate assay. Our results showed that phosphorus addition can promote the biofilm cell growth (cell count increased about 1 log with addition of 30 and 300 μg l−1 of phosphorus). However, the addition of 30 and 300 μg l−1 of phosphorus caused 81% and 77% decrease in EPS production, respectively. The results of biofilm structure analysis showed that the addition of 30 and 300 μg l−1 of phosphorus can induce thicker and less homogeneous biofilms with more biomass. Furthermore, the addition of 30 and 300 μg l−1 of phosphorus dramatically increased the biofilm cell metabolic potential. The addition of 3 μg l−1 of phosphorus was found to have minor effects on the parameters examined. Conclusions: The results indicate phosphorus addition to drinking water distribution system (DWDS) has a complicated effect on the biofilm formation. Significance and Impact of the Study: As the addition of phosphorus at certain levels can affect the biofilm growth in DWDS, care should be taken when phosphate‐based corrosion inhibitors are used in the DWDS.

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“…No oxidizing chemicals are applied. Incomplete nitrification may lead to regrowth in the (non-chlorinated) DW distribution systems since ammonium is a nutrient for many microorganisms (Chu et al 2005). Both the presence of ammonium itself and the biological instability resulting from it may deteriorate water quality and lead to health risks.…”

Section: Introductionmentioning

confidence: 99%

Influence of iron on nitrification in full-scale drinking water trickling filters

Vet

Rietveld

Loosdrecht

2009

Journal of Water Supply: Research and Technology-Aqua

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In the production of drinking water from groundwater, iron removal in filters may interfere with nitrification. Microbiai nitrification might decline because of irreversible accumulation of iron deposits in pores and on filter material. This paper shows the successful application of two experimental techniques applied at a full-scale water treatment plant in the Netherlands to maintain sustainable nitrification. Filter performances were evaluated by measurements of ammonium in the filter effluent, accumulation of deposits and their removal during backwash, development of the mainly inorganic filter coating and media expansion curves. The application of dual-media drinking water trickling filters, in combination with filter backwash with media expansion, minimizes the irreversible accumulation of iron deposits in the filter, subsurface aeration results in a lower iron content of the filter coating.

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Effects of inorganic nutrients on the regrowth of heterotrophic bacteria in drinking water distribution systems

Cited by 55 publications

References 18 publications

Effects of phosphorus on biofilm disinfections in model drinking water distribution systems

Effects of phosphorus on biofilm disinfections in model drinking water distribution systems

Influence of phosphorus on biofilm formation in model drinking water distribution systems

Influence of iron on nitrification in full-scale drinking water trickling filters

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