scholarly journals Beyond signal quality: The value of unmaintained pH, dissolved oxygen, and oxidation-reduction potential sensors for remote performance monitoring of on-site sequencing batch reactors

2019 ◽  
Vol 161 ◽  
pp. 639-651 ◽  
Author(s):  
Mariane Yvonne Schneider ◽  
Juan Pablo Carbajal ◽  
Viviane Furrer ◽  
Bettina Sterkele ◽  
Max Maurer ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Performance Monitoring ◽  
Reduction Potential ◽  
Signal Quality ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

An ORP screening protocol for biological phosphorus removal in sequencing batch reactors

1995 ◽  
Vol 22 (2) ◽  
pp. 260-269 ◽  
Author(s):  
D. G. Wareham ◽  
K. J. Hall ◽  
D. S. Mavinic
Keyword(s):  
Carbon Storage ◽  
Phosphorus Removal ◽  
Reduction Potential ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Screening Protocol ◽  
Biological Phosphorus

This research discusses two strategies for adding acetate to sequencing batch reactors operating as biological removal (Bio-P) systems. The control (fixed-time) reactor adds the acetate at a set time of 1 h 25 min, which is an assumed time for complete denitrification. The experimental (real-time) reactor adds the acetate when a computer detects the disappearance of nitrates, as indicated by a distinctive "breakpoint" or "kink" in the oxidation-reduction potential versus time profile. This control strategy is therefore based upon a known time for complete denitrification. The time-of-occurrence of the nitrate breakpoint is utilized in the development of a screening protocol for interpreting the behaviour (in terms of nitrate reactions) for reactors operating in biological phosphorus removal mode. The protocol involves categorizing the timing of the nitrate breakpoint into two groupings. A "failure" category corresponds to acetate being added prior to the breakpoint, because, in these cases, the acetate is used partially for denitrification and partially for Bio-P carbon storage. A "success" category corresponds to breakpoints occurring prior to the addition of acetate. In such cases, acetate is used solely for carbon storage by Bio-P organisms. Key words: oxidation-reduction potential, biological phosphorus removal, sequencing batch reactor, real-time computer control.

Real-time process dynamics monitoring in Anammox reactors

2014 ◽  
Vol 70 (2) ◽  
pp. 183-191 ◽  
Author(s):  
B. Alpaslan Kocamemi ◽  
D. Dityapak
Keyword(s):  
Real Time ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Process Dynamics ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Start Up ◽  
Reliable Monitoring ◽  
Phase Conductivity ◽  
Break Points

Process dynamics in Anammox systems were evaluated through continuous monitoring of pH, oxidation reduction potential (ORP) and conductivity in two separate newly started-up sequencing batch reactors, one seeded with an enriched Anammox sludge and the other seeded with mixed activated sludge. The pH and ORP profiles exhibited characteristic patterns depending on the process dynamics during early start-up, start-up and enrichment phases of the operational period of 410 days. The simultaneously continuing processes of the start-up period showed apparent indicative trend lines in pH and ORP profiles. Conductivity profiles were consistent with the process dynamics in all phases. During the enrichment phase, conductivity decreases could quantitatively be related to process removal efficiencies and all real-time profiles exhibited specific break-points which coincided with the end of Anammox in each cycle. The end of Anammox was observed as an ‘apex’ on pH profiles and a ‘valley’ on ORP profiles. The ‘apex’ and ‘valley’ points exactly coincided with the end point of the linear decrease in the conductivity profiles. The overall findings suggested a great potential in using real-time pH, ORP and conductivity measurements for quick and reliable monitoring of Anammox systems during start-up and enrichment periods.

scholarly journals Beyond signal quality: The value of unmaintained pH, dissolved oxygen, and oxidation-reduction potential sensors for remote performance monitoring of on-site sequencing batch reactors

2018 ◽  
Author(s):  
Mariane Yvonne Schneider ◽  
Juan Pablo Carbajal ◽  
Viviane Furrer ◽  
Bettina Sterkele ◽  
Max Maurer ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Reduction Potential ◽  
Batch Reactor ◽  
Soft Sensor ◽  
Small Scale ◽  
Ammonium Oxidation ◽  
Soft Sensors ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Using Data

