Treatment of Chlorobenzene-Contaminated Gas Stream in a Biotrickling Filter Inoculated with Ralstonnia pickettii L2

2014 ◽  
Vol 700 ◽  
pp. 253-256
Author(s):  
Lan Zhou ◽  
Shi Gang Su ◽  
Li Li Zhang
Keyword(s):  
Degradation Rate ◽  
Biotrickling Filter ◽  
Mass Ratio ◽  
Inlet Concentration ◽  
Waste Gas ◽  
Benzene Toluene ◽  
Metabolic Activities ◽  
Specific Degradation ◽  
Menten Kinetic ◽  
Empty Bed Residence Time

Biotrickling filter (BTF) inoculated with Ralstonniapickettii L2 was established to treat waste gas containing chlorobenzene (CB). Results revealed BTF could achieve more than 80% removal efficiency of CB under the conditions of <0.6 g·m-3inlet concentration and >30 s empty bed residence time (EBRT). The mass ratio of carbon dioxide produced to the mixture of benzene, toluene, and oxylene (BTo-X) removed was approximately 2.10, indicating that 89.5% mineralization of the incoming CB vapor. The degradation of CB in the BTF followed Michaelis-Menten kinetic model, and the maximum specific degradation rate (rmax) was 76.3g·m-3·h-1. AWCD values indicated that the microganisms in the BTF showed the high microbial metabolic activities. Real-time PCR indicated that Ralstoniapickettii L2 could still maintain its stability andactivity in the BTF under different conditions.

Treatment of methanol in a dry biofilm reactor using tubular carrier

2000 ◽  
Vol 42 (5-6) ◽  
pp. 419-427 ◽  
Author(s):  
F. Thalasso ◽  
F. Omil ◽  
J.O. Otero ◽  
J.M. Lema
Keyword(s):  
Gas Flow ◽  
Degradation Rate ◽  
Biofilm Reactor ◽  
Lag Phase ◽  
Biofilm Growth ◽  
Flow Rates ◽  
Waste Gas ◽  
Loading Rates ◽  
Volumetric Loading ◽  
Specific Degradation

A 13.4 l Dry Tubular Biofilm reactor (DTB), with 19 PVC tubes as carrier, was used to treat polluted air using methanol as a model pollutant. The design of this reactor was based on the creation of a mist by contacting the waste gas and a discontinuous liquid nutrient supply into an atomising nozzle. Air was fed into the reactor at specific gas flow rates from 60 to 230 m3/m3 · h, containing from 0.25 to 2.84×10-3 kg/m3 of methanol (volumetric loading rates from 1.4 to 4.7 kg/m3 · d). Biofilm growth was observed from the very beginning of the experiment although preferentially on the reactor's wall and not on the tubular carrier. Methanol degradation was observed to increase along the experiment and reached 1.24 kg/m3 · d. The efficiency of this system was limited by the clogging of the tubes used as carrier. The biofilm developed directly on the wall of the reactor had a specific methanol degradation rate of 1.08 kg/kgVSS · h, while only 0.6 kg/kgVSS · h of methanol were degraded after a long lag phase by the biomass developed inside the tubular carrier. Another experiment was carried out with the empty reactor without PVC tubing. In that case, a specific degradation rate of 4.15 kg/m3 · d was observed, which confirm that PVC tubular carrier was clearly not favourable to the process.

Simplified Simulation Model of a Biotrickling Filter Used for the Removal of Hydrogen Sulfide From Biogas

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Anil K. Dhussa ◽  
Surinder S. Sambi ◽  
Surendra Kumar ◽  
Shashi Kumar ◽  
Jitendra K. Prajapati
Keyword(s):  
Simulation Model ◽  
Packed Bed ◽  
Biotrickling Filter ◽  
Inlet Concentration ◽  
Biofilm Thickness ◽  
Biotrickling Filters ◽  
Bed Height ◽  
Packing Size ◽  
Empty Bed Residence Time ◽  
Good Agreement

Biogas produced by the anaerobic digestion of waste contains approximately 1000-1200 ppmv H2S, which is toxic and corrosive. It is necessary to remove H2S before using the biogas in further application. Biotrickling filters containing immobilized Thiobacillus sp. on inert packings are used extensively in the industries. The design equations for biotrickling filter are complex in nature. A simplified simulation model has been proposed where the complexity of solving the diffusion equation forming a boundary value problem has been avoided by utilizing an approximate general solution available in the literature for this class of problems. The simplified simulation model has been validated with the experimental data, with the analytical solutions available for limiting cases, and with the numerical solution. The results have been found in good agreement for air-H2S system. Further, the performance of an industrial biotrickling filter, designed to treat 10000 m3.day-1 biogas to reduce H2S concentration from 1200 ppmv to 100 ppmv, has been analyzed by studying the effect of packed bed height, inlet concentration of H2S, empty bed residence time of gas, biofilm thickness and packing size on its removal efficiency by using proposed simplified model.

