Anthropogenic changes to a billabong in New South Wales. 1. Lagoon evolution and phosphorus dynamics

1999 ◽  
Vol 50 (7) ◽  
pp. 689 ◽  
Author(s):  
T. H. Donnelly ◽  
P. W. Ford ◽  
D. McGregor ◽  
D. Allen
Keyword(s):  
Algal Blooms ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Main Process ◽  
Anthropogenic Changes ◽  
P Adsorption ◽  
South Wales ◽  
The Mean

Anthropogenic changes detected in the sediment of a shallow (~1.6 m) billabong (Horseshoe Lagoon) are the result of a Sewage Treatment Plant (STP) connection in 1958 and catchment urbanization around 1974. Nutrient-rich water caused the collapse of macrophyte populations, algal blooms became common, and urbanization increased sediment deposition (~1 cm year −1 ). Changes in P retention were investigated by using dated cores, pore-water element profiles, and water quality records. The lagoon is the last of three STP holding ponds. Ponds 1 and 2 were sand-mining pits; they receive no sediment input and have negligible P adsorption. The Fe:P ratios in sediments from three Australian rivers have a common slope and this relationship was used to examine Fe:P ratios in the anoxic bottom sediments of the lagoon. A potential for effluent P adsorption developed in the lagoon through Fe mobilization and enrichment in the upper sediments and a strong clay–Fe–P association. The mean long- term P adsorption in the lagoon (35±18%) was the result of maintaining clay input to an oxic waterbody. Bacterial sulfate reduction is the main process decreasing available Fe for effluent P adsorption. Appropriately designed systems could expect to maintain effluent P adsorption efficiencies of around 70%.

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.

scholarly journals A Case Study on the Electricity Generation Using a Micro Gas Turbine Fuelled by Biogas from a Sewage Treatment Plant

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2424 ◽  
Author(s):  
Chia-Chi Chang ◽  
Manh Van Do ◽  
Wei-Li Hsu ◽  
Bo-Liang Liu ◽  
Ching-Yuan Chang ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Gas Turbine ◽  
Electricity Generation ◽  
Greenhouse Gas Emission ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Micro Gas Turbine ◽  
Power Load

Combined heat and power production from biogas is now playing an important role in energy and resource utilization as well as pollution control in waste water treatment. This research used biogas from the Bali Sewage Treatment Plant in New Taipei City, Taiwan, as a major source of fuel for the electricity generation. A micro gas turbine electricity generator, Capstone CR-30, which possesses a maximum rated power load (PWL) of 30 kW, was equipped to convert biogas into electricity. The biogas is mainly composed of CH4 (56.1 ± 8.0 vol.%), CO2 (25.5 ± 9.8 vol.%), H2 (0.5 vol.%), and H2S (0.99 ± 0.07 ppmv). During the test operation period of the generator, it was found that the thermal efficiency increases from 19.8% to 23.4% kWhe/kWhth, while the electricity generation efficiency (ηEB) also rises from 0.93 to 1.09 kWhe/m3 biogas as the PWL increases from 10 kW to 30 kW. The results indicated that the generator has a better performance with higher PWL. At PWL = 30 kW, the average adjusted concentrations of CO and NOx (adjusted to 15 vol.% O2) emitted from the generator are 86 ppmv and 17 ppmv, respectively. Both are much lower than the emission standards of stationary sources in Taiwan of 2000 ppmv and 150 ppmv, respectively. Thus, PWL of 30 kW was selected in cooperation with biogas inflow = 0.412 m3/min and air/fuel ratio (i.e., air/biogas ratio) = 76.0 vol./vol. for the long-term regular operation. At the above setting conditions for long-term operation, the generator continuously consumed the biogas and provided stable electricity generation at a rate of 19.64 kWhe/h for a 2-year running period. Moreover, the greenhouse gas can be cut off with a rate of 10.78 kg CO2e/h when using biogas as fuel for electricity generation. Overall, this research proves that the application of a micro gas turbine electricity generator not only has promising performance for using biogas but also gives a significant reduction of greenhouse gas emission, which fits the concepts of the circular economy and environmental protection.

