OPTIMIZATION OF PHOSPHATE REMOVAL FROM SYNTHETIC WASTEWATER BY BACTERIAL CONSORTIUM USING BOX-BEHNKEN DESIGN

2013 ◽  
Vol 12 (12) ◽  
pp. 2371-2383
Author(s):  
Krishnaswamy Usharani ◽  
Perumalsamy Lakshmanaperumalsamy ◽  
Muthusamy Muthukumar
Keyword(s):  
Bacterial Consortium ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Box Behnken Design

scholarly journals Effect of light/dark cycle on nitrate and phosphate removal from synthetic wastewater based on BG11 medium by Scenedesmus sp.

3 Biotech ◽  
2019 ◽  
Vol 9 (4) ◽  
Author(s):  
Adnan Habibi ◽  
Ghorban Ali Nematzadeh ◽  
Farshid Pajoum shariati ◽  
Hossein Delavari Amrei ◽  
Abolghasem Teymouri
Keyword(s):  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Dark Cycle ◽  
Bg11 Medium ◽  
Effect Of Light

Biological treatment of industrial wastes in a photobioreactor

2006 ◽  
Vol 53 (11) ◽  
pp. 117-125 ◽  
Author(s):  
E. Tamer ◽  
M.A. Amin ◽  
E.T. Ossama ◽  
M. Bo ◽  
G. Benoit
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Algal Growth ◽  
Bacterial Consortium ◽  
Industrial Wastes ◽  
Synthetic Wastewater ◽  
Phenol Removal ◽  
The Real ◽  
Real Wastewater

An algal-bacterial consortium was tested for the treatment from a coke factory. A Chlorella vulgaris strain and a phenol-degrading Alcaligenes sp. were first isolated from the wastewater treatment plant to serve as inocula in the subsequent biodegradation tests. Batch tests were then conducted with samples from the real wastewater or using a synthetic wastewater containing 325 mg phenol/l and 500 mg NH4+/l as target pollutants. Direct biological treatment of the real wastewater was not possible due to the toxicity of organic compounds. Activated carbon adsorption and UV(A-B)-irradiation were efficient in detoxifying the effluent for subsequent biological treatment as inoculation of pretreated samples with the algal-bacterial consortium was followed by complete phenol removal and NH4+ removal of 45%. Complete phenol removal and 33% NH4+ removal were achieved during the fed-batch treatment of artificial wastewater at 6 d hydraulic retention time (HRT). Under continuous feeding at 3.6 d HRT, phenol and NH4+ removal dropped to 58 and 18%, respectively. However, complete phenol removal and 29% NH4+ removal were achieved when 8 g NaHCO3/l was added to the artificial wastewater to enhance algal growth. This study confirms the potential of solar-based industrial wastewater treatment based on solar-based UV pretreatment followed by algal-bacterial biodegradation.

scholarly journals Comparative Performances of Microalgal-Bacterial Co-Cultivation to Bioremediate Synthetic and Municipal Wastewaters Whilst Producing Biodiesel Sustainably

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1427
Author(s):  
Wai Hong Leong ◽  
Kunlanan Kiatkittipong ◽  
Worapon Kiatkittipong ◽  
Yoke Wang Cheng ◽  
Man Kee Lam ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Methyl Esters ◽  
Lipid Production ◽  
Bacterial Consortium ◽  
Biodiesel Production ◽  
Synthetic Wastewater ◽  
Microbial Culture ◽  
Combustion Properties ◽  
Municipal Wastewaters

The potentiality of a microalgal-bacterial culture system was explored in bioremediating wastewater while generating biomass for biodiesel production. A pre-determined optimal activated sludge and microalgal ratio was adopted and cultivation performance was evaluated in both synthetic and municipal wastewater media for nitrogen removal along with biomass and lipid generation for biodiesel production. The microalgal-bacterial consortium grown in the municipal wastewater medium produced higher biomass and lipid yields than those in the synthetic wastewater medium. The presence of trace elements in the municipal wastewater medium, e.g., iron and copper, contributed to the upsurge of biomass, thereby leading to higher lipid productivity. Both the microbial cultures in the synthetic and municipal wastewater media demonstrated similar total nitrogen removal efficiencies above 97%. However, the nitrification and assimilation rates were relatively higher for the microbial culture in the municipal wastewater medium, corresponding to the higher microbial biomass growth. Accordingly, the feasibility of the microalgal-bacterial consortium for bioremediating real municipal wastewaters was attested in this study by virtue of higher biomass and lipid production. The assessment of fatty acid methyl esters (FAME) composition showed the mixed microbial biomasses comprised 80–93% C16 to C18 FAME species, signifying efficient fuel combustion properties for quality biodiesel requirements.

scholarly journals Immobilized Microalgae using Alginate for Wastewater Treatment

2021 ◽  
Vol 29 (3) ◽  
Author(s):  
Amanatuzzakiah Abdul Halim ◽  
Wan Nor Atikah Wan Haron
Keyword(s):  
Wastewater Treatment ◽  
Chlorella Vulgaris ◽  
Immobilized Cells ◽  
High Energy ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Nutrients Removal ◽  
Removal Rates ◽  
Inorganic Substances ◽  
Suspended Cells

