Treatment of high strength acidic wastewater with a completely mixed anaerobic filter

Chian, Edward S. K.; DeWalle, Foppe B.

doi:10.1016/0043-1354(77)90062-8

Cited by 56 publications

(11 citation statements)

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“…High recycle rates will establish a flow regime approaching completely mixed and phase separation will be impeded ( Figure 3). Reactors with flow regimes intermediate between plug flow and completely mixed will have partial phase separation in accordance with the flow regime and substrate (Chian and DeWalle, 1977). Gas production and release might also make a plug-flow reactor more completely mixed.…”

Section: Assessment Strategy For Process Applicationmentioning

confidence: 99%

Anaerobic treatment applications and fundamentals: substrate specificity during phase separation

Fox¹,

Pohland²

1994

Water Environment Research

121

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The effect of phase separation on anaerobic biodegradation was evaluated in terms of thermodynamic principles. Individual components of common wastewaters were considered, and results indicate that the response of different substrates to phase-separated anaerobic treatment is diverse. A key element is the response of soluble substrates to acidification when syntrophic relationships are eliminated and biological reactions that require syntrophic relationships are altered. The acidification of carbohydrates and some proteins is thermodynamically favorable. In contrast, the acidification of fatty acids and aromatics is not thermodynamically favorable unless a sink for reducing equivalents is available. Reported data are consistent with this analysis and phase separation has been observed to enhance the treatment of carbohydrate wastewaters. In addition, the potential for detoxification of specific inhibitory compounds under acidifying conditions has been observed. Whether or not treatment of certain substrates will be enhanced by phase separation should be considered in the choice of reactor design, recognizing that various reactor designs exhibit different degrees of phase separation. This paper presents an overview on how phase-separated treatment affects the biodegradation of specific substrates and relates this to the selection of reactor designs. Water Environ. Res., 66, 716 (1994).

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Section: Assessment Strategy For Process Applicationmentioning

confidence: 99%

Anaerobic treatment applications and fundamentals: substrate specificity during phase separation

Fox¹,

Pohland²

1994

Water Environment Research

121

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“…[5] Physicochemical processes often provide better treatment efficiency compared with biological processes in treating older landfill leachates, although they generally have a higher operating cost and consequently increase the cost of dumping waste. [7,8] However, a wide variety of organic compounds and high levels of ammonia nitrogen make the efficiency of the biological process unpredictable. [7,8] However, a wide variety of organic compounds and high levels of ammonia nitrogen make the efficiency of the biological process unpredictable.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Landfill Leachate by White Rot Fungus in Combination with Zeolite Filters

Kim

Park

Kim

2003

Journal of Environmental Science and Health, Part A

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This article presents the experimental work for the treatment of landfill leachate in a combined process using the white rot fungus Phanerochaete chrysosporium and the natural zeolite Clinoptilolite. Clinoptilolite was used in a pretreatment step as a sink for ammonia nitrogen and, on average it reduced the levels of ammonia nitrogen, soluble chemical oxygen demand (COD) and color by 72, 4.7, and 25%, respectively. The reductions by fungal treatment alone were 16.6, 21.5, and 31.2%, respectively. However, a reduction in nitrogen loading greatly enhanced fungal treatment efficiency. A high C/N ratio in the leachate was found preferable for the fungal treatment. With the synergy created by pretreatment and fungal growth that was stimulated by the addition of a growth medium, the process could remove ammonia nitrogen, soluble COD (SCOD) and color at levels as high as 81.5, 65, and 59%, respectively. The ratio of SBOD5/SCOD increased from 0.1 to 0.17 upon treatment, indicating that the process rendered the leachate more amenable to the biological process. This result suggested that the preliminary reduction of ammonia nitrogen was essential in making the fungal process practicable for landfill leachate treatment.

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“…Chian and DeWalle (1977), Frostell (1981), Bowker (1983), Guerrero et al (1997), Leal et al (1998), Wilson et al (1998), Ince et al (2000), Alves et al (2001), Garrido et al (2001) are some notable examples. (Bowker, 1983;Frankin, 2001) Lab scale studies using UASBs to treat low strength wastewater began as early as 1976, with Lettinga et al (1983) performing many of the early studies.…”

Section: Anaerobic Filtersmentioning

confidence: 98%

Anaerobic Treatment of Low Strength Wastewater

Cakir¹,

Stenstrom²

2007

proc water environ fed

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Anaerobic filters (AFs) and upflow anaerobic sludge blanket (UASB) reactors are finding widescale acceptance for treating various types of wastewater. They are frequently used for medium to high strength wastewater (2,000 to 20,000 mg/L COD), but have fewer applications to low strength wastewater (< 1,000 mg/L COD). In order to understand the applicability of anaerobic treatment for low strength wastewater, such as domestic sewage, a literature review was performed and a dynamic mathematical model was developed. The review showed two main variations of anaerobic wastewater treatment techniques (AF and UASB) and a number of modifications of these two themes. Treatment must be performed at ambient temperatures, since there is too little energy production to heat the wastewater. A total of 143 references were found that documented anaerobic wastewater treatment, ranging in strength from 58 mg/L to 62,000 mg/L COD in 34 different countries. A Monod-type kinetic model, which predicts treatment efficiency and gas production, was developed to describe some of the literature observations. The results of the extensive literature review and model predictions suggest that anaerobic treatment is promising and economical for treating low strength wastewater, although production of a useful biogas fuel by-product is doubtful. This is contrary to experience in the United States where anaerobic wastewater treatment is seldom performed.

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Treatment of high strength acidic wastewater with a completely mixed anaerobic filter

Cited by 56 publications

References 1 publication

Anaerobic treatment applications and fundamentals: substrate specificity during phase separation

Anaerobic treatment applications and fundamentals: substrate specificity during phase separation

Treatment of Landfill Leachate by White Rot Fungus in Combination with Zeolite Filters

Anaerobic Treatment of Low Strength Wastewater

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