Behavior of nitrogen and phosphorus during batch aerobic digestion of waste activated sludge—continuous aeration and intermittent aeration by control of DO

Matsuda, Akira; Ide, Tetsuo; Fujii, Shozo

doi:10.1016/0043-1354(88)90161-3

Cited by 21 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The loading of nitrogen in the liquid (dissolved) phase increased from 4 kg/day entering the digesters to 20 kg/ day exiting the digesters. This is generally consistent with previous observations of nitrogen release during aerobic digestion (e.g., Anderson & Mavinic, 1993;Bishop & Farmer, 1978;Kim et al, 2002;Matsuda et al, 1988).…”

Section: Research Articlesupporting

confidence: 93%

“…Are the concentrations and fluxes of inorganic nitrogen in the sidestream high enough to interfere with EBPR in the mainstream treatment process? Bishop and Farmer (1978), Matsuda, Ide, and Fujii (1988), Tonkovic (1999), Anderson and Mavinic (1993), Kim et al (2002), and Ju et al (2005) have partially addressed these questions in bench-or pilot-scale systems, but to the best of our knowledge, there has not yet been an investigation of nutrient mass fluxes at a full-scale facility employing aerobic digestion. Therefore, toward answering the questions posed above, the overall objective of this paper is to quantitatively assess the fate of nitrogen and phosphorus at treatment facilities that employ biological nutrient removal (BNR), aerobic digestion, and sidestream recycle.…”

Section: Research Articlementioning

confidence: 99%

“…Are the concentrations and fluxes of inorganic nitrogen in the sidestream high enough to interfere with EBPR in the mainstream treatment process? Bishop and Farmer (), Matsuda, Ide, and Fujii (), Tonkovic (), Anderson and Mavinic (), Kim et al (), and Ju et al () have partially addressed these questions in bench‐ or pilot‐scale systems, but to the best of our knowledge, there has not yet been an investigation of nutrient mass fluxes at a full‐scale facility employing aerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mass fluxes of nitrogen and phosphorus through water reclamation facilities: Case study of biological nutrient removal, aerobic sludge digestion, and sidestream recycle

Kassouf

Parra

Mulford

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

At water reclamation facilities, recycling of nutrients (nitrogen and phosphorus) from solids‐handling processes to the mainstream treatment process can have detrimental effects on biological nutrient removal systems. In this study, mass fluxes of nitrogen and phosphorus were quantified through the treatment trains at the Northwest Regional Water Reclamation Facility (NWRWRF) and the adjoining Biosolids Management Facility (BMF), which receives sludge from several water reclamation facilities in Hillsborough County, Florida. The driving objectives were to determine (a) whether the return stream from BMF to NWRWRF (i.e., the “sidestream”) represents a significant source of nitrogen and phosphorus to NWRWRF, and (b) whether the sidestream return from BMF is interfering with biological nutrient removal processes at NWRWRF. We determined that nearly half of the overall phosphorus flux into NWRWRF is recycled from the BMF sidestream. This leads to an increased cost of treatment, for example, for alum used in phosphorus removal at NWRWRF. In contrast to phosphorus, the flux of nitrogen from BMF to NWRWRF is small (~3%) compared with the flux of nitrogen entering NWRWRF in raw wastewater. However, nitrogen in the sidestream is mostly in the form of nitrate, which prevents anaerobic conditions from developing in the fermentation basin at NWRWRF, and thereby interferes with the enhanced biological phosphorus removal (EBPR) process. Some measurements suggest that fermentation and release of phosphorus may occur in the return activated sludge line (despite the relatively short residence time in that line), which supports EBPR and may partially compensate for anoxic (denitrifying) conditions in the fermentation basin. Therefore, overall, NWRWRF is able to meet its permit limits for phosphorus through a combination of EBPR and alum addition. Although the fluxes measured here are particular to the treatment systems under consideration, the general trends observed are likely to apply to many similar facilities that employ biological nutrient removal, aerobic digestion, and sidestream recycle, particularly those with regional biosolids management facilities. We recommend that such facilities consider (a) removal or recovery of phosphorus from their sidestreams and (b) returning sidestreams downstream of fermentation basins to avoid inhibition of EBPR processes. Practitioner points Sidestreams from aerobic digestion can represent significant sources of phosphorus to mainstream wastewater treatment. Recycle of nitrate in aerobic digestion sidestreams can interfere with enhanced biological phosphorus removal (EBPR) during mainstream treatment. Fermentation of return activated sludge (RAS) can support EBPR, even under short average hydraulic residence times (minutes).