Organic and inorganic substances are released into the environment because of domestic, agricultural, and industrial activities which contribute to the pollution of water bodies. Removal of these substances from wastewater using conventional treatment involves high energy cost for mechanical aeration to provide oxygen for aerobic digestion system. During this process, the aerobic bacteria rapidly consume the organic matter and convert it into single cell proteins, water, and carbon dioxide. Alternatively, this biological treatment step can be accomplished by growing microalgae in the wastewater. Chlorella vulgaris immobilized in calcium alginate was used to study the removal efficiency of main nutrients in wastewater such as ammonium and phosphate that act as an important factor in microalgae growth. The immobilized cells demonstrated higher percentage of ammonium and phosphate removal of 83% and 79% respectively, compared to free-suspended cells (76% and 56%). COD removal recorded was 89% and 83% for immobilized cells and free-suspended cells, respectively. The kinetics parameters of nutrients removal for immobilized C. vulgaris in synthetic wastewater were also determined. The specific ammonium removal rates (RA) and phosphate removal rates (RP) for Chlorella vulgaris in synthetic wastewater were 8.3 mg.L-1day-1 and 7.9 mg.L-1day-1, respectively. On the other hand, the kinetic coefficient for each nutrient removal determined were kA = 0.0462 L.mg-1 day-1 NH4 and kP = 0.0352 L.mg-1 day-1 PO43-. This study proves the application of immobilized microalgae cells is advantageous to the wastewater treatment efficiency. Furthermore, optimization on the immobilization process can be conducted to further improve the nutrients removal rates which potentially can be applied in the large-scale wastewater treatment process.

scholarly journals Nutrient removal efficiency of green algal strains at high phosphate concentrations

2019 ◽  
Vol 80 (10) ◽  
pp. 1832-1843 ◽  
Author(s):  
Jairo Hernan Moreno Osorio ◽  
Angelo Del Mondo ◽  
Gabriele Pinto ◽  
Antonino Pollio ◽  
Luigi Frunzo ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Ammonium Acetate ◽  
Carbon Sources ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Green Algal ◽  
Nutrient Removal Efficiency ◽  
High Phosphate ◽  
Mixotrophic Conditions

Abstract The effects of autotrophic and mixotrophic conditions on microalgae growth and nutrient removal efficiency from synthetic wastewater by different microalgae were investigated. Although several studies have demonstrated the suitability of microalgae technologies for ammonia-rich wastewater treatment, only a few have been used for treatment of phosphate-rich industrial wastewaters. In this work, six microalgae were cultivated in batch mode in a growth medium with a high phosphate concentration (0.74 Mm PO43−-P) and different carbon sources (ammonium acetate and sodium bicarbonate) without CO2 supplementation or pH adjustment. Their potential for nutrient removal and biomass generation was estimated. The biomass growth in the reactors was modeled and the data aligned to the Verhulst model with R2 > 0.93 in all cases. Chlorella pyrenoidosa ACUF_808 showed the highest final biomass productivity of 106.21 and 75.71 mg·L−1·d−1 in media with inorganic and organic carbon sources, respectively. The highest phosphorus removal efficiency was 32% with Chlorella vulgaris ACUF_809, while the nitrate removal efficiency in all reactors exceeded 93%. The coupled cultivation of the novel isolated strains of C. pyrenoidosa and C. vulgaris under mixotrophic conditions supplemented with ammonium acetate might be a promising solution for simultaneous nitrate and phosphate removal from phosphorus-rich wastewaters.

Ureolytic phosphate precipitation from anaerobic effluents

2009 ◽  
Vol 59 (10) ◽  
pp. 1983-1988 ◽  
Author(s):  
E. Desmidt ◽  
W. Verstraete ◽  
J. Dick ◽  
B. D. Meesschaert ◽  
M. Carballa
Keyword(s):  
Hydraulic Retention Time ◽  
Ph Value ◽  
Continuous Operation ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Processing Industry ◽  
Operational Conditions ◽  
Constant Ph ◽  
High Concentrations

In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2 +  from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentrations ratio of Mg2 + :PO43−-P:NH4+ required to decrease PO43−-P concentrations from 20 to 6 mg PO43−-P/l at pH 8.4-8.5 was estimated on 4.6:1:8. In the second part of the study, lab-scale experiments with either synthetic wastewater or the anaerobic effluent from a vegetable processing industry were carried out in batch and continuous mode. Overall, the continuous operation at a hydraulic retention time (HRT) of 2.4 h and an added molar concentration [Mg2 + ]:[PO43−-P]:[NH4+] ratio of 1.6:1:2.3 resulted in a constant pH value in the reactor (around 8.5) and an efficient phosphate removal (>90%) to residual levels of 1–2 mg PO43−-P/l. Different operational conditions, such as the initial phosphate concentration, HRT and the use of CaCl2 or MgO instead of MgCl2, were analysed and the performance of the reactor was satisfactory under a broad range of them. Yet, overall, optimal results (higher phosphate removal) were obtained with MgCl2.

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