Sensor maintenance is time-consuming and is a bottleneck for monitoring on-site wastewater treatment systems. Hence, we compare maintained and unmaintained pH, dissolved oxygen (DO), and oxidation-reduction potential (ORP) sensors to monitor the biological performance of a small-scale sequencing batch reactor (SBR). We created soft sensors using engineered features: ammonium valley for pH, oxidation ramp for DO, and nitrite ramp for the ORP. We found that the pH soft sensors are able to reliably identify the completion of ammonium oxidation in the SBR’s effluent even without sensor maintenance for over a year. In contrast, the DO soft sensor using data from a maintained sensor showed slightly better detection performance than that using data from unmaintained sensors, as the DO soft sensor using maintained data is much less sensitive to the optimisation of cut-off frequency and slope tolerance than the soft sensor using unmaintained data. The nitrite ramp provided no useful information on the state of nitrite oxidation, so no comparison of maintained and unmaintained ORP sensors was possible in this case. We identified two hurdles when designing soft sensors for unmaintained sensors: i) Sensors’ type- and design-specific deterioration affects performance. ii) Feature engineering for soft sensors is sensor type specific, and the outcome is strongly influenced by operational parameters such as the aeration rate. In summary, we provide soft sensors that allow the performance of unstaffed small-scale SBRs to be monitored with unmaintained sensors and therefore the maintenance and reliability of OST systems to be optimised.

scholarly journals KEMATIAN MASSAL IKAN DAN SEBARAN PARAMETER KUALITAS AIR DI TELUK JAKARTA

2017 ◽  
Vol 8 (2) ◽  
pp. 77 ◽  
Author(s):  
Masayu Rahmia Anwar Putri ◽  
Sri Turni Hartati ◽  
Fayakun Satria
Keyword(s):  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
Reduction Potential ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Economic Loss ◽  
Suspended Solid ◽  
Water Parameters ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential

Berbagai jenis ikan, dengan bobot total lebih dari 650 kg ditemukan mati di pesisir Pantai Ancol tanggal 30 November 2015, diantaranya yang dominan adalah gulamah (Scianidae). Kematian ikan yang sering terjadi akan menyebabkan kerugian ekonomi yang signifikan. Identifikasi faktor penyebab terjadinya peristiwa ini sangat penting untuk diketahui dalam rangka pengelolaan populasi ikan dan penyusunan tindakan pencegahan sehingga bisa mengurangi frekuensi dan besarnya tingkat kematian ikan. Penelitian ini bertujuan untuk mengetahui sebaran spasial beberapa parameter kualitas airguna mengidentifikasi faktor penyebab kematian masal ikan di Teluk Jakarta yang terjadi pada tanggal 30 November 2015. Pengamatan dilakukan pada tanggal 1-3 Desember 2015 di 14 stasiun penelitian mencakup14 parameter fisika, kimia dan biologi perairan. Sebaran spasial beberapa parameter perairan dipetakan dengan menggunakan software ArcGIS 9.3. Parameter perairan (kedalaman, kecerahan, suhu air, pH, oksigen terlarut dan ORP (Oxidation Reduction Potential)) diukur secara insitu dan contoh air permukaan diambil untuk pengamatan plankton serta parameter kimia air di laboratorium (nitrat, fosfat, ammonia, biochemical oxygen demand, total suspended solid, sulfide dan bahan organik terlarut). Berdasarkan analisa dari 14 parameter fisika, kimia dan biologi perairan diketahui faktor penyebab kematian masal ikan di Teluk Jakarta pada 30 November 2015 disebabkan karena rendahnya kandungan oksigen terlarut(0,07mg/l pada lokasi pusat kematian ikan),kadar nutrien yang berlebihan(nitrat,0,003-0,389 mg/l dan fosfat 0,811-1,653 mg/l,)dan tingginya konsentrasi ammonia yang merupakan gas beracun dan berbau (0,227-1,944 mg/l). On November 30th, 2015, more than 650 kg fishes found dead in the coast of Ancol. The identification of its causes is very vital to develop mitigation for managing fish population and preventing economic loss. This study aims to examine several waters parameters to identify the factors causing mass deaths of fish. The study was conducted on 1-3 December 2015 in Jakarta Bay by analyzing 14 parameters of physical, chemical and biological aspect. Spatial distribution of water parameters mapped using ArcGIS 9.3 software. Some water parameters were measured in situ (depth, brightness, water temperature,pH, dissolved oxygen and ORP (oxidation reduction potential) while surface water samples were taken and analyzed in the laboratory (Nitrate, phosphate, ammonia, biochemical oxygen demand. The result showed that a mass fish kills in Jakarta Bay on 30 November 2015 due to low dissolved oxygen content, release of toxic gas into the water, excessive nutrient and high ammonia.

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