scholarly journals Nutrient removal from Chinese coastal waters by large-scale seaweed aquaculture

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Xi Xiao ◽  
Susana Agusti ◽  
Fang Lin ◽  
Ke Li ◽  
Yaoru Pan ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Coastal Waters ◽  
Large Scale ◽  
Seaweed Aquaculture

scholarly journals Challenges for marine macroalgal biomass production in Indian coastal waters

2020 ◽  
Vol 63 (4) ◽  
pp. 327-340
Author(s):  
Kapilkumar Nivrutti Ingle ◽  
Hadar Traugott ◽  
Alexander Golberg
Keyword(s):  
Coastal Waters ◽  
Large Scale ◽  
Full Potential ◽  
Seaweed Cultivation ◽  
Indian Government ◽  
Processing Technologies ◽  
Macroalgal Biomass ◽  
Large Scale Cultivation ◽  
Macroalgal Cultivation ◽  
Seaweed Industry

AbstractDue to its large, exclusive economic zone, India has considerable potential for implementing large-scale cultivation of macroalgae. However, such cultivation requires the availability of, and access to, sites where technical, legal, governmental, and environmental factors are favorable. This review discusses the challenges that have held back the development of seaweed cultivation in India. The review is based on a literature survey and informal discussions with industry-related personnel. It cites the strong need for clear and definitive policies related to access to and use of coastal waters to enable the Indian seaweed industry to reach its full potential. The main challenges that the expansion of macroalgal cultivation in India face are related to legal and regulatory aspects that can be resolved by focusing the policy issues on providing planning tools toward success. In addition, there is a strong need for an adequate bioeconomy that clearly defines the need for marine macroalgal biomass for food, chemicals, and biofuels. Furthermore, the Indian government needs to allocate sufficient funds for accelerating seaweed R&D in areas of seaweed cultivation, harvesting, processing technologies, and their implementation in the local industry.

Algal biofuels from wastewater treatment high rate algal ponds

2011 ◽  
Vol 63 (4) ◽  
pp. 660-665 ◽  
Author(s):  
R. J. Craggs ◽  
S. Heubeck ◽  
T. J. Lundquist ◽  
J. R. Benemann
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Large Scale ◽  
Low Cost ◽  
Algal Species ◽  
Climatic Conditions ◽  
Biofuel Production ◽  
High Rate ◽  
Algal Production ◽  
High Rate Algal Ponds

This paper examines the potential of algae biofuel production in conjunction with wastewater treatment. Current technology for algal wastewater treatment uses facultative ponds, however, these ponds have low productivity (∼10 tonnes/ha.y), are not amenable to cultivating single algal species, require chemical flocculation or other expensive processes for algal harvest, and do not provide consistent nutrient removal. Shallow, paddlewheel-mixed high rate algal ponds (HRAPs) have much higher productivities (∼30 tonnes/ha.y) and promote bioflocculation settling which may provide low-cost algal harvest. Moreover, HRAP algae are carbon-limited and daytime addition of CO2 has, under suitable climatic conditions, the potential to double production (to ∼60 tonnes/ha.y), improve bioflocculation algal harvest, and enhance wastewater nutrient removal. Algae biofuels (e.g. biogas, ethanol, biodiesel and crude bio-oil), could be produced from the algae harvested from wastewater HRAPs, The wastewater treatment function would cover the capital and operation costs of algal production, with biofuel and recovered nutrient fertilizer being by-products. Greenhouse gas abatement results from both the production of the biofuels and the savings in energy consumption compared to electromechanical treatment processes. However, to achieve these benefits, further research is required, particularly the large-scale demonstration of wastewater treatment HRAP algal production and harvest.

