Full-scale bioremediation and long-term monitoring of a phenolic wastewater disposal lake

2010 ◽  
Vol 82 (1) ◽  
pp. 161-173 ◽  
Author(s):  
Ulrich Stottmeister ◽  
Peter Kuschk ◽  
Arndt Wiessner
Keyword(s):  
Disposal Site ◽  
Surface Zone ◽  
Wastewater Disposal ◽  
Color Transparency ◽  
Final Volume ◽  
Phenolic Wastewater ◽  
One Year ◽  
Term Monitoring ◽  
Open Cast

A former open-cast pit was used as the disposal site for wastewater from lignite low-temperature coking processes. The formed lake with a strong stratification had a final volume of 2 × 106 m3. Its water was highly toxic and of dark brownish color (transparency about 3 cm). Traditional remediation methods were too expensive, and it was therefore necessary to develop a new, ecologically and economically acceptable remediation strategy. This strategy is based on a first precipitation step of the dark-brown-colored macromolecules as iron-humate flocs at pH 4.0. These macromolecules are similar to fulvic/humic acid and are formed abiotically by autoxidation of polyphenolic compounds. Thus, the dissolved organic matter (DOM, about 280 mg/l) was decreased by about 50 % and transparency improved. After a neutralization step with 2200 m3 of 20 % calcium carbonate suspension and a subsequent "fertilization" with 0.75 % phosphoric acid (3 × 0.8 m3) "enhanced natural attenuation" was initiated. Due to higher transparency, intense growth of algae ("blooming") and bacteria started in the upper zone of the lake. In winter, algae sedimented and one year after the precipitation step, the water of the surface zone was almost clear (transparency 1 m, after 10 years over 3 m) and odorless.

scholarly journals ENVIRONMENTAL POLLUTION BY WASTEWATER FROM BROWN COAL PROCESSING ¬ A REMEDIATION CASE STUDY IN GERMANY

2014 ◽  
Vol 22 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Arndt Wiessner ◽  
Jochen A. Müller ◽  
Peter Kuschk ◽  
Uwe Kappelmeyer ◽  
Matthias Kästner ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Large Scale ◽  
Pilot Scale ◽  
Wastewater Disposal ◽  
Interdisciplinary Approaches ◽  
Phenolic Wastewater ◽  
Term Monitoring

The large scale of the contamination by the former carbo-chemical industry in Germany requires new and often interdisciplinary approaches for performing an economically sustainable remediation. For example, a highly toxic and dark-colored phenolic wastewater from a lignite pyrolysis factory was filled into a former open-cast pit, forming a large wastewater disposal pond. This caused an extensive environmental pollution, calling for an ecologically and economically acceptable strategy for remediation. Laboratory-scale investigations and pilot-scale tests were carried out. The result was the development of a strategy for an implementation of full-scale enhanced in situ natural attenuation on the basis of separate habitats in a meromictic pond. Long-term monitoring of the chemical and biological dynamics of the pond demonstrates the metamorphosis of a former highly polluted industrial waste deposition into a nature-integrated ecosystem with reduced danger for the environment, and confirmed the strategy for the chosen remediation management.

CFRP Strengthening and Long-Term Monitoring of an Old Metallic Roadway Bridge in Melbourne

2019 ◽  
Author(s):  
Elyas Ghafoori ◽  
Ardalan Hosseini ◽  
Riadh Al-Mahaidi ◽  
Xiao-Ling Zhao ◽  
Masoud Motavalli ◽  
...  
Keyword(s):  
Maximum Tensile Stress ◽  
Before And After ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Short And Long Term ◽  
Heavy Truck ◽  
Long Term Monitoring ◽  
One Year ◽  
Term Monitoring

<p>This study gives an overview on carbon fibre-reinforced polymer (CFRP) strengthening and wireless sensor network (WSN) monitoring of a 121-year-old metallic roadway bridge in Melbourne, Australia. A flat prestressed unbonded retrofit (FPUR) system was developed to apply prestressed CFRP plates to the steel cross-girders of Diamond-Creek Bridge. The bridge is subjected to daily passenger and heavy truck vehicles. Sets of laboratory tests were performed to examine the efficiency and fatigue performance of the proposed FPUR system, prior to its installation on the bridge. Furthermore, in order to demonstrate the efficiency of the proposed retrofit technique, the bridge was instrumented with different types of sensors (including strain gauges, temperature and humidity sensors), and short- and long-term measurements were performed. As for short-term measurements, the bridge was loaded by a 42.5-tonne semi-trailer before and after strengthening. For the long-term monitoring, a WSN system was used to monitor the prestress level in the CFRP reinforcements for at least one year. The CFRP plates were prestressed up to about 980 MPa (38% of the CFRP ultimate strength), which resulted in about 50% reduction in the maximum tensile stress in the bottom flanges of the strengthened I-girders. The results of the short- and long-term measurements in this study showed that the proposed FPUR system can be very effective for flexural and fatigue strengthening of such bridge girders.</p>

Long-term monitoring of an invasion process: the case of an isolated small wetland on a Mediterranean Island, second stage: toward a complete restoration

Biologia ◽  
2014 ◽  
Vol 69 (8) ◽  
Author(s):  
Bruno Foggi ◽  
Renato Benesperi ◽  
Daniele Viciani ◽  
Michele Giunti ◽  
Lorenzo Lastrucci
Keyword(s):  
Invasion Process ◽  
Second Stage ◽  
Complete Restoration ◽  
Mediterranean Island ◽  
One Year ◽  
The Moment ◽  
Short Time ◽  
Term Monitoring ◽  
Small Wetland

