The performance of BAF using natural zeolite as filter media under conditions of low temperature and ammonium shock load

He, Shengbing; Xue, Gang; Kong, Hainan

doi:10.1016/j.jhazmat.2006.09.024

Cited by 77 publications

(45 citation statements)

References 13 publications

(13 reference statements)

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“…The aeration device introduced the air in an upward direction in order to keep dissolved oxygen (DO) concentrations above 2 mg O 2 L -1 in section TM-P3 (i.e., the reactor was partially aerated). This is one of the innovations of this work, since most of the previous studies with BAF (Villaverde et al 2000;Stephenson et al 2003;Lei et al 2009;Ha et al 2010b;He et al 2007) used fully aerated filters with the aeration device located at the bottom of the reactors. A backwashing system was included in order to remove the excess of both filtered material and biomass (sludge) produced during the biofilter operation.…”

Section: Methodsmentioning

confidence: 99%

“…Recent studies showed good performance for ammonia removal at HLR up to 3 m h -1 and air-flow rates from 18 to 200 L h -1 (Taghizadeh et al 2007;Schulz and Menningmann 2008;Lei et al 2009;Ha et al 2010b;He et al 2007;Rajakumar et al 2011) in fully aerated biofilters fed with higher ammonia concentrations ([100 mg NH 4 -N L -1 ). The HRT was approximately 50 min, which is in the range (20 min to 2 h) reported by Mendoza-Espinosa and Stephenson (1999) and Ha et al (2010b) for downflow aerated biofilters treating real and synthetic wastewater.…”

Section: Operating Conditionsmentioning

confidence: 99%

“…Most of the experiments developed with aerated biofilters used full aeration and the reactors were operated as secondary treatment, with air/water ratios between 4 and 10 to remove higher concentrations of carbon and ammonia, usually from 100 to 2,000 mg C L -1 and from 25 to 2,000 mg N L -1 , respectively (Mendoza-Espinosa and Stephenson 1999;Villaverde et al 2000;Osorio and Hontoria 2001;Stephenson et al 2003;Garzon-Zuniga et al 2005;Lei et al 2009;Ha et al 2010b;He et al 2007;Coetzee et al 2011;Rajakumar et al 2011). …”

Section: Introductionmentioning

confidence: 99%

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Effect of aeration on steady-state conditions in non- and partially aerated low-loaded biofilter

Albuquerque

González‐Martínez

Osorio

2012

Int. J. Environ. Sci. Technol.

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Excessive growth of biomass and retention of solids associated with air bubbles lead to bed clogging, which affects the biofilters' performance. Two experiments were carried out in a submerged biofilter at the flow velocity of 0.5 m h -1 , for an organic loading rate of 51 g C m -3 h -1 and a nitrogen loading rate of 13 g NH 4 -N m -3 h -1 , one with the biofilter not aerated, the other with the biofilter partially aerated. The results showed that the higher head losses occurred in the upper section of the biofilter, where there was a greater biomass development and a higher removal of organic carbon, ammonia and solids, with the maximum allowed head loss being reached in 16 and 8 days. In any case, the steady-state conditions were achieved after 2 days and were interrupted on the tenth day of experiment E1 and on the fifth day of experiment E2. This allowed defining different operating cycles that enabled an average organic removal rate of 12.7 g C m -3 h -1 (27 %) and an average ammonia removal rate of 1.1 g NH4-N m -3 h -1 (9 %) without aeration, and of 35.8 g C m -3 h -1 (76 %) and 6.3 g NH4-N m -3 h -1(51 %) with aeration. Regardless of the aeration conditions, more than 90 % of TOC and NH4-N removal occurred in the upper section. After the backwashing cycle, the biofilter returned to steady-state conditions in 6 h (without aeration) and 7 h (with aeration).

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Section: Methodsmentioning

confidence: 99%

Section: Operating Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of aeration on steady-state conditions in non- and partially aerated low-loaded biofilter

Albuquerque

González‐Martínez

Osorio

2012

Int. J. Environ. Sci. Technol.

