The effects of pH, temperature and agitation speed on sludge anaerobic hydrolysis‐acidification

Pérot, C.; Sergent, Michelle; Richard, Pierre; Luu, R. Phan Tan; Millot, N.

doi:10.1080/09593338809384628

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…In all cases, the mean of replicates for a given treatment will form the basis for discussion. Some anaerobic digester literature that discusses selected aspects of the chemistry of refuse degradation includes Bjorndal and Moore (1988);Magruder et al (1988);and Perot et al (1988). However, there is little guidance in the literature regarding the anaerobic degradation of refuse/soil systems, with an emphasis on the dynamics of carbon and nitrogen.…”

Section: Resultsmentioning

confidence: 99%

Effect of leachate recirculation on landfill gas production and leachate quality: A controlled laboratory study

Bogner¹,

Spokas²

1995

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NOTICEThis report was prepared as a n account of work sponsored by an agency of the United States government.Neither the United States government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the 2.3. 4. 5.6. 7. 8.Comparison 4. 5.6. 7. 8.Detected constituents in landfill leachate at six sites @om With respect to questions 1, 3, and 4, considered together, the results indicated that there were no quantifiable benefits to leachate recirculation over leachate drainage with respect to methane production, carbon conversion, or leachate quality. Overall, through the decomposition process, the fraction of total carbon converted to biogas carbon ranged from about 0.10 (higher moisture content assays) to 0.50 (lower moisture content assays). The differences in carbon conversion were attributed to high rates of carboxylic acid production (exceeding consumption) in the higher moisture content assays. Cel1ulose:lignin ratios, a measure of decomposition, decreased from 4.3 (initial refuse without soil) to minimum values below 0.05 at the end of the experiment.Leachate quality was evaluated in two ways: changes in chemical concentrations through the leachatehecycle events and overall changes in constituent loading. Loading is calculated from the product of chemical concentration and moisture content to yield the total soluble mass present in a given assay. Calculation of loads addresses simple dilution effects from increased gravimetric moisture contents through the decomposition process. Linear relationships between chloride loads and other constituent loads suggested the contribution of dilution effects to observed leachate concentrations. For the recycle assays, since these were sampled only at the time of destruction, no net changes in liquid volume or leachate chemistry were introduced due I to periodic sampling. Thus, changes in gravimetric moisture content through decomposition could be carefully observed. For recycle assays where the initial moisture: dry solids ratios had initially been 3.2 to 3.2, the final ratios were 5.6 to 9.7; for assays which had higher initial ratios of 7.0 to 7.2, the final ratios were 12.2 to 15.4. With respect to the two soils in this study (question 2 above), they were added at small quantities to simulate the effects of soil cover and must be evaluated in parallel with refuse and leachate chemistry. For example, with respect to nitrogen, as a major nutrient, the total nitrogen content of the clay soil was higher than that of the sand soil, which might be expected to improve gas production rates from a...

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Section: Resultsmentioning

confidence: 99%

Effect of leachate recirculation on landfill gas production and leachate quality: A controlled laboratory study

Bogner¹,

Spokas²

1995

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“…Several analytical tests [TS, VS, VSS, COD, total Kjeldahl nitrogen (TKN), ammonia-nitrogen, orthophosphate, and alkalinity] were conducted in accordance with Standard method^.^' The protein content was calculated from the corresponding TKN concentration by subtracting the inorganic nitrogen concentration (in this case only the N H 3 -N value) and multiplying the difference by 6. 25." Nonstandard testing procedures were used in the following cases: VFA, lactic acid, and pyruvic acid were determined using a computer-controlled gas chromatograph equipped with a flame ionization detector (FID);28 and formic acid was determined by a colorimetric method."…”

Section: Analytical Proceduresmentioning

confidence: 99%

Anaerobic acidogenesis of primary sludge: The role of solids retention time

Elefsiniotis

Oldham

1994

Biotech & Bioengineering

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This research investigates the effect of solids retention time (SRT) on the acid-phase anaerobic digestion of primary sludge. A series of experiments were conducted using two continuous-flow 3-L units with the following configuration: a completely mixed reactor (CMR) with clarifier and solids recycle and an upflow anaerobic sludge blanket (UASB) reactor. Results show that C(2) to C(5) volatile fatty acids (VFA) were the predominant compounds formed. At a constant hydraulic retention time (HRT) of 12 h, variation in SRT from 10 to 20 days resulted in a slight increase in VFA production in both systems, but at a shorter SRT (5 days) a drastic drop in acid production was observed. In addition, the percent distribution of VFA was to some extent affected by the change in SRT. On the other hand, organic matter degradation [measured by the chemical oxygen demand (COD) specific solubilization rate or the percent volatile suspended solids (VSS) reduction] appeared to be independent of SRT, at least in the range investigated. The percent soluble COD in the form of VFA, however, increased steadily with increasing SRT, approaching the 90% level at 20 days. The remaining soluble COD in the effluent from these systems may be mainly attributed to metabolic intermediates and unused soluble substrate.

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“…Agitation strategy can affect anaerobic digestion of sewage sludge and optimum agitation strategy should be found (Perot et al 1988). There is no obvious discussion for the influence of mixing on the gas production.…”

Section: Introductionmentioning

confidence: 99%

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Yılmaz

2017

KSEJ

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Anaerobic digestion (AD) is a multi-stage biological process in which organic material of waste is degraded by microorganisms in the absence of oxygen (Esposito et al. 2012). This process also minimizes the volume of waste generation and resulted digestate could be used in agriculture as nutrient fertilizers or soil conditioner. AD has become an established and proven technology for the treatment of wastes, coming from including those of domestic/municipal, agricultural and industrial origins (De Baere 2000). Biochemical methane potential (BMP) is a procedure, first established by Owen et al. (Owen et al. 1979), developed to determine the realistic estimate of methane production of a given organic substrate during its anaerobic decomposition. The BMP assay has demonstrated to be a relatively simple, reliable and powerful tool to obtain the extent and rate of

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The effects of pH, temperature and agitation speed on sludge anaerobic hydrolysis‐acidification

Cited by 25 publications

References 9 publications

Effect of leachate recirculation on landfill gas production and leachate quality: A controlled laboratory study

Effect of leachate recirculation on landfill gas production and leachate quality: A controlled laboratory study

Anaerobic acidogenesis of primary sludge: The role of solids retention time

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