Large-scale utilization of water hyacinth for nutrient removal in Lake Dianchi in China: The effects on the water quality, macrozoobenthos and zooplankton

Chemosphere ◽  
2012 ◽  
Vol 89 (10) ◽  
pp. 1255-1261 ◽  
Author(s):  
Zhi Wang ◽  
Zhiyong Zhang ◽  
Junqian Zhang ◽  
Yingying Zhang ◽  
Haiqing Liu ◽  
...  
Keyword(s):  
Water Quality ◽  
Nutrient Removal ◽  
Water Hyacinth ◽  
Large Scale ◽  
Lake Dianchi

scholarly journals THE NILE LITTORAL CELL AND MAN'S IMPACT ON THE COASTAL ZONE OF THE SOUTHEASTERN MEDITERRANEAN

1984 ◽  
Vol 1 (19) ◽  
pp. 109 ◽  
Author(s):  
Douglas L. Inman ◽  
Scott A. Jenkins
Keyword(s):  
Coastal Waters ◽  
Coastal Erosion ◽  
Large Scale ◽  
River Flow ◽  
Nile Delta ◽  
Mediterranean Coast ◽  
Nile River ◽  
Sediment Source ◽  
Littoral Cell ◽  
The Mediterranean

Man's intervention with coastal processes takes many forms. However, the most serious large scale, long term coastal erosion results from the interception by dams of rivers supplying sediment to the coast. This loss of sediment may have catastrophic effects along coasts where streams discharge directly into coastal waters. The Nile littoral cell is an impressive example of the effect of dams on coastal erosion. The Nile littoral cell is located in the southeastern Mediterranean Sea and extends 700 km from Alexandria, Egypt in the south to Akko, Israel in the north. The sediment load from the Nile River was deposited along the submerged portion of the delta, where it was sorted and transported to the east by the prevailing waves and by currents of the counterclockwise east Mediterranean gyre that commonly flows at about 50 cm sec over the delta. Prior to 1964, the turbid plume of the flood waters of the Nile River could be traced along the Mediterranean coast for over 700 km to the shores of Lebanon. Fine silt and clay sized material were carried easterly and into deeper water, while sand is carried easterly along the shelf and shore as far as Haifa Bay. Until 1964, the major sediment source of the littoral cell was the Nile River. Construction of the High Aswan Dam, which began filling in 1964, has resulted in a near absence of Nile River flow into the Mediterranean and a corresponding complete loss of the Nile River as a source of nutrients to coastal waters, and as an active sediment source for the delta and the coastline of the Nile littoral cell. As a result, the Nile Delta is now subject to severe erosion in a number of localities.

scholarly journals COAST AND GEODETIC SURVEY DATA - AN AID TO THE COASTAL ENGINEER

2010 ◽  
Vol 1 (1) ◽  
pp. 11
Author(s):  
Robert F. A. Studds
Keyword(s):  
United States ◽  
Coastal Waters ◽  
Large Scale ◽  
The United States ◽  
Geodetic Survey ◽  
Coastal Regions ◽  
Preliminary Study ◽  
Construction Plans ◽  
Topographic Surveys

In its long career of surveying and chartering the coastal waters of the United States and possessions, a career which dates back to the early part of the nineteenth century, the work of the Coast and Geodetic Survey has been associated with the problems of the coastal engineer. Its successive hydrographic and topographic surveys of the coastal regions furnish basic data for the study of changes in the coastline and adjacent underwater topography and the means to arrest these changes; its tide and current surveys provide the fundamental data necessary in the design of waterfront structures and in harbor improvement; and its geodetic control surveys provide an accurate base for the preliminary study and final construction plans for large-scale improvement projects. To a lesser extent the geomagnetic and seismologic data of the Bureau have also been used by the coastal engineer.

scholarly journals Copper-zeolite integrated stormwater biofilter for nutrient removal – the impact of intermittent wetting and drying conditions

2020 ◽  
Vol 2 (1) ◽  
pp. 352-363
Author(s):  
Yali Li ◽  
Ana Deletic ◽  
David T. McCarthy
Keyword(s):  
Total Nitrogen ◽  
Water Permeability ◽  
Nutrient Removal ◽  
Large Scale ◽  
High Water ◽  
Sand Filters ◽  
Drying Conditions ◽  
Copper Zeolite ◽  
The Impact