Removal of Ammonia from Waste Gases by a Biotrickling Filter

2011 ◽  
Vol 233-235 ◽  
pp. 759-764 ◽  
Author(s):  
Jian Wei Liu ◽  
Yu Zhu Zhao ◽  
Wen Lin Ma
Keyword(s):  
Loading Rate ◽  
Biotrickling Filter ◽  
Ammonia Oxidizing Bacteria ◽  
Gaseous Emissions ◽  
Inlet Concentration ◽  
Flow Rates ◽  
Loading Rates ◽  
Nitrite Oxidizing Bacteria ◽  
Maximum Elimination Capacity ◽  
Empty Bed Residence Time

A laboratory-scale biotrickling filter was evaluated for its effectiveness in treating waste gases containing ammonia at different inlet loading rates. The inlet concentration of ammonia varied from 20～300mg/m3, and the air flow rates were 0.61m3/h, 0.85m3/h and 1.06m3/h, equivalent to empty bed residence time of 35s, 25s and 20s, respectively. The experimental results showed that the inlet ammonia can be efficiently removed in the biotrickling filter. The removal efficiency was nearly 100% when inlet ammonia loading rate was below 28.33g/m3·h, and the maximum elimination capacity for the biotrickling filter was determined to be about 33.99 g/m3·h. The results in microbial analyses had proven that the ammonia oxidizing bacteria and nitrite oxidizing bacteria were dominant in the biotrickling filter. These results show that the treatment system studied can be considered as a viable alternative for the treatment of gaseous emissions containing different concentrations of ammonia.

scholarly journals Removal of Ethanethiol Gas by Iron Oxide Porous Ceramsite Biotrickling Filter

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Peipei Wang ◽  
Shuchuan Peng ◽  
Chengzhu Zhu ◽  
Xiongjun Zhang ◽  
Fei Teng
Keyword(s):  
Iron Oxide ◽  
Biotrickling Filter ◽  
Operating Parameters ◽  
Inlet Concentration ◽  
Operation Conditions ◽  
Spray Density ◽  
Desulfurization Process ◽  
Removal Efficiencies ◽  
Operation Characteristics ◽  
Empty Bed Residence Time

The performance of ethanethiol removal in biotrickling filter was investigated by microorganisms fixed on iron oxide-based porous ceramsite (IPC) under different operating parameters conditions. Ethanethiol removal efficiency was examined as a function of inlet concentration, empty bed residence time (EBRT), and spray density of nutrient solution. The results showed that the optimized operation conditions and operation characteristics of biotrickling filter for this study were at the inlet concentration of less than 250 mg·m−3, the spray density of 0.24 m3·m−2 h−1, and the EBRT of 68.7 s. The variation of the EBRT of about 100 s and the spray density of about 0.24 m3·m−2 h−1did not change the ethanethiol removal efficiencies at certain ethanethiol concentrations of less than about 300 mg/m3, respectively. The main metabolic product was sulfate such asSO42-under continuous long-running regime in filter. The ethanethiol desulfurization process better meets the Michaelis-Menien model with calculated kinetic degradation parametersKs=7.96 mg·m−3andVm=221.73 g·m−3 h−1.

scholarly journals Investigating the species of microorganisms from activated sludge for handling phenol contaminated-air streams in biotrickling filter

2013 ◽  
Vol 16 (3) ◽  
pp. 96-105
Author(s):  
Anh Thi Kim Nguyen ◽  
Mi Thi Tra Le ◽  
Phu Ly Sy Nguyen ◽  
Nga Diep Yen Dang ◽  
Hien Thi To
Keyword(s):  
Bacillus Thuringiensis ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
High Efficiency ◽  
Bacillus Pumilus ◽  
Air Flow ◽  
Biotrickling Filter ◽  
Inlet Concentration ◽  
Air Streams ◽  
Removal Equipment

This research aimed at investigating the species of microorganisms from activated sludge is capable of handling gas-containing phenol vapor by means of trickling biofilter. By isolating and culturing microorganisms, two species, Bacillus pumilus and Bacillus thuringiensis, was discovered to dominate in phenol vapor removal equipment with high efficiency (about 90% with B. pumilus strain and 92% with B. thuringiensis strains) at inlet concentration about 650 - 850 mg/Nm3 and air flow of 1.5 L/min. Simultaneously, similar experiments were carried out with mixed microorganisms obtained removal efficiency of more than 80%. This result showed that microorganisms after being isolated gave higher performance than mixture of microorganisms. In particular, strain of B. thuringiensis could handle up to 3600 mg/Nm3 in inlet concentration at about 184.3 gphenolm-3.h-1 elimination capacity when removal efficiency was over 92%.

