scholarly journals Effects on nitrogen and phosphorus distribution in interstitial water and sediment-water nitrogen and phosphorus release with growing of submerged macrophytes

2006 ◽  
Vol 18 (5) ◽  
pp. 515-522 ◽  
Author(s):  
BAO Xianming ◽  
◽  
CHEN Kaining ◽  
FAN Chengxin
Keyword(s):  
Interstitial Water ◽  
Submerged Macrophytes ◽  
Phosphorus Release ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Distribution ◽  
Water And Sediment

scholarly journals Changes in the concentration of selected metals in sediments of the River Chotla in northwest Poland in its section affected by various anthropogenic factors

2015 ◽  
Vol 15 (2) ◽  
pp. 77-82
Author(s):  
Małgorzata Włodarczyk ◽  
Hanna Siwek ◽  
Anna Buchwał ◽  
Edyta Rafacz
Keyword(s):  
Bottom Sediment ◽  
Interstitial Water ◽  
Anthropogenic Factors ◽  
Alkaline Ph ◽  
River Section ◽  
Water And Sediment ◽  
Fish Breeding ◽  
Accumulation Of Metals ◽  
Water Accumulation ◽  
The Village

Abstract The purpose of the paper was to assess the changes in the concentration of selected metals in the bottom sediment and interstitial water of the River Chotla in northwest Poland. The research was conducted on the river section flowing through Zaspy Małe and a salmonid fish breeding farm. Samples of water and bottom sediment were taken in four control and measurement points, located above and below the village and on a backwater above the trouteries and below the fish breeding ponds. The pH and the concentration of the metals potassium, iron, calcium, manganese and zinc were determined in the water and sediment samples. The lowest concentrations of the metals were found in the samples collected above and below Zaspy Małe, while the highest concentrations of metals in the water and sediment were found in the samples taken in the backwater, above the fish breeding ponds. Exceptions were calcium and potassium, with the highest concentrations of metals in the water being found in the samples taken below the fish breeding ponds. The content of metals in sediments of the analysed section of the River Chotla was mainly determined by the content of organic matter, which varied as it is dependent on water accumulation processes and the operation of nearby fishery facilities. The slightly alkaline pH facilitated long-lasting accumulation of metals in sediments.

Simultaneous Removal of Nitrogen and Phosphorus in Intermittently Aerated 2-Tank Activated Sludge Process Using DO and ORP-Bending-Point Control

1993 ◽  
Vol 28 (11-12) ◽  
pp. 513-521 ◽  
Author(s):  
Kousei Sasaki ◽  
Yasuji Yamamoto ◽  
Kazushi Tsumura ◽  
Shigeru Hatsumata ◽  
Masahiro Tatewaki
Keyword(s):  
Control System ◽  
Activated Sludge ◽  
Phosphorus Uptake ◽  
Material Balance ◽  
Phosphorus Release ◽  
Test Plant ◽  
Activated Sludge Process ◽  
Time Sharing ◽  
Nitrogen And Phosphorus ◽  
Time Control

The 2-tank intermittent aeration method is an anaerobic-aerobic activated sludge process of time-sharing type in which 2 complete mixing reaction tanks are connected in series, and aeration and agitation are periodically repeated in each tank. We have developed a new control system for the process which can secure anaerobic, anoxic and aerobic conditions through a combination of DO and ORP-Bending-point (corresponding to termination of denitrification) emergence time control. In the 1st tank, nitrification and phosphorus uptake occur in the aeration period, followed by denitrification and phosphorus release in the agitation. The 2nd tank performs nitrification and phosphorus uptake in the aeration and denitrification in the agitation. One cycle of aeration and agitation is approximately 2 hours. This control system was applied to the test plant (influent flow rate: 225 I/day) for two months under the conditions of HRT 16 hours and temperature 20 ±2 °C. We achieved stable and high removal ratios: TOC 94.9 %, T-N 89.4 %, and T-P 95.5 %. We also investigated the mechanisms of nitrogen and phosphorus removal and their material balance.

scholarly journals Nitrogen and phosphorus in cascade multi-system tropical reservoirs: water and sediment

2017 ◽  
Vol 17 (3) ◽  
pp. 133-150 ◽  
Author(s):  
Marcelo Pompêo ◽  
Viviane Moschini-Carlos ◽  
Julio Cesar López-Doval ◽  
Natália Abdalla-Martins ◽  
Sheila Cardoso-Silva ◽  
...  
Keyword(s):  
Sediment Quality ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sao Paulo ◽  
São Paulo ◽  
Nitrogen And Phosphorus ◽  
Paulo State ◽  
Tropical Reservoirs ◽  
Water And Sediment ◽  
Main Compartment

