Anaerobic digestion of synthetic food waste-cardboard mixtures in a semi-continuous two-stage system

2019 ◽  
Vol 3 (12) ◽  
pp. 3582-3593 ◽  
Author(s):  
Caitlin M. Asato ◽  
Jorge Gonzalez-Estrella ◽  
Donald S. Skillings ◽  
Andrea Vargas Castaño ◽  
James J. Stone ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Two Stage ◽  
In Series ◽  
Corrugated Cardboard ◽  
Stage System ◽  
Continuously Stirred Tank Reactor ◽  
Anaerobic Sludge Blanket

A two-stage anaerobic digestion system consisting of a continuously-stirred tank reactor and upflow anaerobic sludge blanket (CSTR-UASB) in series was evaluated for semi-continuous digestion of food waste and corrugated cardboard mixtures.

scholarly journals Solid state anaerobic digestion of mixed organic waste: the synergistic effect of food waste addition on the destruction of paper and cardboard

2019 ◽  
Author(s):  
Nigel G. H. Guilford ◽  
HyunWoo Peter Lee ◽  
Kärt Kanger ◽  
Torsten Meyer ◽  
Elizabeth A. Edwards
Keyword(s):  
Anaerobic Digestion ◽  
Solid State ◽  
Synergistic Effect ◽  
Food Waste ◽  
The United States ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Destruction Efficiency ◽  
Solids Retention ◽  
Anaerobic Sludge Blanket

ABSTRACTFull-scale anaerobic digestion processes for organic solid waste are common in Europe, but generally unaffordable in Canada and the United States because of inadequate regulations to restrict cheaper forms of disposal, particularly landfill. We investigated the viability of solid-state anaerobic digestion (SS-AD) as an alternative that reduces the costs of waste pretreatment and subsequent wastewater treatment. A laboratory SS-AD digester, comprising six 10L leach beds and an upflow anaerobic sludge blanket reactor treating the leachate, was operated continuously for 88 weeks, with a mass balance of 101±2%. The feed was a mixture of cardboard, boxboard, newsprint, and fine paper, and varying amounts of food waste (from 0% to 29% on a COD basis). No process upset or instability was observed. The addition of food waste showed a synergistic effect, raising CH4 production from the fibre mixture from 52.7 L.kg-1COD fibreadded to 152 L.kg-1COD fibreadded, an increase of 190%. Substrate COD destruction efficiency reached 65% and a methane yield of 225 L.kg-1 CODadded was achieved at 29% food waste on a COD basis, and a solids retention time of 42 days. This performance was similar to that of a completely stirred tank reactor digesting similar wastes, but with much lower energy input.Abstract Figure

scholarly journals COD, TSS, nutrients and coliforms removals in UASB reactors in two stages treating swine wastewater

2014 ◽  
Vol 34 (6) ◽  
pp. 1256-1269 ◽  
Author(s):  
Roseane Del'Arco Ramires ◽  
Roberto Alves de Oliveira
Keyword(s):  
Pilot Scale ◽  
Upflow Anaerobic Sludge Blanket ◽  
Swine Wastewater ◽  
Anaerobic Sludge ◽  
Two Stage ◽  
In Series ◽  
Removal Efficiencies ◽  
Two Stages ◽  
Anaerobic Sludge Blanket ◽  
Uasb Reactors

The performance of two upflow anaerobic sludge blanket (UASB) reactors was evaluated in pilot scale (908 and 188 L), installed in series (R1 and R2), fed with swine wastewater with TSS around 5 and 13 g L-1. The UASB reactors were submitted to HDT of 36 and 18 h with VOL of 5.5 to 34.4 g COD (L d)-1 in the R1 and HDT of 7.5 e 3.7 h with VOL from 5.1 to 45.2 g COD (L d)-1 in the R2. The average removal efficiencies of COD ranged from 55 to 85% in the R1 and from 43 to 57% in the R2, resulting in values from 82 to 93% in the UASB reactors in two stage. Methane concentrations in the biogas were 69 to 74% with specific production from 0.05 to 0.27 L CH4 (g removedCOD)-1 in the R1 and of 0.10 to 0.12 L CH4 (g removedCOD)-1 in the R2. The average removal efficiencies were 61 to 75% for totalP, 39 to 69% for KN, 82 to 93% for orgN and 20 to 94% for Fe, Zn, Cu and Mn. The amN concentration were not reduced indicating the need to post-treatment for effluent disposal into water bodies. There were reductions of total coliforms from 99.8123 to 99.9989% and of thermotolerant coliforms from 99.9725 to 99.9999%. The conditions imposed to the UASB reactors in two stage provided high conversions of removedCOD into methane (up to 77%) and reductions of organic an inorganic pollution loads from swine wastewater.

