Effect of disinfection upon dissolved organic carbon (DOC) in wastewater: bacterial bioassays

Arana, Inés; Santorum, P.; Muela, A.; Barcina, Isabel

doi:10.1046/j.1365-2672.2000.00793.x

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…It should be noted that as the wastewater moves forward in the treatment train its FC and HE content as well as its nutritional content diminishes [4,5]. For this reason, if the adequate disinfection of wastewater at the early stages of the treatment is achieved using low concentrations of PAA and/or metals, it would be possible to preserve the nutrients and thus would represent an advantage when used in agricultural irrigation, without the creation of carcinogenic compounds associated with the addition of chlorine.…”

Section: Introductionmentioning

confidence: 98%

“…At the different stages of a wastewater treatment system, it is possible to eliminate or neutralize, through several mechanisms, those health-related microorganisms [4,5]. However, in the specific case of removal of FC and HE, there are very few physico-chemical and biological processes which by themselves can produce wastewater of Category A microbiological quality from raw wastewater (Table 1), making necessary a final disinfection stage.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of the use of Ag, Cu and PAA to disinfect municipal wastewater

Luna-Pabello

Ríos

Jiménez³

et al. 2009

Environmental Technology

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The WHO defines Category A wastewater as one which does not contain more than 1000 FCU 100 ml(-1) of faecal coliforms (FC) and less than 1 helminth egg (HE) per litre. The objectives of this work were to determine: 1) the disinfectant capacity of different concentrations of silver (Ag), silver-copper (Ag-Cu) and silver-copper-peracetic acid (Ag-Cu-PAA) when added to samples of raw wastewater (RW), with a contact time of 60 minutes; 2) the optimal concentration and contact time required by the better performing disinfectant, determined from the previous stage, to obtain Category A RW; 3) the effect of the selected disinfectant when applied to RW, the effluent of activated sludge (ASE) and the effluent of sand filters (FE) for 10, 30 and 60 min duration. The Ag:Cu:PAA ratio of 0.6:6.0:100.0 mg l(-1), showed the best disinfectant capability to produce Category A wastewater. The ratio of 0.1:1.0:20.0 mg l(-1) of Ag:Cu:PAA and a contact time of 10 minutes are the optimal values to produce Category A wastewater in RW. For RW and ASE, the optimal ratios and times for Ag:Cu:PAA were: 1.2:12.0:90.0 mg l(-1) at 60 min and 0.1:1.0:20.0 for 10 min, respectively. The FE samples showed concentrations of FC and HE below the standards of the WHO; therefore, their disinfection is not necessary.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effectiveness of the use of Ag, Cu and PAA to disinfect municipal wastewater

Luna-Pabello

Ríos

Jiménez³

et al. 2009

Environmental Technology

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“…In fact, significant concentrations of E. coli were reported in many water bodies in California (Walters et al, 2011). Bioassay showed the growth of E. coli in water depends on the nutrient and DOM composition (McCrary et al, 2013; Vital et al, 2010; Arana et al, 2000). In many other studies examining microbial effects on DBP precursors, only indirect methods (e.g., measuring biological oxygen demand) or even no measurements were performed to determine the microbial activity (e.g., Engelage et al, 2009; Krasner et al, 2009; Pellerin et al, 2010).…”

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confidence: 99%

Photochemical and Bacterial Transformations of Disinfection By-Product Precursors in Water

et al. 2013

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In situ grab sampling from source waters and water extraction from source materials are common methods for determining disinfection by-product (DBP) formation potential (FP) of water samples or reactivity of dissolved organic matter (DOM) in forming DBPs during chlorination. However, DOM, as the main DBP precursor, collected using these techniques may not represent the DOM reacting with disinfectants due to biogeochemical alterations during water conveyance to drinking water treatment facilities. In this study, we exposed leachates from fresh litter and associated decomposed duff to natural sunlight or K-12 for 14 d and evaluated the changes, if any, on the propensity to form trihalomethane (THM), haloacetonitrile (HAN), and chloral hydrate (CHD) during chlorination. Sunlight treatment did not significantly change dissolved organic carbon (DOC) concentration but caused a 24 to 43% decrease in the specific ultraviolet absorbance (SUVA) at 254 nm, indicating that UV-active chromophores were transformed or degraded. There were significant increases ( < 0.05) in specific HAN formation potential (HAN-FP) and specific CHD formation potential (CHD-FP) (i.e., HAN and CHD formation potentials per unit carbon), but no change in specific THM formation potential (THM-FP) after sunlight exposure. In contrast, bacterial treatment did not show any significant effect on SUVA, specific chlorine demand, or any specific DBP-FPs, although bacterial colony counts suggested DOM in leachates was utilized for bacterial growth. Results of this study confirmed that the reactivity of DOM in forming DBPs could be different after biogeochemical processes compared with its source materials. For this study, photochemical reactions had a greater effect on DBP-FPs than did microbial degradation.

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“…The flask was again placed in the incubator with orbital agitation for 24 h. Escherichia coli presence is the most reliable indicator of faecal bacterial contamination of surface waters in different countries. An appropriate health-based indicator of microbial pathogens should possess several characteristics (Arana et al, 2000). The indicator should always be present when pathogens are present and should not be detected when the pathogens are absent; it should have a life span similar to that of the pathogens of concern; it should be present in large numbers and should be readily detected by simple and inexpensive methods; and it should not multiply in the environment once it has been shed by the host.…”

Section: Sterile Biological Effluentmentioning

confidence: 99%

Removal of <i>Escherichia coli</i> from biological effluents using natural and artificial mineral aggregates

Miranda-Ríos¹,

Luna-Pabello²,

Velásquez³

et al. 2011

WSA

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Ability for disinfecting sterile biological effluents inoculated with Escherichia coli ATCC 25922 at concentrations of 10 5 CFU/mℓ, using a natural mineral aggregate (NMA) and artificial mineral aggregates (AMA's) consisting of individual oxides as Fe 2 O 3 , Cu 2 O y Ag 2 O and combined oxides as Fe 2 O 3-Cu 2 O, Fe 2 O 3-Ag 2 O, Cu 2 O-Ag 2 O, Fe 2 O 3-Cu 2 O-Ag 2 O, contained in alginate beads, was compared. The results indicate that Ag 2 O and Fe 2 O 3-Ag 2 O, Cu 2 O-Ag 2 O combinations, as well as NMA, inactivated 100% of E. coli in 30 min, whereas the oxides mixture, Fe 2 O 3-Cu 2 O-Ag 2 O, took 13 min. It was observed that redox potential values were closely related to the disinfection level achieved. The advantage resulting from using alginate beads was that these allow the formation of AMA, which has higher disinfectant ability relative to NMA.

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Effect of disinfection upon dissolved organic carbon (DOC) in wastewater: bacterial bioassays

Cited by 6 publications

References 27 publications

Effectiveness of the use of Ag, Cu and PAA to disinfect municipal wastewater

Effectiveness of the use of Ag, Cu and PAA to disinfect municipal wastewater

Photochemical and Bacterial Transformations of Disinfection By-Product Precursors in Water

Removal of <i>Escherichia coli</i> from biological effluents using natural and artificial mineral aggregates

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