AbstractIn the present article, the results of the first-stage of monitoring, following restoration works on a small Mediterranean wetland (Lake Stagnone, Capraia Island, Tuscan Archipelago), are reported. The recent spread of Typha and Phragmites in the lake changed diversity and composition of the plant communities. Nine years after their first monitoring (2009), a rarefaction of hydrophytes and small helophytes of conservation interest was detected. In 2010, the restoration started with the aim to remove (or at least reduce) the populations of the large, expansive helophytes. In 2012, the first post-actions monitoring were carried out using the same methods as previously, analysing the plant presence/absence and their cover value recorded in the same 15 plots selected in 2000 and 2009. The rise and fall of the populations of the various flora and vegetation types during this invasion process and the following restoration were statistically analysed. One year following the restoration, some recovery (replacement) had occurred of autochthonous hydrophytes and small helophytes. Many of these species are of conservation interest. Some aquatic plants, present on the site until the more or less recent past, were once more recorded. Given the rapid recovery of populations of many autochthonous species, the results are reasonably encouraging, rendering planned reintroductions unnecessary at the moment. On the other hand, because of the short time elapsed since restoration, the current community structure cannot in any way be considered an “equilibrium” one. Continued and regular monitoring is required to allow the reestablishment of the large expansive helophytes populations.

Periodicity of the outbreaks of the carrot psyllid (Trioza apicalis) cannot be explained by sunspot activity

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Pavel Láska ◽  
Jan Rogl
Keyword(s):  
Climatic Conditions ◽  
Sunspot Activity ◽  
Long Term Monitoring ◽  
One Year ◽  
Term Monitoring ◽  
Term Fluctuation

AbstractThe periodicity of the fluctuations in the attacks of the carrot psyllid Trioza apicalis in long-term monitoring was studied by analysis of data of previous authors. The occurence of only one generation in the year shows that peaks of attack cannot arise suddenly in one year, but are prolonged over several years, as are the troughs of attack. This is the cause of the long-term fluctuation, which seems to be periodic. The statement of Ozols, that the period of the fluctuations of carrot psyllid was connected with climatic conditions via sunspot activity, was not evident statistically.

scholarly journals The culprit of cryptogenic stroke: the short-term versus long-term atrial fibrillation detection rate in a tertiary care centre

EP Europace ◽  
2021 ◽  
Vol 23 (Supplement_3) ◽  
Author(s):  
F Wouters ◽  
P Vandervoort ◽  
D Mesotten ◽  
D Verhaert ◽  
J Vranken ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Stroke Unit ◽  
Detection Rate ◽  
Cryptogenic Stroke ◽  
Smartphone Application ◽  
Short Term ◽  
Long Term Monitoring ◽  
One Year ◽  
Term Monitoring

Abstract Funding Acknowledgements Type of funding sources: Public Institution(s). Main funding source(s): Limburg Clinical Research Center OnBehalf Mobile Health Unit & Future Health Background Cryptogenic stroke (CS) and transient ischemic attack (TIA) patients have no determined aetiology at discharge. A possible cause for stroke is atrial fibrillation (AF). AF occurs in 20%-40% of the CS patients and diagnosis is highly dependent on monitoring duration. A long-term monitoring method is the insertable loop recorder (ILR), recommended by the European Society of Cardiology. However, this is not routinely used in Belgium despite reimbursement. Purpose This study aims to determine the AF detection rates of different methods used in clinical practice, ranging from short-term monitoring (monitoring in a stroke unit, 12-lead electrocardiogram (ECG), and 24-hour ECG), seven-day Holter, and long-term monitoring (smartphone application and ILR). Methods A monocentric, retrospective study was conducted in adults with CS or TIA between 1/01/17 - 1/01/20. Data were collected from the electronic medical record. The primary endpoint was the detection rate and time until first AF detection. Results A total of 368 patients suffered from a CS or TIA. Most of them were monitored in the stroke unit (96%) or with a 12-lead ECG (93%). A 24-hour ECG was used in 26%, a seven-day Holter in 38%. For long-term monitoring, a smartphone application was used in 3%. ILRs were inserted in 6%, with a median time of 102 days after stroke (IQR: 48-321). One year after ILR insertion, AF was detected in 23%. AF detection increased with monitoring duration, as shown in the figure, except for 24-hour ECG, which detected no AF. Therefore, the AF detection rate was different between short-term monitoring (5%)  and seven-day Holter (10%; p=.034), and short- and long-term monitoring (16%; p=.01). The age of CS patients without AF (Mdn = 71yr) was lower than those with AF (Mdn = 79yr; p=.001). The National Institutes of Health Stroke Scale (NIHSS) and the CHA2DS2-VASc score of patients without AF (Mdn = 3) was lower than those with AF (Mdn = 6, p&lt;.001; Mdn = 4, p=.004 respectively). The one-year mortality of patients with AF was 15% compared to 8% for patients without AF. No patients with an ILR deceased within one year after the stroke. Conclusions Detection of AF was associated with higher age, NIHSS, and CHA2DS2-VASc scores. These variables can be used to select patients for the insertion of ILRs. The detection rate of AF was significantly higher with long-term monitoring and seven-day Holter compared to short-term monitoring. However, only 38% of the patients were monitored for a week, and only 6% had an ILR inserted. Therefore, despite guideline recommendations, long-term cardiac monitoring is underutilised in this population of CS patients. Nevertheless, AF was still detected in 14% of CS patients within one year after the stroke. These findings emphasise the need for more monitoring with a seven-day Holter, smartphone app, and ILR in this patient population. Consequently, this will result in more accurate treatment of AF as secondary prevention of CS. Abstract Figure. Time to first AF detection after stroke

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