The performance of SBR, SCR, and MSCR for simultaneous biodegradation of high concentrations of formaldehyde and ammonia

Moussavi, Gholamreza; Heidarizad, Mahdi

doi:10.1016/j.seppur.2010.11.028

Cited by 33 publications

(23 citation statements)

References 30 publications

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“…Furthermore, sewage effluent transparency increased to 148.48% greater than the original, and dissolved oxygen (DO) increased 240%, compared to the original. Similarly, Moussavi & Heidarizad [22] added a mixture of bacteria to SBR directionally and found that the time of domestication and aeration was shortened, and the disposal ability and the effects of sequencing batch reactor (SBR) process were significantly improved, with a COD removal efficiency of greater than 92%. The wastewater purification abilities of B. subtilis , Saccharomyces , Lactobacillus and mixed strains were studied by Morikawa [23], and the results showed that the mixture of flora had a synergistic effect, improving the disposal capacity of the pollutants, with NH 3 –N and removal efficiencies reaching 93.2% and 97.8%, respectively.…”

Section: Results and Analysismentioning

confidence: 99%

Effects of the inclusion of a mixed Psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

Tang

Yang

et al. 2018

R. Soc. open sci.

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Constructed wetlands (CWs) have been used globally in wastewater treatment for years. CWs represent an efficient ecological system which is both energy-saving and low in investment for construction and operational cost. In addition, CWs also have the advantage of being easy to operate and maintain. However, the operation of CWs at northern latitudes (both mid and high) is sometimes quite demanding, due to the inhibitory effect of low temperatures that often occur in winter. To evaluate the wastewater treatment performance of a culture of mixed Psychrotrophic bacteria strains in an integrated vertical-flow CW, the removal rates of ammonia nitrogen (NH3–N), chemical oxygen demand (COD), nitrite nitrogen false(NO2−−Nfalse), nitrate nitrogen false(NO3−−Nfalse) and total phosphorus (TP) were quantified at different bacterial dosages to determine the best bacterial dosage and establish kinetic degradation models of the mixed strains. The bacterial culture was made up of Psychrobacter TM-1, Sphingobacterium TM-2 and Pseudomonas TM-3, mixed together at a volume/volume ratio of 1 : 1 : 1 (at bacterial suspension concentrations of 4.4 × 109 ml−1). Results showed that the organic pollutants (nitrogen and phosphorus) in the sewage could be efficiently removed by the culture of mixed Psychrotrophic bacteria. The optimal dosage of this mixed bacteria strain was 2.5%, and the treatment efficiency of COD, NH3–N, NO2−−N, NO3−−N, total nitrogen and TP were stable at 91.8%, 91.1%, 88.0%, 93.8%, 94.8% and 95.2%, respectively, which were 1.5, 2.0, 2.1, 1.5, 2.2 and 1.3 times those of the control group. In addition, a pseudo-first-order degradation model was a good fit for the degradation pattern observed for each of these pollutants.

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Section: Results and Analysismentioning

confidence: 99%

Effects of the inclusion of a mixed Psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

Tang

Yang

et al. 2018

R. Soc. open sci.

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“…Production of foam in aerobic processes from anionic surfactants is a main problem, especially when its dose is high. In that case, there can be two suggestions; first, using antifoam materials and second, improving MLSS in the bioreactor to decreases the foam production significantly (20). Considering the media age of more than 20 years as well as the electrical energy reduction which can be applied in other processes for returning the sludge, we can nominate this process as a qualified one for treating wastewaters containing detergents.…”

Section: Discussionmentioning

confidence: 99%

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

2014

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Background: Detergents and difficulties of their presence in the water and wastewater cause various problems such as foam production, anomalies in the growth of algae, and accumulation and dispersion in aqueous environments. Objectives: The aim of this study was to examine and compare the moving bed biofilm reactor with another reactor without media (carries) for anionic surfactants removal. Materials and Methods: In this study, the media was from the 2H Company with specific surface of 535 m 2 /m 3 and the experiment reactor was made of a 4-mm plexiglass. The experiment was conducted by using two reactor, as one of them was without media, with exactly similar conditions to compare their operations. The standard method (MBAS) was used to measure the anionic surfactant. The concentrations of the examined anionic surfactant were 50, 100, 200, 300, and 400 mg/L in hydraulic retention times (HRTs) of 72, 24 and 8 hours. Results: The removal percentage for both reactors at 50 mg/L concentration of pollutant was same, but after gradually increasing the pollutant concentration and decreasing the HRT, the media-containing reactor had significant efficiency in comparison with the other one. The optimum condition in this experiment was obtained at HRT of about 24 hours and 200 mg/L pollutant concentration with 99.2% removal. Conclusions: Regarding the anionic surfactant standard in Iran which is 1.5 mg/L for surface water discharge, using this process is suitable for treating municipal wastewater and industrial wastewater, containing 100-200 mg/L pollutant. However, for the industries that produce detergents, discharging more than 200 mg/L surfactants to the wastewater, using supplementary treatments for achieving the discharge standard are required.

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“…The biodegradation tests were conducted using formaldehyde-acclimated biomass at the same concentration. Biomass was obtained from a bench-scale bioreactor efficiently treating high concentration formaldehyde wastewater [3]. At each biodegradation test, 150 mL of feed solution (effluent of EFP or raw formaldehyde solution) was mixed with 50 mL of biomass suspension in the bioreactor.…”

Section: Methodsmentioning

confidence: 99%

“…Many industries such as synthetic adhesive and resin manufacturing, chemical and petrochemical plants, wood processing and paper mills, all discharge effluent containing formaldehyde [1][2][3] at concentrations that can be as high as 10 g/L [1]. Formaldehyde, is listed as a hazardous substance [4], it is a highly toxic compound that affects both human health and aquatic life [5].…”

Section: Introductionmentioning

confidence: 99%

“…Research has demonstrated that formaldehyde can be treated efficiently by various bioreactors up to moderate concentrations [3,5,7]. However, the main challenge in applying this process occurs when dealing with industrial effluent (for example those mentioned above) that has formaldehyde concentrations beyond the capacity of the tested bioreactors (typically formaldehyde concentration greater than around 1.5-2 g/L).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The investigation of degradation and mineralization of high concentrations of formaldehyde in an electro-Fenton process combined with the biodegradation

Moussavi¹,

Bagheri²,

Khavanin³

2012

Journal of Hazardous Materials

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The performance of SBR, SCR, and MSCR for simultaneous biodegradation of high concentrations of formaldehyde and ammonia

Cited by 33 publications

References 30 publications

Effects of the inclusion of a mixed Psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

Effects of the inclusion of a mixed Psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

The investigation of degradation and mineralization of high concentrations of formaldehyde in an electro-Fenton process combined with the biodegradation

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