Journal ArticleDOI
Cultivation of green algae Chlorella sp. in different wastewaters from municipal wastewater treatment plant.
Liang Wang,Min Min,Yecong Li,Paul Chen,Yifeng Chen,Yuhuan Liu,Yingkuan Wang,Roger Ruan,Roger Ruan +8 more
TLDR
The results of this study suggest that growing algae in nutrient-rich centrate offers a new option of applying algal process in MWTP to manage the nutrient load for the aeration tank to which the centrate is returned, serving the dual roles of nutrient reduction and valuable biofuel feedstock production.Abstract:
The objective of this study was to evaluate the growth of green algae Chlorella sp. on wastewaters sampled from four different points of the treatment process flow of a local municipal wastewater treatment plant (MWTP) and how well the algal growth removed nitrogen, phosphorus, chemical oxygen demand (COD), and metal ions from the wastewaters. The four wastewaters were wastewater before primary settling (#1 wastewater), wastewater after primary settling (#2 wastewater), wastewater after activated sludge tank (#3 wastewater), and centrate (#4 wastewater), which is the wastewater generated in sludge centrifuge. The average specific growth rates in the exponential period were 0.412, 0.429, 0.343, and 0.948 day(-1) for wastewaters #1, #2, #3, and #4, respectively. The removal rates of NH4-N were 82.4%, 74.7%, and 78.3% for wastewaters #1, #2, and #4, respectively. For #3 wastewater, 62.5% of NO3-N, the major inorganic nitrogen form, was removed with 6.3-fold of NO2-N generated. From wastewaters #1, #2, and #4, 83.2%, 90.6%, and 85.6% phosphorus and 50.9%, 56.5%, and 83.0% COD were removed, respectively. Only 4.7% was removed in #3 wastewater and the COD in #3 wastewater increased slightly after algal growth, probably due to the excretion of small photosynthetic organic molecules by algae. Metal ions, especially Al, Ca, Fe, Mg, and Mn in centrate, were found to be removed very efficiently. The results of this study suggest that growing algae in nutrient-rich centrate offers a new option of applying algal process in MWTP to manage the nutrient load for the aeration tank to which the centrate is returned, serving the dual roles of nutrient reduction and valuable biofuel feedstock production.read more
Citations
More filters
Journal ArticleDOI
The potential of sustainable algal biofuel production using wastewater resources
TL;DR: The current research on this topic is reviewed and the potential benefits and limitations of using wastewaters as resources for cost-effective microalgal biofuel production are discussed.
Journal ArticleDOI
Dual role of microalgae: Phycoremediation of domestic wastewater and biomass production for sustainable biofuels production
TL;DR: The use of high rate algal ponds (HRAPs) for nutrient removal has been in existence for some decades though the technology has not been fully harnessed for wastewater treatment as mentioned in this paper.
Journal ArticleDOI
Integrated CO2 capture, wastewater treatment and biofuel production by microalgae culturing—A review
TL;DR: This article presents a critical review, focusing on various microalgae species that consume CO2 and nutrients from wastewater, and provide high quality biofuel.
Journal ArticleDOI
Overview of microalgal extracellular polymeric substances (EPS) and their applications.
TL;DR: Previous research on microalgal EPS derived from green algae, diatoms and red algae is summarized, including compositions/functions/structure, production, and potential applications.
Journal ArticleDOI
A review on the use of microalgal consortia for wastewater treatment
TL;DR: An updated review of the literature regarding the application of microalgal consortia in the remediation of wastewaters from different sources is provided, focusing on the mechanisms involved in nutrients removal by microalgae and the main interactions established between the microorganisms integrating the Consortia and how they can influence nutrients removal efficiencies.
References
More filters
Book
The ecology of freshwater phytoplankton
TL;DR: The phytoplankton-like structure of lakes and rivers has an important role in determining the food web structure of animals and the environment and its role in promoting growth and survival in animals and humans.
ReportDOI
Look Back at the U.S. Department of Energy's Aquatic Species Program: Biodiesel from Algae; Close-Out Report
TL;DR: The Aquatic Species Program (ASP) as mentioned in this paper was a relatively small research effort intended to look at the use of aquatic plants as sources of energy, with an emphasis on algae for biodiesel production.
Journal ArticleDOI
Nitrate: nutrient and signal for plant growth.
TL;DR: This review provides an update on recent molecular advances that have uncovered genes and mechanisms responsible for nitrate uptake, reduction, and regulation and explains how this regulatory network is responsive to both interna1 and external signals.
ReportDOI
TRENDS '90: A compendium of data on global change
TL;DR: The Carbon Dioxide Information Analysis Center (CDIC) as discussed by the authors is a source of frequently used global change data, including estimates for global and national CO 2 emissions from the burning of fossil fuels and from the production of cement, historical and modern records of atmospheric CO 2 and methane concentrations, and several long-term temperature records.
Related Papers (5)
The potential of sustainable algal biofuel production using wastewater resources
Nutrient recovery from wastewater streams by microalgae: Status and prospects
Ting Cai,Stephen Y. Park,Yebo Li +2 more