scholarly journals Microalgae cultivation in wastewater effluent from tilapia culture pond for enhanced bioethanol production

2021 ◽  
Author(s):  
Prakash Bhuyar ◽  
Marlen Trejo ◽  
Natthawud Dussadee ◽  
Yuwalee Unpaprom ◽  
Rameshprabu Ramaraj ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Culture Conditions ◽  
Bioethanol Production ◽  
Nitrogen And Phosphorus ◽  
Treatment Processes ◽  
Aerobic Wastewater Treatment ◽  
Inorganic Substances ◽  
A Cell ◽  
Wastewater Treatment Effluent ◽  
Wastewater Generation

Abstract The large number of wastewaters are generated because of the various production processes. Vegetable and fish processing can be considered an important industry for wastewater generation. The essential method for completing this waste is to digest the organic matter using anaerobic digestion followed by aerobic wastewater treatment processes; however, wastewater from tilapia culture pond retains considerable quantities of inorganic substances, particularly nutrients like nitrogen and phosphorus. The optimal conditions for cultivating Chlorella vulgaris from wastewater treatment effluent from tilapia culture pond were investigated in this study. The appropriate conditions were found to be 10% initial stock suspension, 20 cm depth, and 12 days of culture conditions. C. vulgaris had an optical density of 0.649, a cell density of 17.68 × 105 cells/mL, and biomass of 0.376 ± 94.21 mg/L after cultivation. Discharged wastewater from the fishpond was utilized for the improved growth of microalgae and obtained biomass was used for bioethanol production. This study verified that fishpond wastewater is the best source of nutrients for algal mass production and biofuel applications.

scholarly journals Advances in Synthesis and Applications of Microalgal Nanoparticles for Wastewater Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Prashant Agarwal ◽  
Ritika Gupta ◽  
Neeraj Agarwal
Keyword(s):  
Heavy Metals ◽  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Algae Biomass ◽  
Synthesis Of Nanoparticles ◽  
Microalgae Culture ◽  
Treatment Processes ◽  
Inorganic Substances ◽  
Treatment Technologies ◽  
Rapid Industrialization

Rapid industrialization, economic development, and population overgrowth are the major reasons responsible for the release of organic and inorganic substances into the environment, further leading to environmental pollution and contamination of water. Nowadays, it is truism that wastewater treatment has raised concern worldwide and is the need of the hour. Therefore, it is necessary to conserve sustainable energy and adopt advanced wastewater treatment technologies. Microalgae culture is gaining tremendous attention as it provides a combined benefit of treating wastewater as a growth medium and algae biomass production which can be used for several livestock purposes. Microalgae are ubiquitous and extremely diverse microorganisms which can accumulate toxic contaminants and heavy metals from wastewater, making them superior contender to become a powerful nanofactory. Furthermore, they are versatile, relatively convenient, and easy to handle, along with various other advantages such as synthesis can be performed at low temperature with greater energy efficiency, less toxicity, and low risk to the environment. Comparing with other organisms such as fungi, yeast, and bacteria, microalgae are equally important organisms in the synthesis of nanoparticles; therefore, the study of algae-mediated biosynthesis of nanometals can be taken towards a newer branch and it has been termed as phytonanotechnology. Here, an overview of recent advances in wastewater treatment processes through an amalgamation of nanoparticles and microalgae is provided.

scholarly journals Nitrous oxide emissions during microalgae-based wastewater treatment: current state of the art and implication for greenhouse gases budgeting

2020 ◽  
Vol 82 (6) ◽  
pp. 1025-1030
Author(s):  
Maxence Plouviez ◽  
Benoit Guieysse
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Mitigation Strategies ◽  
High Rate ◽  
Nitrous Oxide Emissions ◽  
Future Research ◽  
N2o Emissions ◽  
Nitrogen And Phosphorus ◽  
Intergovernmental Panel ◽  
Aerobic Wastewater Treatment