Abstract A large-scale column study was conducted to examine the sediment and nutrient removal performance of stormwater biofilters that contained layers of novel copper-zeolite filter media. The filters were exposed to stormwater under varied dosing frequency over 33 weeks and were assessed for their hydraulic performance and their efficiency in removing sediment and nutrients. The non-vegetated sand filters with layers of copper-zeolite media (SCu filters) achieved consistently good removal of total phosphorus (87%) despite the challenging dry-wet cycles, and the effluent concentration met a long-term irrigation guideline (0.05 mg/L). The same design achieved 51% removal of total nitrogen above the Australian runoff quality load reduction targets (45%). Incorporation of Leptospermum continentale into the copper-zeolite filters (LCCu-T) maintained the phosphorus removal (86%) and led to a slight increase in total nitrogen removal (57%). Both designs maintained good water permeability (200 mm/h at the end of the last wet period). Copper-zeolite played a mixed role in the system: enhancing nutrients removal through precipitation and ion exchange, maintaining high water permeability, limiting the advantages of vegetation on nutrient removal. Future studies should refine biofilter design and vegetation selection to augment the performance of copper-zeolite filters by integrating the advantages of vegetation on nutrient removal.

Maritime Boundaries on National Ocean Service Nautical Charts

1993 ◽  
pp. 9-15
Author(s):  
Charles Harrington
Keyword(s):  
United States ◽  
United States Of America ◽  
Coastal Waters ◽  
Large Scale ◽  
Geneva Convention ◽  
The United States ◽  
Lead Agency ◽  
Technical Aspects ◽  
History Of ◽  
Definition Of

The National Ocean Service (NOS) is responsible for charting the Nation's coastal waters and, therefore, is the lead Agency for the portrayal of maritime limits of the United States of America. The 1958 Geneva Convention on the Territorial Sea and the Contiguous Zone states " ... the normal baseline for measuring the breadth of the territorial sea is the low waterline along the coast as marked on large-scale charts officially recognized by the coastal state." In 1976, NOS was requested to show various maritime limits on its regular issue of nautical charts. The paper presents the history of maritime boundaries on National Ocean Service (NOS) charts, methods used in constructing the various maritime limits, the definition of the limits, the push for lateral seaward boundaries, and the technical aspects of maritime limits.

Using wastewater and high-rate algal ponds for nutrient removal and the production of bioenergy and biofuels

2013 ◽  
Vol 67 (4) ◽  
pp. 915-924 ◽  
Author(s):  
David Batten ◽  
Tom Beer ◽  
George Freischmidt ◽  
Tim Grant ◽  
Kurt Liffman ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Large Scale ◽  
Oxygen Demand ◽  
Recent Change ◽  
High Rate ◽  
Coastal Zones ◽  
Nitrogen And Phosphorus ◽  
Treatment Technology ◽  
Algae Biomass

This paper projects a positive outcome for large-scale algal biofuel and energy production when wastewater treatment is the primary goal. Such a view arises partly from a recent change in emphasis in wastewater treatment technology, from simply oxidising the organic matter in the waste (i.e. removing the biological oxygen demand) to removing the nutrients – specifically nitrogen and phosphorus – which are the root cause of eutrophication of inland waterways and coastal zones. A growing need for nutrient removal greatly improves the prospects for using new algal ponds in wastewater treatment, since microalgae are particularly efficient in capturing and removing such nutrients. Using a spreadsheet model, four scenarios combining algae biomass production with the making of biodiesel, biogas and other products were assessed for two of Australia’s largest wastewater treatment plants. The results showed that super critical water reactors and anaerobic digesters could be attractive pathway options, the latter providing significant savings in greenhouse gas emissions. Combining anaerobic digestion with oil extraction and the internal economies derived from cheap land and recycling of water and nutrients on-site could allow algal oil to be produced for less than US$1 per litre.

Sign in / Sign up

Export Citation Format

Share Document