AbstractThe aim of this research was to analyze the horizontal spatial heterogeneity of both water and superficial sediment quality among and within the reservoirs of the Cantareira System (CS), focusing on concentrations of N and P, attributed to the dumping of raw domestic sewage into water bodies, which is the main cause of water pollution in São Paulo State (Brazil). The CS is a multi-system complex composed of five interconnected reservoirs, with water transported by gravity through 48 km of tunnels and channels. From the last reservoir of the CS, with an output of 33 m3s−1, the water is conducted to a water treatment plant, producing half of the water consumed by 19 million people inhabiting São Paulo city. The upstream reservoirs are more eutrophic than the downstream ones. Data also suggest that the low phytoplankton biomass (ranging from 0.9 to 14.4 μg dm−3) is regulated by the low nutrient availability, mainly of phosphorus (TP ranging from below the detection limit, <9.0 μg dm−3, to 47.3 μg dm−3). For water, the DIN/TP ratios values range from 19 to 380. The upstream reservoirs function as nutrient accumulators and the sediment is the main compartment in which P and N are stored. Although the reservoirs are located in different river basins and are not in sequence along the same river, the results suggest a marked gradient between the reservoirs, with features similar to those of cascade reservoirs. The large volumes flowing through the canals and tunnels could explain the observed pattern. The CS reservoirs can therefore be considered multi-system reservoirs in cascade, constituting a particular case of multi-system reservoirs.

Comparative interstitial water and sediment chemistry in oligotrophic and mesotrophic lakes, Maine, U.S.A.

1975 ◽  
Vol 19 (1) ◽  
pp. 367-371
Author(s):  
Dennis R. Sasseville ◽  
Stephen A. Norton ◽  
Ronald B. Davis
Keyword(s):  
Interstitial Water ◽  
Sediment Chemistry ◽  
Water And Sediment

Nitrogen and Phosphorus Release from Decomposing Leaves under Sub-Humid Tropical Conditions1

Biotropica ◽  
2001 ◽  
Vol 33 (2) ◽  
pp. 229
Author(s):  
A. B. Kwabiah ◽  
N. C. Stoskopf ◽  
R. P. Voroney ◽  
C. A. Palm
Keyword(s):  
Phosphorus Release ◽  
Nitrogen And Phosphorus

A novel wastewater treatment process: simultaneous nitrification, denitrification and phosphorus removal

2004 ◽  
Vol 50 (10) ◽  
pp. 163-170 ◽  
Author(s):  
R.J. Zeng ◽  
R. Lemaire ◽  
Z. Yuan ◽  
J. Keller
Keyword(s):  
Phosphorus Removal ◽  
Batch Reactor ◽  
Phosphorus Release ◽  
Gas Analysis ◽  
Simultaneous Nitrification And Denitrification ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Wastewater Treatment Process ◽  
Nitrification And Denitrification

Simultaneous nitrification and denitrification (SND) via the nitrite pathway and anaerobic–anoxic enhanced biological phosphorus removal (EBPR) are two processes that can significantly reduce the COD demand for nitrogen and phosphorus removal. The combination of these two processes has the potential of achieving simultaneous nitrogen and phosphorus removal with a minimal requirement for COD. A lab-scale sequencing batch reactor (SBR) was operated in alternating anaerobic–aerobic mode with a low dissolved oxygen concentration (DO, 0.5 mg/L) during the aerobic period, and was demonstrated to accomplish nitrification, denitrification and phosphorus removal. Under anaerobic conditions, COD was taken up and converted to polyhydroxyalkanoates (PHA), accompanied with phosphorus release. In the subsequent aerobic stage, PHA was oxidized and phosphorus was taken up to less than 0.5 mg/L at the end of the cycle. Ammonia was also oxidised during the aerobic period, but without accumulation of nitrite or nitrate in the system, indicating the occurrence of simultaneous nitrification and denitrification. However, off-gas analysis found that the final denitrification product was mainly nitrous oxide (N2O) not N2. Further experimental results demonstrated that nitrogen removal was via nitrite, not nitrate. These experiments also showed that denitrifying glycogen-accumulating organisms rather than denitrifying polyphosphate-accumulating organisms were responsible for the denitrification activity.

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