Impact of suspended particles and enhancement techniques on ultraviolet disinfection of a secondary effluent

Wang, Jianling; Wang, Lin; Wang, Baozhen; Zhang, Jinsong; Zou, Qixian

doi:10.1007/s11802-006-0033-y

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…As TSS concentrations in the effluent increase with ow rates, one can assume that the fraction of E. coli attached to TSS is less efficiently removed in the primary settlers 36 and that the UV efficiency is reduced by the presence of the particles. 37,38 In our case, no decrease of WWMP EMCs was observed in the WWTP. Our measurements at the inuent and effluent of the WWTP indicate that these compounds are not removed by the advanced primary treatment in place (Fig.…”

Section: Implications For Cso Managementcontrasting

confidence: 46%

Temporal analysis of E. coli, TSS and wastewater micropollutant loads from combined sewer overflows: implications for management

Madoux-Humery

Dorner

Sauvé

et al. 2015

Environ. Sci.: Processes Impacts

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A combined sewer overflow (CSO) outfall was monitored to assess the impact of temporal mass loads on the appropriateness of treatment options. Instantaneous loads (mass per s) varied by approximately three orders of magnitude during events (n = 9 in spring, summer and the fall) with no significant seasonal variations. The median fraction of total loads discharged with the first 25% of the total volume ranged from 28% (theophylline) to 40% (Total Suspended Solids (TSS)) and loads remained high for the duration of the events. E. coli and TSS loads originated primarily from wastewater (WW) (63% and 75%, respectively). However, a mix of stormwater (SW) and sewer deposit (SD) resuspension contributed from 73 to 95% for the first 50% of the volume discharged of total TSS loads for 2 events. The contribution of SD resuspension was not negligible for Wastewater Micropollutants (WWMPs), especially for carbamazepine. Sustained high loads over the course of CSOs highlight the need to revisit current CSO and SW management strategies that focus on the treatment of early discharge volumes.

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Section: Implications For Cso Managementcontrasting

confidence: 46%

Temporal analysis of E. coli, TSS and wastewater micropollutant loads from combined sewer overflows: implications for management

Madoux-Humery

Dorner

Sauvé

et al. 2015

Environ. Sci.: Processes Impacts

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“…Several studies highlight the role of the concentration and size of the suspended solids in UV disinfection [25,26]. Particles provide shelter to microorganisms against UV by absorbing or reflecting the UV.…”

Section: Uv-c Irradiationmentioning

confidence: 99%

Continuous treatment of non-sterile hospital wastewater by Trametes versicolor: How to increase fungal viability by means of operational strategies and pretreatments

Mir-Tutusaus

Sarrà

Caminal

2016

Journal of Hazardous Materials

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Hospital wastewaters have a high load of pharmaceutical active compounds (PhACs). Fungal treatments could be appropriate for source treatment of such effluents but the transition to non-sterile conditions proved to be difficult due to competition with indigenous microorganisms, resulting in very short-duration operations. In this article, coagulation-flocculation and UV-radiation processes were studied as pretreatments to a fungal reactor treating non-sterile hospital wastewater in sequential batch operation and continuous operation modes. The influent was spiked with ibuprofen and ketoprofen, and both compounds were successfully degraded by over 80%. UV pretreatment did not extent the fungal activity after coagulation-flocculation measured as laccase production and pellet integrity. Sequential batch operation did not reduce bacteria competition during fungal treatment. The best strategy was the addition of a coagulation-flocculation pretreatment to a continuous reactor, which led to an operation of 28days without biomass renovation.

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“…Particles larger than 20 microns were shown to be more important in shielding than smaller particles (Qualls et al, 1983 and1985). Later, Wang et al (2006) further demonstrated that for similar TSS concentrations in different effluent samples, the particle size distribution could be different as a function of varying treatment processes prior to disinfection. In this research, the influence of particles size was used to explain differences in disinfection efficiency between samples.…”

Section: Figure 3 -Impact Of Ballasted Flocculation On Uv Disinfectiomentioning

confidence: 99%

Wastewater Process Modifications for Addressing TSS to Improve UV Disinfection

Bell¹,

Parke²,

Dillon³

et al. 2011

proc water environ fed

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This paper focuses on total suspended solids (TSS) in wastewater effluent, which can have two major negative impacts on ultraviolet (UV) disinfection. First, an increase in TSS may cause a decrease in the disinfection rate, especially at lower UV doses, and second, tailing of the doseresponse curve can be attributed to suspended solids. While the concentration of suspended solids (total weight measurement) is typically used to evaluate the potential performance of a UV disinfection system, correlations between suspended solids concentrations and UV performance are often inconsistent. Past research has shown that suspended solids size has an important impact on UV disinfection efficiency with larger particle size fractions, resulting in lower disinfection efficiency than smaller fractions. A summary of particle size distribution data from several different types of wastewater facilities will be presented, showing the relationship between type of biological treatment process and particle size distribution. Additionally, a case study of a wastewater treatment plant in Massard, Arkansas, will be described in which UV was selected as the disinfection process following a trickling filter, a biological treatment process that can produce solids with a high fraction of large particles. A discussion of the biological process improvements that were implemented to improve TSS conditions making such UV disinfection feasible is also provided.

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Impact of suspended particles and enhancement techniques on ultraviolet disinfection of a secondary effluent

Cited by 7 publications

References 9 publications

Temporal analysis of E. coli, TSS and wastewater micropollutant loads from combined sewer overflows: implications for management

Temporal analysis of E. coli, TSS and wastewater micropollutant loads from combined sewer overflows: implications for management

Continuous treatment of non-sterile hospital wastewater by Trametes versicolor: How to increase fungal viability by means of operational strategies and pretreatments

Wastewater Process Modifications for Addressing TSS to Improve UV Disinfection

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