scholarly journals Distribution of nutrients and phosphorus recovery in hydrothermal liquefaction of waste streams

2022 ◽  
Vol 156 ◽  
pp. 106323
Author(s):  
Aisha Matayeva ◽  
Stephanie R. Rasmussen ◽  
Patrick Biller
Keyword(s):  
Hydrothermal Liquefaction ◽  
Phosphorus Recovery ◽  
Waste Streams

scholarly journals Phosphorus flows on ships: Case study from the Baltic Sea

2018 ◽  
Vol 233 (2) ◽  
pp. 528-539 ◽  
Author(s):  
Magda Wilewska-Bien ◽  
Lena Granhag ◽  
Jukka-Pekka Jalkanen ◽  
Lasse Johansson ◽  
Karin Andersson
Keyword(s):  
Baltic Sea ◽  
Food Waste ◽  
Flow Analysis ◽  
Material Flow Analysis ◽  
Phosphorus Recovery ◽  
Nutrient Concentrations ◽  
Waste Streams ◽  
The Baltic Sea ◽  
Passenger Ships ◽  
The Baltic

Material flow analysis is used to identify and quantify the flow of phosphorus (P) in ship-generated food waste and wastewater. Passenger, cruise, RoPax and cargo ships in the Baltic Sea were investigated in three scenarios: (1) if all waste is discharged to sea, (2) if all waste is disposed of ashore or (3) if the food waste fraction is disposed of ashore and wastewater is treated on-board. About 107 tonnes of P is generated annually in the waste streams, with highest contribution of approximately 62 tonnes (58%) from wastewater in the ship-category RoPax. Approximately 24 tonnes of P is contained in the food waste generated by the ships in the study. Forthcoming regulations over allowed nutrient concentrations in sewage will lead to 80% reduction in P from passenger ships and can reduce about 31 tonnes of P entering the Baltic Sea environment. If both sewage and grey water instead are offloaded in port reception facilities, about 76 tonnes of P-reduction to the sea can be reached. As most phosphorus recovery practices currently only are available on land it is recommended to direct the waste streams to port reception facilities for further treatment ashore.

scholarly journals Phosphorus Recovery and Reuse from Waste Streams

2015 ◽  
pp. 173-250 ◽  
Author(s):  
Rajasekar Karunanithi ◽  
Ariel A. Szogi ◽  
Nanthi Bolan ◽  
Ravi Naidu ◽  
Paripurnanda Loganathan ◽  
...  
Keyword(s):  
Phosphorus Recovery ◽  
Waste Streams ◽  
Recovery And Reuse

scholarly journals Nutrients Recovery From Aquaculture Wastewater Using Thermally Treated Gastropod Shells

2018 ◽  
pp. 60-68
Author(s):  
Adelagun Ruth Olubukola Ajoke
Keyword(s):  
Substrate Material ◽  
Appropriate Technology ◽  
Phosphorus Recovery ◽  
General View ◽  
Recovery Efficiency ◽  
Waste Streams ◽  
Gastropod Shell ◽  
P Recovery ◽  
Aquaculture Wastewater ◽  
Technological Options

Various technological options are currently being assessed towards phosphorus recovery from waste streams. Premised on the development of sustainable appropriate technology, gastropod shell was thermally modified in this study to enhance its sorption capacity as a substrate material for P recovery from aquaculture used water. It was revealed that the thermal treatment impacted enhanced defects in the surficial morphologies of the gastropod shell leading to an increased P recovery efficiency; this was contrary to the general view that high P recovery efficiency of calcined calcium – rich materials was as a result of conversion of CaCO3 to CaO. Furthermore, about 60% P recovery was obtained and a substantial recovery of the total Nitrogen was also achieved. There was a significant improvement in the overall characteristics of the treated used water for safe disposal or reuse.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

Renewable Diesel Blendstocks and Biopriviliged Chemicals Distilled from Algal Biocrude Oil Converted via Hydrothermal Liquefaction

2019 ◽  
Author(s):  
Wan-Ting (Grace) Chen ◽  
Zhenwei Wu ◽  
Buchun Si ◽  
Yuanhui Zhang
Keyword(s):  
Oxidation Stability ◽  
Ash Content ◽  
Hydrothermal Liquefaction ◽  
Fractional Distillation ◽  
Chemical Compositions ◽  
Steam Temperature ◽  
Renewable Diesel ◽  
Commodity Chemicals ◽  
Biocrude Oil ◽  
Specification Analysis

This study aims to produce renewable diesel and biopriviliged chemicals from microalgae that can thrive in wastewater environment. <i>Spirulina</i> (SP) was converted into biocrude oil at 300ºC for a 30-minute reaction time via hydrothermal liquefaction (HTL). Next, fractional distillation was used to separate SP-derived biocrude oil into different distillates. It was found that 62% of the viscous SP-derived biocrude oil can be separated into liquids at about 270ºC (steam temperature of the distillation). Physicochemical characterizations, including density, viscosity, acidity, elemental compositions, higher heating values and chemical compositions, were carried out with the distillates separated from SP-derived biocrude oil. These analyses showed that 15% distillates could be used as renewable diesel because they have similar heating values (43-46 MJ/kg) and carbon numbers (ranging from C8 to C18) to petroleum diesel. The Van Krevelan diagram of the distillates suggests that deoxygenation was effectively achieved by fractional distillation. In addition, GC-MS analysis indicates that some distillates contain biopriviliged chemicals like aromatics, phenols and fatty nitriles that can be used as commodity chemicals. An algal biorefinery roadmap was proposed based on the analyses of different distillates from the SP-derived biocrude oil. Finally, the fuel specification analysis was conducted with the drop-in renewable diesel, which was prepared with 10 vol.% (HTL10) distillates and 90 vol.% petroleum diesel. According to the fuel specification analysis, HTL10 exhibited a qualified lubricity (<520 µm), acidity (<0.3 mg KOH/g) and oxidation stability (>6 hr), as well as a comparable net heat of combustion (1% lower), ash content (29% lower) and viscosity (17% lower) to those of petroleum diesel. Ultimately, it is expected that this study can provide insights for potential application of algal biocrude oil converted via HTL.

Waste Disposal in the Sea off Southern California

1986 ◽  
Vol 18 (11) ◽  
pp. 1-9 ◽  
Author(s):  
Willard Bascom
Keyword(s):  
Waste Water ◽  
Coastal Waters ◽  
Southern California ◽  
State Standards ◽  
Waste Streams ◽  
Cool Water ◽  
Water Research ◽  
The Pacific ◽  
Steady Improvement ◽  
Deep Cool

Southern California, with a coastal population of 12 million people, releases about 4.4 million cubic meters of treated waste water into the Pacific every day via outfalls that discharge three to six kilometers offshore at a depth of 60 meters. Diffusers cause each liter of waste to be diluted by 150 liters of deep cool water preventing it from reaching the surface except for short periods in winter. Data on the constituents of the four largest waste streams are presented and a brief account of the research done by the Southern California Coastal Water Research Project is given. Although the waste water now discharged meets rigorous state standards (with minor exceptions) and the steady improvement in sea conditions over a decade has been well documented, there is a continuing debate over whether our coastal waters are adequately protected. This is primarily because the damaging effects of DDT and PCBs that were discharged more than 14 years ago have been slow to go away. Although the amounts of DDT and PCB in sea animals are only one- tenth what they were a decade ago they tend to obscure the value of the improvements and the present discharge practices. The alternatives to sea disposal seem likely to cause greater damage to the overall environment.

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