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“…Until now, a few studies have showed the removal effi ciency of antibiotics by BAF system. Based on the former literature the potential removal mechanisms of organics in BAF could be attributed to microbial degradation and physical adsorption, whereas the synergy of the two effects could also prolong the operation cycle of biological fi lter bed (He et al 2007, Mann et al 1999). However, the removal rates of antibiotics by BAF can vary among different WWTPs and many factors, such as hydraulic loading, HRT and SRT, could affect the removal of target compounds.…”

Section: Removal Of Antibiotics In Baf Systemmentioning

confidence: 99%

Antibiotics in WWTP discharge into the Chaobai River, Beijing

Zhang¹,

Wang²,

Gao³

et al. 2016

Archives of Environmental Protection

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22 representative antibiotics, including 8 quinolones (QNs), 9 sulfonamides (SAs), and 5 macrolides (MCs) were selected to investigate their occurrence and removal effi ciencies in a Wastewater Treatment Plant (WWTP) and their distribution in the receiving water of the Chaobai River in Beijing, China. Water quality monitoring was performed in an integrated way at different selected points in the WWTP to explore the potential mechanism of antibiotics removal during wastewater treatment. Water quality of the Chaobai River wa s also analyzed to examine environmental distribution in a river ecosystem. The results showed that within all the 22 compounds examined, 10 antibiotics were quantifi ed in wastewater infl uent, 10 in effl uent, and 7 in river. Sulfadiazine (SDZ, 396 ng/L) and Sulfamethazine (SMZ, 382 ng/L) were the dominating antibiotics in the infl uent. Both the conventional treatment and advanced Biological Aerated Filter (BAF) system was important for the removal of antibiotics from the wastewater. And the concentrations of selected antibiotics were ranged from 0-41.8 ng/L in the effl uent-receiving river. Despite the fact that the concentrations were reduced more than 50% compared to effl uent concentrations, WWTP discharge was still regarded as a dominant point-source input of antibiotics into the Chaobai River.

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“…Biofilters with different media sizes have been applied for different purposes [8]. For example, the filter with media sizes above 6 mm is commonly used in pretreatment, 3-6 mm used in the secondary treatment process, and around 3 mm used in tertiary biofilters [9][10][11][12][13][14]. Empty bed retention time (EBRT) is also a key factor affecting the performance of denitrifying biofilters.…”

Section: Introductionmentioning

confidence: 99%

Tertiary Denitrification of the Secondary Effluent by Denitrifying Biofilters Packed with Different Sizes of Quartz Sand

Wei

Shi

et al. 2014

Water

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Tertiary denitrification of the secondary effluent in wastewater treatment plants is necessary to control the eutrophication of receiving water bodies. Two denitrifying biofilters (DNBF), one packed with quart sand with sizes of 2-4 mm (DNBF S ) and the other of 4-6 mm (DNBF L ), were operated for tertiary denitrification under empty bed retention times (EBRTs) of 30 min, 15 min and 7.5 min, respectively. Under EBRTs of 30 min, 15 min and 7.5 min, the NO 3 − -N removal percentages were 93%, 82% and 83% in DNBF S , and were 92%, 68% and 36% in DNBF L , respectively. The nitrogen removal loading rates increased with decreasing EBRTs, and at the EBRT of 7.5 min, the rate was 2.15 kg/(m /min. The performance of both DNBFs was stable within each backwashing cycle, with the NO 3 − -N removal percentage variation within 5%. Better denitrification was achieved in DNBF S but with a slightly high decreased flow rate during the operation.

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The performance of BAF using natural zeolite as filter media under conditions of low temperature and ammonium shock load

Cited by 77 publications

References 13 publications

Effect of aeration on steady-state conditions in non- and partially aerated low-loaded biofilter

Effect of aeration on steady-state conditions in non- and partially aerated low-loaded biofilter

Antibiotics in WWTP discharge into the Chaobai River, Beijing

Tertiary Denitrification of the Secondary Effluent by Denitrifying Biofilters Packed with Different Sizes of Quartz Sand

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