Respirometric Assessment of Primary Sludge Fermentation Products

Çokgör, Emine Ubay; Zengin, Gülsüm Emel; Taş, Didem Okutman; Oktay, Seda; Randall, Clifford W.; Orhon, Derin

doi:10.1061/(asce)0733-9372(2006)132:1(68)

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…The quantification of COD concentration of this solution indicated a low level (139 ± 12 mg L −1 ). Such a result is consistent with the analysis of total VFA by gas chromatography, in which only acetic acid was detected among seven VFA determinations, at a concentration of 60 ± 25 mg acetic acid L −1 equivalent to 64 mg COD L −1 (using a conversion factor of 1.07 [32]). Xie et al [8] indicated that volatile organic compounds, such as VFA that exert partial vapor pressures comparable to or higher than water, are transported across hydrophobic membranes with the water vapor.…”

Section: Characterization Of the Acidic Solution Containing The Concesupporting

confidence: 89%

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

et al. 2019

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Gas-permeable membrane technology is a new strategy to minimize ammonia losses from manure, reducing pollution and recovering N in the form of an ammonium salt fertilizer. In this work, a new operational configuration to recover N using the gas-permeable membrane technology from swine manure was tested in a semi-continuous mode. It treated swine manure with a total ammonia nitrogen (TAN) concentration of 3451 mg L−1. The system was operated with low aeration rate (to raise pH), and with hydraulic retention times (HRT) of seven days (Period I) and five days (Period II) that provided total ammonia nitrogen loading rate (ALR) treatments of 491 and 696 mg TAN per L of reactor per day, respectively. Results showed a uniform TAN recovery rate of 27 g per m2 of membrane surface per day regardless of the ALR applied and the manure TAN concentration in the reactor. TAN removal reached 79% for Period I and 56% for Period II, with 90% of recovery by the membrane in both periods. Water capture in the acidic solution was also uniform during the experimental period. An increase in temperature of 3 °C of the acidic solution relative to the wastewater reduced 34% the osmotic distillation and water dilution of the product. These results suggested that the gas-permeable membrane technology operating in a semi-continuous mode has a great potential for TAN recovery from manure.

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Section: Characterization Of the Acidic Solution Containing The Concesupporting

confidence: 89%

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

et al. 2019

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“…It is noteworthy to mention that a similar VFA speciation pattern has been obtained in a number of other studies using primary or secondary municipal sludge as substrate. [23,33,34] The profiles of filtered TOC concentration obtained followed closely, in most cases, those of the corresponding net VFAs shown in Figure 2. Overall, the percent TOC in the form of VFAs (VFA-carbon or VFA-C) increased from a mean value of 16 ± 2 % at the start of each test to over 90 % by day 2 and remained at such high levels afterwards, indicating that VFAs were the principal contributor of the soluble organic carbon content during digestion regardless of the variation in the F/S ratio.…”

Section: Solids Destructionsupporting

confidence: 52%

The effect of upper mesophilic temperature and feed-to-seed ratio on batch anaerobic digestion systems

Rahman

Elefsiniotis

2010

Journal of Environmental Science and Health, Part A

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This study investigated the effect of upper mesophilic temperature and feed-to-seed (F/S) ratio on anaerobic digestion using four 3.5 L batch-scale reactors. Initially, eight F/S ratios, ranging from 10/90 to 90/10, were explored at 37 degrees C, using a mixture of primary and secondary municipal sludge as feed. It was observed that the systems with low F/S ratios (40/60 and below) showed a stable performance while those with high ratios (50/50 and above) experienced the effect of organic overloading indicated by reduced removal of volatile solids (VS) in the feed, a drop in pH, volatile fatty acid (VFA) accumulation during the first 10 days of operation, and total gas production markedly lower than the corresponding theoretical values. Subsequently, the effect of temperature, in the 37 to 49 degrees C range, was studied at an F/S ratio of 20/80. Results revealed that an increase in temperature between 37 and 43 degrees C had a rather minimal effect on the process, with the exception of a moderate increase in total gas production. A further rise in the temperature in the 45 to 49 degrees C range however appeared to trigger an adverse effect evidenced by enhanced percent VSS reduction (possibly the result of cell lysis), VFA accumulation and an increase in the non-VFA total organic carbon (TOC) content. Therefore, it can be concluded that an operating temperature in the 37 to 43 degrees C range resulted in a stable and satisfactory reactor performance.

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“…It contains small amounts of nonhydrolyzable particulate materials and biomass by bacteria due to biological metabolism. In contrast, PS consists of a high portion of organic matter such as feces, vegetables, fruits, textiles and paper, a significant organic carbon fraction for the subsequent nutrient removal processes [14][15][16]. Meanwhile, PS has different biodegradation characteristics in comparison with WAS.…”

Section: Introductionmentioning

confidence: 88%

The effect of pH on anaerobic fermentation of primary sludge at room temperature

Yang

Zhou

et al. 2009

Journal of Hazardous Materials

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Respirometric Assessment of Primary Sludge Fermentation Products

Cited by 17 publications

References 16 publications

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

Application of Gas-Permeable Membranes For-Semi-Continuous Ammonia Recovery from Swine Manure

The effect of upper mesophilic temperature and feed-to-seed ratio on batch anaerobic digestion systems

The effect of pH on anaerobic fermentation of primary sludge at room temperature

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