CHANGES IN WATER QUALITY AND FISHERY PRODUCTION IN JINHAE BAY

2017 ◽  
Author(s):  
Kyunghoi Kim ◽  
Kyunghoi Kim ◽  
Oh Seok Jin ◽  
Oh Seok Jin ◽  
In-Cheol Lee ◽  
...  
Keyword(s):  
Water Quality ◽  
Red Tide ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Intertidal Flat ◽  
Sea Bed ◽  
Fish Catch ◽  
Jinhae Bay

For the better understanding of long-term variations of water quality in Jinhae Bay after establishment of special law, we analyzed the archive data monitored in Jinhae Bay during the last 17 years (1997-2013). And change on fish catch due to the variations of water quality was investigated. A marked decrease in the number of red tide occurrence is due to the effectiveness of the law and sewage treatment plant that has targeted the reduction of COD in the effluent water since early 2000. Although the improvement of water quality, increase in fishery production was not observed in Jinhae Bay. For the recovery of fishery production, processes for restoration of entire ecosystem such as restoration of artificial intertidal flat and seaweed bed and remediation of organic-rich sea bed should be accompanied with improvement of water quality.

A Stochastic Model for Primary Settlers

1970 ◽  
Vol 5 (1) ◽  
pp. 129-170
Author(s):  
D.P. Singh ◽  
A.W. Bryson ◽  
P.L. Silveston
Keyword(s):  
Stochastic Model ◽  
Stochastic Models ◽  
Suspended Solids ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Second Order ◽  
Order Model ◽  
First Order ◽  
The Mean

Abstract Stochastic models of process units are useful where the flow and concentrations in a feed stream vary appreciably over long time periods in a random way. Models yield not only the mean, but provide a measure of the variation around the mean. Assuming sedimentation can be described by a rate equation, stochastic models are developed for zero, first and second order rate processes. The zero order model can be rejected because it cannot be made to fit plant data, while the second order model was not developed further because of its complexity. The rate parameter for the first order model was evaluated from 1968 suspended solids data for the Kitchener Sewage Treatment Plant and found to have zero variance. Testing the model against 1966 and 1967 data and shorter period for 1968 showed that the model predicted suspended solids and BOD removals differing on the average from plant results by 10%. The first order stochastic model gives, thus, a satisfactory representation of primary settler performance.

scholarly journals Arcobacter cryaerophilusand thermophilic campylobacters in a sewage treatment plant in Italy: two secondary treatments compared

1993 ◽  
Vol 110 (3) ◽  
pp. 633-639 ◽  
Author(s):  
S Stampi ◽  
O Varoli ◽  
F Zanetti ◽  
G De Luca
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Most Probable Number ◽  
Tertiary Treatment ◽  
Probable Number ◽  
Urban Sewage ◽  
Thermophilic Campylobacter ◽  
The Mean

SUMMARYMicroaerophilic organisms were monitored in sewage effluent undergoing two secondary treatments: air and oxygen-activated sludge. The mean numbers ofArcobacter cryaerophilusand thermophilic campylobacters detected in incoming sewage were 5639/100 ml and 1720/100 ml respectively.Secondary treatment in air tanks reduced the population ofA. cryaerophilusby 97.1% and of thermophilic campylobacters by 99.08%, whereas treatment in oxygen tanks reduced the bacteria 97.8% and 99.63% respectively, showing that oxygen-activated sludge treatment was more effective. Subsequent tertiary treatment with 2 p.p.m. chlorine dioxide evidenced the removal ofA. cryaerophilusto 99.9% and eliminated thermophilic campylobacters.Campylobacter jejuniandC. coliconstituted 54.1% and 45.9% of 74 thermophilic campylobacter strains isolated. In air-activated sludge effluentC. jejuniwas found more often, thus appearing more sensitive to oxygen.The most probable number assay used for detection of campylobacters, blood medium for enrichment and blood-free medium for plating, also appeared to be fit forA. cryaerophilus, the high density of which in urban sewage may be due to inflows from slaughterhouses.

scholarly journals Ecological Processes Affecting Long-Term Eukaryote and Prokaryote Biofilm Persistence in Nitrogen Removal from Sewage