Abstract Microalgae can synthesise the ozone depleting pollutant and greenhouse gas nitrous oxide (N2O). Consequently, significant N2O emissions have been recorded during real wastewater treatment in high rate algal ponds (HRAPs). While data scarcity and variability prevent meaningful assessment, the magnitude reported (0.13–0.57% of the influent nitrogen load) is within the range reported by the Intergovernmental Panel on Climate Change (IPCC) for direct N2O emissions during centralised aerobic wastewater treatment (0.016–4.5% of the influent nitrogen load). Critically, the ability of microalgae to synthesise N2O challenges the IPCC's broad view that bacterial denitrification and nitrification are the only major cause of N2O emissions from wastewater plants and aquatic environments receiving nitrogen from wastewater effluents. Significant N2O emissions have indeed been repeatedly detected from eutrophic water bodies and wastewater discharge contributes to eutrophication via the release of nitrogen and phosphorus. Considering the complex interplays between nitrogen and phosphorus supply, microalgal growth, and microalgal N2O synthesis, further research must urgently seek to better quantify N2O emissions from microalgae-based wastewater systems and eutrophic ecosystems receiving wastewater. This future research will ultimately improve the prediction of N2O emissions from wastewater treatment in national inventories and may therefore affect the prioritisation of mitigation strategies.

scholarly journals Decentralised wastewater treatment effluent fertigation: preliminary technical assessment

Water SA ◽  
2018 ◽  
Vol 44 (2 April) ◽  
Author(s):  
W Musazura ◽  
AO Odindo ◽  
EH Tesfamariam ◽  
JC Hughes ◽  
CA Buckley
Keyword(s):  
Wastewater Treatment ◽  
Agricultural Land ◽  
Irrigation System ◽  
Tap Water ◽  
Block Design ◽  
Phosphorus Uptake ◽  
Chemical Properties ◽  
Nitrogen And Phosphorus ◽  
Wastewater Treatment Effluent ◽  
Nitrogen And Phosphorus Uptake

The Decentralised Wastewater Treatment System (DEWATS) can provide a potential sanitation solution to residents living in informal settlements with the effluent produced being used on agricultural land. This paper reports on a first step to assess the technical viability of this concept. To do so a pilot DEWATS plant was connected to 83 houses in the eThekwini Municipality. An experiment was conducted in a randomised complete block design with 2 treatments (DEWATS effluent irrigation and tap water irrigation + fertiliser) and 3 blocks. Banana and taro crops were irrigated using an automated drip irrigation system. Data on the weather, crop growth, nitrogen and phosphorus uptake and soil chemical properties were collected. Irrigation with DEWATS effluent was comparable to tap water + fertiliser especially for banana growth and biomass production. Banana and taro required 3 514 mm of irrigation effluent. About 0.0117 ha·household−1 (23.3 m2·person−1) was found to be an adequate area for effluent reuse. Wet-weather storage requirements were calculated to be about 9.2 m3·household−1. DEWATS effluent, after passing through a horizontal flow wetland, was unable to meet banana and taro nitrogen and phosphorus requirements. Nutrient monitoring is required when using anaerobic filter effluent from a DEWATS for irrigating banana and taro. 

Comparative performance evaluation of full-scale anaerobic and aerobic wastewater treatment processes in Brazil

2009 ◽  
Vol 59 (1) ◽  
pp. 15-22 ◽  
Author(s):  
M. von Sperling ◽  
S. C. Oliveira
Keyword(s):  
Wastewater Treatment ◽  
Statistical Tests ◽  
Full Scale ◽  
Post Treatment ◽  
Uasb Reactor ◽  
Septic Tank ◽  
Actual Behavior ◽  
Treatment Processes ◽  
Aerobic Wastewater Treatment

This article evaluates and compares the actual behavior of 166 full-scale anaerobic and aerobic wastewater treatment plants in operation in Brazil, providing information on the performance of the processes in terms of the quality of the generated effluent and the removal efficiency achieved. The observed results of effluent concentrations and removal efficiencies of the constituents BOD, COD, TSS (total suspended solids), TN (total nitrogen), TP (total phosphorus) and FC (faecal or thermotolerant coliforms) have been compared with the typical expected performance reported in the literature. The treatment technologies selected for study were: (a) predominantly anaerobic: (i) septic tank + anaerobic filter (ST + AF), (ii) UASB reactor without post-treatment (UASB) and (iii) UASB reactor followed by several post-treatment processes (UASB + POST); (b) predominantly aerobic: (iv) facultative pond (FP), (v) anaerobic pond followed by facultative pond (AP + FP) and (vi) activated sludge (AS). The results, confirmed by statistical tests, showed that, in general, the best performance was achieved by AS, but closely followed by UASB reactor, when operating with any kind of post-treatment. The effluent quality of the anaerobic processes ST + AF and UASB reactor without post-treatment was very similar to the one presented by facultative pond, a simpler aerobic process, regarding organic matter.

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