Feasibility of methanolic waste treatment in UASB reactors

Bhatti, Zafar Iqbal; Furukawa, Koichi; Fujita, Masanori

doi:10.1016/s0043-1354(96)00144-3

Cited by 35 publications

(33 citation statements)

References 27 publications

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“…Where, ∑X = total biomass produced, g-VSS and ∑S = Total substrate removed, g-COD This value of Y obs was almost one-tenth of the typical activated sludge process (Bhatti et al 1996). Thus, it was consistently shown by means of this study that anaerobic digestion produced comparatively less sludge than the aerobic process.…”

Section: Sludge Characteristicssupporting

confidence: 66%

“…The main constituents of the biogas as reported earlier were methane and carbon dioxide that were produced during anaerobic digestion (Bhatti et al 1996;Mahadevaswamy et al 2004). A small proportion of the biogas was H 2 , if the reactor was not functioning properly, due to the existence of hydrogenproducing acetogens that provided adverse operational conditions for the conversion of VFA to acetate rather then to methane.…”

Section: Bio-gas Productionmentioning

confidence: 71%

“…The average temperature recorded during the course of the study period was 28°C-30°C. Likewise, neutral pH is considered to be the most appropriate range for anaerobic digestion (Bhatti et al 1996). Consequently it was kept constantly at a neutral range, to attain maximum benefit from the process, by adding an external buffer solution of 0.03 M NaHCO 3 , at the rate of 60 ml per litre, to the feed solution of the reactor .…”

Section: Start-up Of the Reactormentioning

confidence: 99%

“…Therefore, biological treatment techniques are considered as viable options for waste management, especially for developing nations (Bhatti et al 1996;Savant et al 2005;Arshad et al 2008). The biological treatment methods are primarily of two kinds, aerobic process and anaerobic process.…”

mentioning

confidence: 99%

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Assessment of the Treatment of Textile Mill Effluent Using UASB Reactor

Arshad

Hashim

Kashif

et al. 2011

AJSTD

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ASEAN J. Sci. Technol. Dev., 28(2): 139 -150 Pakistan is facing acute water deficiency, its water resources have been declining day by day on account of diversified environmental and erroneous water management issues. The available water is being contaminated at a deplorable rate owing to the dumping of untreated domestic and industrial effluent together with agricultural/surface runoff into the receiving waterways. Clean drinking water is therefore only accessible to 18% of its population and the rest of the population are getting polluted drinking water, as designated by the required WHO standards (PCRWR 2005). Moreover, it is an admitted truth that Pakistan has a deficient energy sector despite the fact that it has ample potential for its production. The energy supply deficiency also applies to the electricity sector. Bio-gas is however playing a key role in this sector, which is approximately equal to 37% of the total energy production. Since, it's the most cost-effective and environmentally friendly source of energy, it requires more awareness and consideration for it to undertake the resolution of the energy crises Assessment of the Treatment of Textile Mill EffluentUsing UASB Reactor This study was designed to evaluate the feasibility of the treatment of actual textile mill effluent using a upflow anaerobic sludge blanket (UASB) reactor. The main objective of this study was to generate design aids; in terms of organic loading rate (OLR), hydraulic retention time (HRT) versus chemical oxygen demand (COD) and colour removal in the textile effluent using a UASB reactor at neutral pH and constant mesophilic temperature. The COD, colour and total suspended solids concentration of the textile wastes used in the study were analyzed as 5440 mg/l, 3280 mg/l, 2320 units and 955 mg/l, respectively. The UASB reactor was started up by gradually increasing the OLR from 0.2 kg-COD/m 3 -day to 2.6 kg-COD/m 3 -day in order to prevent an organic shock to the reactor. Similarly, the hydraulic retention time (HRT) was slowly reduced from 58 h to 8 h to prevent the wash-out of sludge from the reactor. It was observed that more than 80% of COD and colour could be effectively removed at an OLR of 2.2 kg-m 3 /d and HRT of 20 h. At optimum operating conditions, the effluent volatile fatty acid concentration was observed to be 430 mg/l. The average biogas production observed during this study was 0.34 l/g-COD removed and it was composed of 58% methane. During the course of maturity of granular sludge, its effective size and settling velocity were observed to increase exponentially as 0.261e 0.051x and 1.91e 0.017x respectively. The overall observed biomass yield (Y obs ) for the experimental period was calculated as 0.049 g-VSS/g-COD rem . This study suggests that the use of a UASB reactor for textile mill effluent is a fairly feasible and viable option.