show abstract

Section: Research Articlesupporting

confidence: 93%

Section: Research Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mass fluxes of nitrogen and phosphorus through water reclamation facilities: Case study of biological nutrient removal, aerobic sludge digestion, and sidestream recycle

Kassouf

Parra

Mulford

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…In Equation 3, C 5 H 7 NO 2 was assumed to be the component formula of an activated sludge cell by Matsuda et al (1988). In our experiment the pattern of alkalinisation during composting was not the same for both composting runs (Figure 3).…”

Section: Effect Of Acidification On the Composting Processmentioning

confidence: 73%

Untitled

Boucher¹,

Revel²,

Guiresse³

et al. 1999

Water, Air, and Soil Pollution

View full text Add to dashboard Cite

The release of ammonia nitrogen during composting of sewage sludge mixed with a lignocellulosic bulking agent leads to a reduction in the agronomic value of the final compost and to harmful effects on the environment. We propose adding a cheap salt FeCl 3 which can be used without special precaution to reduce ammonia losses by decreasing pH conditions. An in-vessel cocomposting experiment was conducted in a large reactor (100 L) in which FeCl 3 was added to sludge mixed with a bulking agent (pine shavings and sawdust) and compared with a control mixture without FeCl 3. Temperature, oxygen consumption and pH were monitored throughout the composting of both mixtures. The final balance of organic matter, organic and inorganic nitrogen permitted to conclude that the addition of FeCl 3 reduced nitrogen loss (by a factor of 2.4 in relation to the control) and increased mineralisation of the organic nitrogen by 1.6.

show abstract

“…However, more often the alkalinity in the feed is insufficient to neutralize the acidity released, resulting in a reduced pH that inhibits digestion. If, on the other hand, an anoxic cycle is incorporated to the digester, it is possible to reduce the nitric acid present (Hao and Kim, 1990;Hao et al, 1991;Matzuda et al, 1988;and Peddie et al, 1990). If the nitric acid produced during the aerobic cycle is fully denitrified during the anoxic cycle, the resulting overall reaction is:…”

Section: Introductionmentioning

confidence: 98%

Improving Aerobic Digestion by Prethickening, Staged Operation, and Aerobic–Anoxic Operation: Four Full‐Scale Demonstrations

Bailey¹

2000

Water Environment Research

View full text Add to dashboard Cite

Four full-scale aerobic digesters were studied to determine the effects of prethickening, staged operation, and aerobic-anoxic operation on digester performance. Prethickening is expected to enhance aerobic digestion by reducing hydraulic flow rates, thereby allowing increased solids retention time (SRT) values and temperature elevation. Staged operation increases the plug flow characteristic of the digester, resulting in increased solids stabilization and pathogen destruction. Aerobic-anoxic operation results in denitrification, which can provide approximately neutral pH that enhances nitrification, digestion, and nitrogen removal. Results demonstrate that staging enhances digestion and reduces the SRT necessary to produce stabilized solids (i.e., one with a volatile solids reduction efficiency greater than 38% or a specific oxygen uptake rate less than 1.5 mg O 2 /g volatile suspended solids⅐h). Effective pathogen destruction is also observed. Aerobic-anoxic operation at several facilities resulted in maintenance of approximately neutral pH values, enhanced digestion, near-complete nitrification, and nitrogen removal. Prethickening resulted in autoheating at the Paris, Illinois, site, caused by the high concentration of biodegradable volatile solids in the digester feed, and at the Los Lunas, New Mexico, facility, which was specifically designed to maintain specified temperatures. The oxygen transfer capacity of the first stage must be adequate to meet the increased process oxygen requirement in that stage to allow increased digestion rates. A combination of low temperature and high solids concentration may interfere with oxygen transfer capacity. Excessive foaming can occur if adequate oxygen transfer capacity is not provided. Excellent performance can be achieved at SRT values in the 20-to 40-day range at operating temperatures of 20°C or greater. Water Environ. Res., 72, 260 (2000).

show abstract

Behavior of nitrogen and phosphorus during batch aerobic digestion of waste activated sludge—continuous aeration and intermittent aeration by control of DO

Cited by 21 publications

References 2 publications

Mass fluxes of nitrogen and phosphorus through water reclamation facilities: Case study of biological nutrient removal, aerobic sludge digestion, and sidestream recycle

Mass fluxes of nitrogen and phosphorus through water reclamation facilities: Case study of biological nutrient removal, aerobic sludge digestion, and sidestream recycle

Untitled

Improving Aerobic Digestion by Prethickening, Staged Operation, and Aerobic–Anoxic Operation: Four Full‐Scale Demonstrations

Contact Info

Product

Resources

About