Simultaneous nitrification–denitrification in slow sand filters

Nakhla, George; Farooq, Shaukat

doi:10.1016/s0304-3894(02)00219-4

Cited by 78 publications

(49 citation statements)

References 11 publications

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“…Nevertheless, the P h /P p decreased from 0.5510 to 0.4613 at 1.30-1.55 m, which indicated that the refractory organics were used during the denitrifying process. This finding was consistent with the findings of Nakhla and Farooq (2003). In this study, the refractory organics that were used as a carbon source were first translated into easily degradable organics before they were used in this process.…”

Section: Organic Matter Transformations During Denitrificationsupporting

confidence: 92%

“…Li et al (2011) studied the total nitrogen (TN) removal efficiencies in SWIS with an effective depth of 1.55 m, and observed the effective removal of total nitrogen without using shunt distributing wastewater. These authors indicated that the most effective range for the denitrification process was 0.7-1.5 m. Nakhla and Farooq (2003) indicated that particulate and slowly biodegradable COD can be utilized for denitrification in slow sand filters. Similarly, Drury and Beauchamp (1991) reported that shunt distributing wastewater could be used to consume oxygen in the system to provide better environmental conditions for the denitrification process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen removal processes in deep subsurface wastewater infiltration systems

Zhang

Wang

et al. 2015

Ecological Engineering

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Section: Organic Matter Transformations During Denitrificationsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Nitrogen removal processes in deep subsurface wastewater infiltration systems

Zhang

Wang

et al. 2015

Ecological Engineering

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“…It has been documented that backwashing can significantly reduce the amount of attached biomass in drinking water biofilters (Gibert et al 2013;Kasuga et al 2007;Lahav et al 2001;Nakhla and Farooq 2003). However, Laurent et al (2003) reported that the overall biomass levels in drinking water BAC filter remained unchanged before and after backwashing.…”

Section: Discussionmentioning

confidence: 99%

“…The impact of backwashing on biomass in drinking water biofilters has yielded considerable attention. A number of previous studies indicated that backwashing could affect the amount of attached biomass (Gibert et al 2013;Kasuga et al 2007;Lahav et al 2001;Miltner et al 1995;Nakhla and Farooq 2003), which could impact the performance of drinking water biofilters (Choi et al 2007;Hozalski and Bouwer 2001). For an example, Liu et al (2012a) revealed that the removal of dissolved organic carbon (DOC) and DON decreased via the running time after backwashing.…”

Section: Introductionmentioning

confidence: 99%

Operational performance, biomass and microbial community structure: impacts of backwashing on drinking water biofilter

Liao

Chen

Zhang

et al. 2014

Environ Sci Pollut Res

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Biofiltration has been widely used to reduce organic matter and control the formation of disinfection by-products in drinking water. Backwashing might affect the biofilters' performance and the attached microbiota on filter medium. In this study, the impacts of backwashing on the removal of dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and N-nitrosamine precursors by a pilot-scale biological activated carbon (BAC) filtration system were investigated. The impacts of backwashing on biomass and microbial community structure of BAC biofilm were also investigated. Phospholipid fatty acid (PLFA) analysis showed that backwashing reduced nearly half of the attached biomass on granular activated carbon (GAC) particles, followed by a recovery to the pre-backwashing biomass concentration in 2 days after backwashing. Backwashing was found to transitionally improve the removal of DOC, DON and N-nitrosamine precursors. MiSeq sequencing analysis revealed that backwashing had a strong impact on the bacterial diversity and community structure of BAC biofilm, but they could gradually recover with the operating time after backwashing. Phylum Proteobacteria was the largest bacterial group in BAC biofilm. Microorganisms from genera Bradyrhizobium, Hyphomicrobium, Microcystis and Sphingobium might contribute to the effective removal of nitrogenous organic compounds by drinking water biofilter. This work could add some new insights towards the operation of drinking water biofilters and the biological removal of organic matter.

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“…However, backwashing also reduces the amount of active biomass in the reactor, which could potentially lead to unstable reactor performance (Lahav et al, 2001;Nakhla and Farooq, 2003). Optimal strategies for backwashing of biofilm reactors used for drinking water treatment are not well defined (Ahmad et al, 1998;Chaudhary et al, 2003;Laurent et al, 2003;Liu et al, 2001).…”

Section: Introductionmentioning

confidence: 99%