The periodic anaerobic baffled reactor

1998 ◽  
Vol 38 (8-9) ◽  
pp. 401-408 ◽  
Author(s):  
I. V. Skiadas ◽  
G. Lyberatos
Keyword(s):  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Switching Frequency ◽  
Reactor Performance ◽  
Active Biomass ◽  
Anaerobic Baffled Reactor ◽  
Stable Periodic ◽  
Reactor Type ◽  
Continuously Stirred Tank Reactor ◽  
Anaerobic Sludge Blanket

The most common bioreactor type used for anaerobic digestion is the Continuously Stirred Tank Reactor (CSTR). The main problem of this reactor type, i.e. the fact that the active biomass is continuously removed from the system leading to long retention times, has been overcome in a number of systems based on immobilization of the active biomass. Two represenstative types are the Upflow Anaerobic Sludge Blanket Reactor (UASBR) and the Anaerobic Baffled Reactor (ABR). The success of these reactor systems rests on the highly flocculated, well settling, compact methanogenic sludge granules which develop in these reactors. A novel reactor type named Periodic Anaerobic Baffled Reactor (PABR) has been designed, offering the following major advantage: it may be operated as an ABR, a UASBR or at an intermediate mode. The PABR hydraulic behavior has been characterized using residence time distribution experiments at different retention times. Simulating the PABR behavior, the dependence of the reactor performance on the switching frequency is determined as a function of the retention time. In particular, it is found that for high retention times the ABR mode is superior, whereas for low retention times, the UASBR mode should be preferred. In order to establish the accuracy of the predictions of the simulation study, the PABR behavior was experimentally verified using three different stable periodic states.

Importance of the ammonia volatilization rates in shallow maturation ponds treating UASB reactor effluent

2012 ◽  
Vol 66 (6) ◽  
pp. 1239-1246 ◽  
Author(s):  
Fernando Augusto Lopes de Assunção ◽  
Marcos von Sperling
Keyword(s):  
Nitrogen Removal ◽  
Ammonia Volatilization ◽  
Ammonia Nitrogen ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Unit Surface Area ◽  
In Series ◽  
Belo Horizonte ◽  
Anaerobic Sludge Blanket

This study aimed at determining the influence of ammonia volatilization on nitrogen removal in polishing (maturation) ponds treating sanitary effluent from upflow anaerobic sludge blanket (UASB) reactors in the city of Belo Horizonte, Brazil. An apparatus for the capture and absorption of volatilized ammonia in three polishing ponds in series was installed. Volatilized ammonia was captured by a chamber on the surface of the ponds and dissolved in boric acid solution, in order to estimate the amount of ammonia per unit surface area of each pond. Low rates of volatilization, below 0.2 kg/ha.d, in about 75% of samples from all the ponds, were observed. The mass balance of ammonia nitrogen of the ponds showed that the volatilization represented only about 2% of the total removal of nitrogen from the polishing ponds. The results obtained suggest that ammonia volatilization was a mechanism of little importance in nitrogen removal in the investigated polishing ponds.

Anaerobic treatment of concentrated latex processing wastewater in two-stage upflow anaerobic sludge blanketA paper submitted to the Journal of Environmental Engineering and Science.

2010 ◽  
Vol 37 (5) ◽  
pp. 805-813 ◽  
Author(s):  
Siriuma Jawjit ◽  
Winai Liengcharernsit
Keyword(s):  
Industrial Effluent ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Optimal Conditions ◽  
Two Stage ◽  
Oxidation Pond ◽  
Treatment Performance ◽  
Anaerobic Sludge Blanket

This study aims to investigate treatment performance of the two-stage upflow anaerobic sludge blanket (UASB) applied to concentrated latex processing wastewater in Thailand. First, optimal conditions including the hydraulic retention time (HRT) in the acid tank and the UASB tank, pH, and temperature (mesophilic and thermophilic) were determined. It was found that the HRT at 24 h and 48 h were the optimal HRT for the acid tank and the UASB tank, respectively. The pH of the system should be controlled at 7 to prevent rubber coagulation and to achieve high treatment performance, and the mesophilic condition (35°C) was found to be the optimal temperature. Second, the two-stage UASB was applied with the optimal conditions mentioned earlier with real wastewater at a latex mill. It was found that methane production was about 0.116 L CH4/g COD removed (16.3–22.8 m3CH4/d), and average chemical oxygen demand (COD) and suspended solids (SS) removal efficiency were about 82% and 92%, respectively. In case of SS removal, the results revealed that the two-stage UASB was capable of overcoming the limitations of the single-stage UASB in treating concentrated latex effluent. The results indicated that application of the two-stage UASB to concentrated latex processing wastewater is feasible. Nevertheless, combination with other treatment systems (e.g., oxidation pond, aerated lagoon) is necessary to meet Thailand's industrial effluent standards (in the case of COD).

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