Genes ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 449 ◽  
Author(s):  
Inga Leena Angell ◽  
Linda Bergaust ◽  
Jon Fredrik Hanssen ◽  
Else Marie Aasen ◽  
Knut Rudi
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Abundant Species ◽  
Ecological Processes ◽  
Terminal Electron Acceptor ◽  
Factors Affecting

The factors affecting long-term biofilm stability in sewage treatment remain largely unexplored. We therefore analyzed moving bed bioreactors (MBBRs) biofilm composition and function two years apart from four reactors in a nitrogen-removal sewage treatment plant. Multivariate ANOVA revealed a similar prokaryote microbiota composition on biofilm carriers from the same reactors, where reactor explained 84.6% of the variance, and year only explained 1.5%. Eukaryotes showed a less similar composition with reactor explaining 56.8% of the variance and year 9.4%. Downstream effects were also more pronounced for eukaryotes than prokaryotes. For prokaryotes, carbon source emerged as a potential factor for deterministic assembly. In the two reactors with methanol as a carbon source, the bacterial genus Methylotenera dominated, with M. versatilis as the most abundant species. M. versatilis showed large lineage diversity. The lineages mainly differed with respect to potential terminal electron acceptor usage (nitrogen oxides and oxygen). Searches in the Sequence Read Archive (SRA) database indicate a global distribution of the M. versatilis strains, with methane-containing sediments as the main habitat. Taken together, our results support long-term prokaryote biofilm persistence, while eukaryotes were less persistent.

scholarly journals Marine monitoring along the eastern coastal area of the Island of Lesvos, Greece during 2004 in the Framework of MEDPOL III

2013 ◽  
Vol 9 (2) ◽  
pp. 83-97
Keyword(s):  
Marine Environment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phase Iii ◽  
Eastern Coast ◽  
Marine Monitoring ◽  
The City ◽  
Term Monitoring

The present survey was carried out in the framework of MEDPOL Phase III (2004 – 2006), aiming to provide recent information for the long-term monitoring of pollution trends in selected susceptible marine environments along the Mediterranean coastline. Information was collected from a network of four stations spaced out along the eastern coast of the Island of Lesvos, Greece, including a high risk station near the harbour of the city of Mytilini. Pollutants in abiotic components of the marine environment (seawater, sediment) as well as in selected marine organisms (M. barbatus and B. boops) were measured. It was found that there is no evidence of substantial pollution of the marine environment (seawater, sediment and fish) with respect to the pollutants measured. However, it was shown that although the uncontrolled discharge of untreated effluents has been reduced since the beginning of the operation of the Mytilini sewage treatment plant in 2001, sediments near the harbour of the city still carry increased loads of metals of anthropogenic origin. Furthermore, the small quantity of untreated sewerage that still flows out in the harbour of the city seems to affect water quality, since a higher mesotrophic character with eutrophic trends was observed in the area.

CHANGES IN WATER QUALITY AND FISHERY PRODUCTION IN JINHAE BAY

2017 ◽  
Author(s):  
Kyunghoi Kim ◽  
Kyunghoi Kim ◽  
Oh Seok Jin ◽  
Oh Seok Jin ◽  
In-Cheol Lee ◽  
...  
Keyword(s):  
Water Quality ◽  
Red Tide ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Intertidal Flat ◽  
Sea Bed ◽  
Fish Catch ◽  
Jinhae Bay

For the better understanding of long-term variations of water quality in Jinhae Bay after establishment of special law, we analyzed the archive data monitored in Jinhae Bay during the last 17 years (1997-2013). And change on fish catch due to the variations of water quality was investigated. A marked decrease in the number of red tide occurrence is due to the effectiveness of the law and sewage treatment plant that has targeted the reduction of COD in the effluent water since early 2000. Although the improvement of water quality, increase in fishery production was not observed in Jinhae Bay. For the recovery of fishery production, processes for restoration of entire ecosystem such as restoration of artificial intertidal flat and seaweed bed and remediation of organic-rich sea bed should be accompanied with improvement of water quality.

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