Impact of high chloride wastewater on an anaerobic/anoxic/aerobic process with and without inoculation of chloride acclimated seeds

Panswad, Thongchai; Anan, Chadarut

doi:10.1016/s0043-1354(98)00314-5

Cited by 152 publications

(79 citation statements)

References 11 publications

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“…Inorganic platelets can rarely be found. The phenomena that salt in wastewater reduced the abundance of filamentous organisms were observed by many researchers (Kargi and Dincer 1996;Panswad and Anan 1999). However, filamentous bacteria were not inhibited by salinity in this study.…”

Section: Kinetics Characterizationsupporting

confidence: 40%

“…The situation is not in line with the case of saline wastewater treatment. Many researchers report that elevated salt levels have a negative impact on the settling characteristics of freshwater activated sludge and result in reduction of settling efficiency (Kargi and Dincer 1996;Panswad and Anan 1999). Comparing this result with acclimated freshwater activated sludge, it is reasonable to conclude that halophilic filamentous bacteria may be responsible for good settling and flocculation.…”

Section: Kinetics Characterizationmentioning

confidence: 83%

“…Metabolism-oriented engineering approach, acclimating freshwater microorganisms to saline environment, was the most often reported approach, which has been proved feasible to obtain satisfying removal of carbonaceous and nitrogenous pollutants at relatively low salinity (Bassin et al 2011;Panswad and Anan 1999;Uygur 2006). However, further application of this approach for hypersaline wastewater treatment is limited by difficulties that (1) salt-adapted biological system cannot perform stable and effective pollutant removal from saline wastewater containing over 3 % salinity, especially for removal of nitrogenous matters (Panswad and Anan 1999), that (2) low sedimentation efficiencies induced by high buoyancy in high-salinity environment interfered with effective solid-liquid separation (Panswad and Anan 1999;Uygur 2006), and that (3) serious salt inhibition reduced bacterial activity, resulting in inactivity or even death (Chen et al 2003). Therefore, utilizing salt acclimation of freshwater bacteria seemed impossible to treat hypersaline wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Cui

Ding

et al. 2013

Int. J. Environ. Sci. Technol.

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Nitrogen removal from hypersaline wastewater was successfully started up by inoculating estuarine sediments for 140 days. Efficient ammonia and total nitrogen removal was sustained under specific ammonia loading of 0.016-0.139 kg N/[kg VSS day] in a sequencing batch reactor. Stable nitrite accumulation was observed during nitrification. The specific ammonia consumption rate was higher than the value of freshwater activated sludge and saltacclimated freshwater activated sludge. With methanol as carbon source, specific nitrite reduction rate of halophilic denitrifiers was much less than the freshwater counterpart. Halophilic activated sludge was characterized as good settling and flocculation prosperity with small floc size and netlike sludge structure. The abundance of ammonia-oxidizing bacteria outnumbered ammonia-oxidizing archaeas in both estuarine sediments and the activated sludge. Nitrifier population was dominated by the halophilic members of genus Nitrosomonas. This study demonstrated the application of mixed halophilic consortia for efficient nitrogen removal, overcoming the limits and difficulties of applying freshwater bacteria for saline wastewater treatment.

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Section: Kinetics Characterizationsupporting

confidence: 40%

Section: Kinetics Characterizationmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Cui

Ding

et al. 2013

Int. J. Environ. Sci. Technol.

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“…2, the raw wastewater was diluted with the aim of operating the SBR without sudden changes in salinity, as previous studies [19,20] have reported that salinity changes negatively affect the efficiency of the biological process [21,22]. In addition, dilution provides a less polluting load, which improves the removal efficiencies when toxic substances are also present, as in the case of tannery wastewater, as reported by Sirianuntapiboon [23].…”

Section: Effect Of the Variation Of Hrt On The Sbr Performancementioning

confidence: 99%

“…These results may have been caused by the presence of filamentous bacteria that negatively affect the floc structure (Fig. 4 a) [21,22]. In order to improve the quality of the effluent, additional settling experiments were carried out using polyelectrolytes [24,27].…”

Section: Settling Experimentsmentioning

confidence: 99%

Performance Improvement of a Sequencing Batch Reactor for Treating Tannery Wastewaters

et al. 2017

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Tannery wastewater has a high environmental impact due to its low biodegradability. Sequencing batch reactors (SBRs) are an established method for treating highly polluted wastewater. To minimize the hydraulic retention time (HRT) of the SBRs, various HRT values were tested and the best value was chosen according to the removal efficiency of the soluble chemical oxygen demand (COD). A series of experiments was then carried out with two cationic polyelectrolytes added to the system in two different modes to improve the effluent quality. Both modes were evaluated in terms of the soluble COD, suspended solid concentration, and turbidity of the final effluent. The results showed that reducing the HRT to two days did not diminish the COD removal efficiencies.

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Effects of Salt on Microbial Populations and Treatment Performance in Purifying Saline Sewage Using the MUCT Process

Cui

Peng

Peng³

et al. 2009

CLEAN Soil Air Water

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Understanding salt effects on activated sludge systems and treatment performance is essential in order to design and operate a full scale treatment plant processing saline sewage. For this purpose, a bench scale modified University of Cape Town (MUCT) process for treating saline sewage was used to provide information with regard to microbial population shift and treatment performance. Various salt levels (5, 8, 10 and 15 g/L) were studied. Experimental results indicated that the salt concentration in sewage significantly affected phosphorous removal, while salt inhibition of ammonium degradation was slight, even in a 15 g/L salt solution. Outstanding nitrite accumulation in aerobic tanks occurred in the MUCT treating 8 g/L saline sewage, which resulted in denitrifying nitrite by phosphorous accumulating organisms (PAOs) in the anoxic tank. Population size of physiological groups (aerobic-heterotrophic, nitrifying and denitrifying microbial group) was also investigated at different salt levels. The investigation of changes in the dynamics of the activated sludge microbial structure gave an insight into the nature and the magnitude of salt effects on the microbial community.

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Impact of high chloride wastewater on an anaerobic/anoxic/aerobic process with and without inoculation of chloride acclimated seeds

Cited by 152 publications

References 11 publications

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Performance Improvement of a Sequencing Batch Reactor for Treating Tannery Wastewaters

Effects of Salt on Microbial Populations and Treatment Performance in Purifying Saline Sewage Using the MUCT Process

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