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Mr. Daneish Despot
TU Berlin

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Research Keywords & Expertise

0 Urban Drainage
0 Environmental systems modeling and analysis
0 Environmental monitoring and modelling
0 Sewer processes
0 Hydroinformatics, data-driven modelling

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Journal article
Published: 05 July 2021 in Water
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Hydrogen sulfide (H2S) related to wastewater in sewer systems is known for causing significant problems of corrosion and odor nuisance. Sewer systems severely affected by H2S typically rely on online H2S gas sensors for monitoring and control. However, these H2S gas sensors only provide information about the H2S emission potential at the point being monitored, which is sometimes inadequate to design control measures. In this study, a comparison of three market-ready online sensors capable of liquid-phase H2S detection in sewer systems was assessed and compared. Two of the three sensors are based on UV/Vis spectrophotometry, while the other adapted the design and principles of a Clark-type electrochemical microsensor. The H2S measurements of the sensors were statistically compared to a standard laboratory method at first. Following that, the performance of the online sensors was evaluated under realistic sewer conditions using the Berlin Water Company (BWB) research sewer pilot plant. Test applications representing scenarios of typical H2S concentrations found in sulfide-affected sewers and during control measures were simulated. The UV/Vis spectrometers showed that the performance of the sensors was highly dependent on the calibration type and measurements used for deriving the calibration function. The electrochemical sensor showed high sensitivity by responding to alternating anaerobic/anoxic conditions simulated during nitrate dosing. All sensors were prone to measurement disturbances due to high amounts of sanitary solids in wastewater at the study site and required continuous maintenance for reliable measurements. Finally, a summary of the key attributes and limitations of the sensors compared for liquid phase H2S detection is outlined.

ACS Style

Daneish Despot; Micaela Pacheco Fernández; Matthias Barjenbruch. Comparison of Online Sensors for Liquid Phase Hydrogen Sulphide Monitoring in Sewer Systems. Water 2021, 13, 1876 .

AMA Style

Daneish Despot, Micaela Pacheco Fernández, Matthias Barjenbruch. Comparison of Online Sensors for Liquid Phase Hydrogen Sulphide Monitoring in Sewer Systems. Water. 2021; 13 (13):1876.

Chicago/Turabian Style

Daneish Despot; Micaela Pacheco Fernández; Matthias Barjenbruch. 2021. "Comparison of Online Sensors for Liquid Phase Hydrogen Sulphide Monitoring in Sewer Systems." Water 13, no. 13: 1876.

Journal article
Published: 08 April 2021 in Water
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Sulphide build-up in pressure sewers has been identified as the main cause for the occurrence of odour and corrosion in sewer systems. Despite the efforts to optimize commonly used control technologies such as nitrate and iron salts to reduce sulphide emission, continuous addition of these chemicals is still required. A biocidal agent such as free nitrous acid can be added intermittently, less frequently, and in smaller quantities whilst achieving total sulphide control. So far, laboratory and field studies in Australia and the USA have successfully proven and applied the use of this control technology, exhibiting its strong biocidal effects during intermittent addition. In this study, nine trials were made to assess the application of the free nitrous acid (FNA) as an alternative sulphide control technology in Germany. The sewer pilot plant of the Berlin Water Utility Company was used to perform the trials at a technical scale using a supply of raw sewage. FNA exposure times ranging from 5 to 24 h in varying concentrations were investigated. The effectiveness of the FNA treatment was monitored using the online hydrogen sulphide (H2S) gas and dissolved-sulphide sensors installed in the sewer pilot plant. Effective sulphide control was only possible during dosing periods, with rapid resumption of sulphide production for the trials with exposure times of <12 h and concentrations ranging from 0.08 to 0.56 mg HNO2-N L−1 suggesting a slight inhibitory effect. A more pronounced biocidal effect was observed for the trials exposed to FNA treatment for 24 h at concentrations >0.29 mg HNO2-N L−1. Overall, the trials of this study demonstrated that the biofilms were FNA resistant and that the concentrations and exposure times used were inadequate to develop an effective intermittent dosing strategy.

ACS Style

Daneish Despot; Luisa Reinhold; Adrian Augustyniak; Matthias Barjenbruch. Dosing Free Nitrous Acid as an Alternative Sulphide Control Technology for Pressure Sewers in Germany. Water 2021, 13, 1015 .

AMA Style

Daneish Despot, Luisa Reinhold, Adrian Augustyniak, Matthias Barjenbruch. Dosing Free Nitrous Acid as an Alternative Sulphide Control Technology for Pressure Sewers in Germany. Water. 2021; 13 (8):1015.

Chicago/Turabian Style

Daneish Despot; Luisa Reinhold; Adrian Augustyniak; Matthias Barjenbruch. 2021. "Dosing Free Nitrous Acid as an Alternative Sulphide Control Technology for Pressure Sewers in Germany." Water 13, no. 8: 1015.