RSM and ANN modelling of dissolved oxygen response using paper industry effluent in semi batch fermenter

2020 ◽  
Vol 188 ◽  
pp. 140-150
Author(s):  
J. Sumathi ◽  
M. Arulmozhi ◽  
S. Sundaram
Keyword(s):  
Dissolved Oxygen ◽  
Paper Industry ◽  
Batch Fermenter ◽  
Industry Effluent

scholarly journals Effect of paper industry effluent on enzyme activity and protein profiling of Chickpea (Cicer arietinum L.)

2017 ◽  
Vol 9 (4) ◽  
pp. 1910-1915
Author(s):  
Rajat Chaudhary ◽  
Anurag Mishra ◽  
Kapil Kumar ◽  
Sonam Arya
Keyword(s):  
Cicer Arietinum ◽  
Tap Water ◽  
Protein Profile ◽  
Paper Industry ◽  
Polyacrylamide Gel Electrophoresis ◽  
Industrial Effluent ◽  
Maximum Activity ◽  
Protein Profiling ◽  
Cicer Arietinum L ◽  
Industry Effluent

Chickpea (Cicer arietinum L.) is a legume which is mostly cultivated in India than other countries that can give significant amounts of dietary minerals and protein to humans. The effect of paper industrial effluent on chick-pea (C. arietinum L.) were analysed along with different concentration (10%, 20% 40%, 60% 80% and 100%) and pure tap water as a control to compare the effect of paper industrial effluent for one week. The amount of protein were comparable with control, their amount was increased at 40% in effluent treated seeds. The maximum activity of enzymes was found below 40% level of effluent. In this study protein profile of imbibed seeds, shoot, root and residual cotyledons were examined under the different concentration of effluent. Polyacrylamide gel electrophoresis of total protein showed that the maximum number of protein bands seen in the imbibed seeds whereas minimum number of protein bands observed in the root. SDS-PAGE revealed that less degradation and/or more rapid accumulation of proteins occurred in higher molecular weight proteins. From this study, it is clear that the industrial effluent rich in organic matter and plant nutrients are finding their use in agriculture as the cheaper way of disposal.

scholarly journals Experimental and Techno-Economic Study on the Use of Microalgae for Paper Industry Effluents Remediation

2021 ◽  
Vol 13 (3) ◽  
pp. 1314
Author(s):  
Maria I. Silva ◽  
Ana L. Gonçalves ◽  
Vítor J. P. Vilar ◽  
José C. M. Pires
Keyword(s):  
Urban Areas ◽  
Net Present Value ◽  
Paper Industry ◽  
Industrial Effluent ◽  
Environmental Benefits ◽  
Co2 Uptake ◽  
Economic Study ◽  
Bioenergy Production ◽  
Legal Limits ◽  
Industry Effluent

Humanity is facing some major global threats, namely lack of environmental sustainability, the energy crisis associated with the unsustainable reliance on fossil fuels, and water scarcity, which will be exacerbated with the rapid growth of urban areas. Researchers have drawn their attention to microalgae, photosynthetic microorganisms known for their environmental applications, such as wastewater remediation and lipids accumulation, to produce third-generation biofuels to solve some of these major issues. Considering this dual role, this study evaluated the potential of the microalga Chlorella vulgaris on nutrient removal from a paper industry effluent and bioenergy production. Firstly, experiments were performed to assess the potential of this microalga to: (i) successfully grow in different concentrations of a paper industry effluent (20% to 100%); and (ii) treat the industrial effluent, reducing phosphorus concentrations to values below the accepted legal limits. Then, a techno-economic assessment was performed to study the viability of a C. vulgaris biorefinery targeting the remediation of a paper industry effluent and bioenergy production. The results have shown that C. vulgaris was able to successfully grow and treat the paper industry effluent. Under these conditions, average biomass productivities determined for this microalga ranged between 15.5 ± 0.5 and 26 ± 1 mg dry weight (DW) L−1 d−1, with maximum biomass concentrations reaching values between 337 ± 9 and 495 ± 25 mg DW L−1 d−1. Moreover, final phosphorus concentrations ranged between 0.12 ± 0.01 and 0.5 ± 0.3 mg P L−1, values below the legal limits imposed by the Portuguese Environment Agency on the paper industry. Regarding the proposal of a microalgal biorefinery for the bioremediation of paper industry effluents with bioenergy production, the techno-economic study demonstrated that six of the seven studied scenarios resulted in an economically-viable infrastructure. The highest net present value (15.4 million euros) and lowest discounted payback period (13 years) were determined for Scenario 3, which assumed a photosynthetic efficiency of 3%, a lipids extraction efficiency of 75%, and an anaerobic digestion efficiency of 45%. Therefore, it was possible to conclude that besides being economically viable, the proposed biorefinery presents several environmental benefits: (i) the remediation of an industrial effluent; (ii) CO2 uptake for microalgal growth, which contributes to a reduction in greenhouse gases emissions; (iii) production of clean and renewable energy; (iv) soil regeneration; and (v) promotion of a circular economy.

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