Samples were monitored for soluble reactive phosphate (SRP), volatile fatty acids (VFAs), nitrate (NO3), mixed-liquor suspended solids (MLSS), glycogen, PHA, and glycerol as described in Coats et al. (2015) (link). Measurement of pH was accomplished with a Thermo-Fisher Scientific Accumet AP85 Waterproof pH/Conductivity Meter. DO measurements were collected using a Hach HQ30d Meter with a LDO101 DO Probe.
Hq30d meter
Manufactured by HACH
Sourced in Canada, United States
The HQ30d meter is a portable, handheld device designed for measuring various water quality parameters. It features a digital display and supports a range of interchangeable electrodes to measure parameters such as pH, conductivity, dissolved oxygen, and other water quality indicators. The HQ30d meter is a versatile tool for field and laboratory applications requiring accurate water quality measurements.
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Lab products found in correlation
3 protocols using hq30d meter
1
Monitoring of Wastewater Treatment Parameters
2
Wastewater Characterization and Analysis
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In situ reactor dissolved oxygen (DO), temperature, and pH were measured using LDO101 and PHC101 probes connected to a portable HQ30d meter (HACH, London, ON, Canada). Total solids (TS), volatile solids (VS), total suspended solids (TSS), and volatile suspended solids (VSS) were analyzed per APHA Section 5210B and Section 2540, as appropriate [19 ]. Samples were filtered using 0.45-micron glass Whatman filter papers.
HACH method 8000 was used for chemical oxygen demand (COD). A Shimadzu TOC-500A (Shimadzu, Columbia, MD, United States) analyzer was used for total organic carbon (TOC). A Skalar SAN Plus 3000/5000 Segmented Flow Analyzer (Skalar Analytical B.V., Breda, Netherlands) was used for total ammonia nitrogen (TAN) (method 155–324 w/r), total phosphorus (TP), and ortho-phosphate phosphorus (PO4-P) (method 503–324 w/r).
HACH method 8000 was used for chemical oxygen demand (COD). A Shimadzu TOC-500A (Shimadzu, Columbia, MD, United States) analyzer was used for total organic carbon (TOC). A Skalar SAN Plus 3000/5000 Segmented Flow Analyzer (Skalar Analytical B.V., Breda, Netherlands) was used for total ammonia nitrogen (TAN) (method 155–324 w/r), total phosphorus (TP), and ortho-phosphate phosphorus (PO4-P) (method 503–324 w/r).
3
Comprehensive Wastewater Characterization
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Total chemical oxygen demand, nitrogen and phosphorus were measured in accordance with standard methods (APHA et al., 2002) .
All sludge samples were filtered through a 0.45 mm filter before SCOD detection. The ORP of sediment was measured by a HQ30d meter (HACH. USA). The methane and hydrogen sulfide was measured by a GC310 meter (China).
SCFAs and CH 4 were measured by gas chromatography. For the detection of short-chain fatty acids (SCFAs): Phosphoric acid (3%) was dropwise added to regulate the pH of the samples to approximately 4. The SCFAs concentration was characterized by the COD concentration: 1.07 for acetic acid, 1.51 for propionic acid, 1.82 for butyric and isobutyric acid, and 2.04 for valeric and isovaleric acid (Feng et al., 2009) .
All sludge samples were filtered through a 0.45 mm filter before SCOD detection. The ORP of sediment was measured by a HQ30d meter (HACH. USA). The methane and hydrogen sulfide was measured by a GC310 meter (China).
SCFAs and CH 4 were measured by gas chromatography. For the detection of short-chain fatty acids (SCFAs): Phosphoric acid (3%) was dropwise added to regulate the pH of the samples to approximately 4. The SCFAs concentration was characterized by the COD concentration: 1.07 for acetic acid, 1.51 for propionic acid, 1.82 for butyric and isobutyric acid, and 2.04 for valeric and isovaleric acid (Feng et al., 2009) .
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