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Section: Sludge Characteristicssupporting

confidence: 66%

Section: Bio-gas Productionmentioning

confidence: 71%

Section: Start-up Of the Reactormentioning

confidence: 99%

mentioning

confidence: 99%

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Assessment of the Treatment of Textile Mill Effluent Using UASB Reactor

Arshad

Hashim

Kashif

et al. 2011

AJSTD

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“…The results of this study suggest that a UASB reactor is an effective tool and viable option for reducing pollution from dairy mill effluent. (Bhatti et al 1996, Savant et al 2005. The use of anaerobic technology is widely known for its simple design, compact structure, and low operational and maintenance costs.…”

Section: Disclaimermentioning

confidence: 99%

Performance Evaluation of a UASB Reactor Using Dairy Wastes

Ali

Khan

2012

AJSTD

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The ASEAN Committee on Science and Technology was established to strengthen and enhance the capability of ASEAN in science and technology so that it can promote economic development and help achieve a high quality of life for its people. Its terms and reference are:• to generate and promote development of scientific and technological expertise and manpower in the ASEAN region.• to facilite and accelerate the transfer of scientific and technological development among ASEAN countries and from more advanced regions of the world to the ASEAN region.

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Biohydrogen production from pretreated sludge and synthetic and real biodiesel wastewater by dark fermentation

García

Cammarota

2019

Int J Energy Res

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Summary Different types of sludge pretreatments were tested, with thermal shock at 90°C to 95°C for 60 minutes plus a 6‐hour rest period achieving the best results for inhibition of methanogen microorganisms and inoculum enrichment with H2‐producing bacteria, which produced a H2‐rich biogas (up to 65% mol/mol) without the presence of CH4. Wastewater from biodiesel production (WBP), containing mainly methanol (128 g/L) and glycerol (4 g/L), was evaluated as a potential substrate to produce H2 through dark fermentation. Both methanol‐based solutions and methanol‐rich wastewater were not suitable for hydrogen production; however, these effluents showed a strong potential for CH4‐rich biogas production. A fractional factorial design was employed to evaluate the effect of six substrate‐related variables (glycerol content, 25% and 75%; COD content, 4 and 50 g/L, COD:VSS ratio, 1:1 and 5:1; COD:N:P ratio, 350:0:0 and 350:5:1; NaCl content, 0.5 and 12.0 g/L; and pH, 4.0 and 5.5) on the H2 production from glycerol‐methanol–based synthetic solutions (synthetic WBP). Some substrate‐related variables had a crucial impact on the hydrogen production potential from WBP, which was significantly affected by the COD and salinity content in the substrate. WBP containing high glycerol (representing until 75% of the COD) and salinity (up to 12 g/L as NaCl) content could be turned into a potential substrate for H2 production through dark fermentation as long as specific fermentation conditions are maintained, such as pH 5.5 to 5.7 and a substrate COD content up to 50 g/L. Using this condition, glycerol conversion, H2 productivity, and H2 yield of 81.3 ± 8.9%, 102.8 ± 18.2 mL H2/L.d, and 24.5 ± 4.4 mL H2/g CODapplied, respectively, were obtained.

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Feasibility of methanolic waste treatment in UASB reactors

Cited by 35 publications

References 27 publications

Assessment of the Treatment of Textile Mill Effluent Using UASB Reactor

Assessment of the Treatment of Textile Mill Effluent Using UASB Reactor

Performance Evaluation of a UASB Reactor Using Dairy Wastes

Biohydrogen production from pretreated sludge and synthetic and real biodiesel wastewater by dark fermentation

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