scholarly journals Styrene and Bioaerosol Removal from Waste Air with a Combined Biotrickling Filter and DBD–Plasma System

2020 ◽  
Vol 12 (21) ◽  
pp. 9240
Author(s):  
Steffen Helbich ◽  
Daniel Dobslaw ◽  
Andreas Schulz ◽  
Karl-Heinrich Engesser
Keyword(s):  
Energy Levels ◽  
Biotrickling Filter ◽  
Dbd Plasma ◽  
Combined System ◽  
Waste Gas ◽  
Process Gas ◽  
Volatile Organic ◽  
Waste Air ◽  
Specific Input Energy ◽  
Non Thermal Plasma

A combined system of a biotrickling filter and a non-thermal plasma (NTP) in a downstream airflow was operated for 1220 days for treatment of emissions of styrene and secondary emissions of germs formed in the biological process. The biotrickling filter was operated at variable inlet concentrations, empty bed residence times (EBRT), type and dosage of fertilizers, irrigation densities, and starvation periods, while dielectric barrier discharge and corona discharge were operated at different specific input energy levels to achieve optimal conditions. Under these conditions, efficiencies in the removal of volatile organic compounds (VOCs), germs and styrene of 96–98%, 1–4 log units and 24.7–50.1 g C m−3 h−1 were achieved, respectively. Fluid simulations of the NTP and a germ emission-based clocking of the discharge reveal further energy saving potentials of more than 90%. The aim of an energy-efficient elimination of VOCs through a biotrickling filter and of secondary germ emissions by a NTP stage in a downstream airflow for potential re-use of purified waste gas as process gas for industrial application was successfully accomplished.

Study on the Treatment of Nitrogen Oxides by Compound Bio-Filter

2012 ◽  
Vol 610-613 ◽  
pp. 1824-1828
Author(s):  
Zhi Fei Liu ◽  
De Hong Pang
Keyword(s):  
Removal Efficiency ◽  
Gas Flow ◽  
Load Capacity ◽  
Packing Material ◽  
Operating Conditions ◽  
Inlet Concentration ◽  
Trickling Filter ◽  
Spray Volume ◽  
Packing Layer ◽  
Empty Bed Residence Time

Activated carbon and wood chips were applied respectively as packing material of bio-trickling filter and bio-filter which composed the compound bio-filter and the effect of different operating parameters on NOx removal efficiency were studied. The results show that the best operating conditions of the compound bio-filter are: NO inlet concentration 604.5 mg/m3, spray volume 1.2 L/h, gas flow 0.6 m3/h(empty bed residence time 103.7 s).In such cases,NOx removal efficiency is over 96% and NOx removal load of the packing material is 29.66 g/(m3•h) . The remove of NOx is mainly completed by the packing layer of 0~50 cm height both in the bio-trickling filter and in the bio-filter, that is to say ,when the total packing layer height of the compound bio-filter is 100 cm, the purification effect is ideal and economical; The system can return to normal in about 7 hr when the dynamic load changes largely and suddenly, showing that it has strong anti shock load capacity.

Synergetic Degradation of Zidovudine Wastewater by Ultrasonic and Iron-Carbon Micro-Electrolysis

2011 ◽  
Vol 347-353 ◽  
pp. 1949-1952 ◽  
Author(s):  
Liang Li ◽  
Bing Zhe Xu ◽  
Chang Yu Lin ◽  
Xiao Min Hu
Keyword(s):  
Reaction Time ◽  
Degradation Rate ◽  
Removal Rate ◽  
Cod Removal ◽  
Mass Ratio ◽  
Initial Ph ◽  
Cod Removal Rate

Zidovudine wastewater is difficult to biodegradation due to high COD and toxicity. The synergetic treatment of Zidovudine wastewater by Ultrasonic and iron-carbon micro-electrolysis technology was studied. The influence of initial pH, reaction time, mass ratio of iron and carbon and mass ratio of iron and water on degradation rate of COD was researched. The result showed that the COD removal rate was only about 54.3% and the degradation speed is very slow when iron-carbon micro-electrolysis treated Zidovudine wastewater　separately. However, when ultrasonic synergy micro-electrolysis to treat Zidovudine wastewater, the COD removal rate could was up to 85% and the reaction time was also decreased. Moreover, the BOD5 / COD rose from 0.15 to 0.35, which meant the wastewater became easily biodegradable.

Fe and Mn removal from mining drainage using goaf filling materials obtained from coal mining process

2015 ◽  
Vol 72 (11) ◽  
pp. 1940-1947 ◽  
Author(s):  
Liping Zhang ◽  
Aolei Chen ◽  
Hongbin Qu ◽  
Shouqiang Xu ◽  
Xue Zhang ◽  
...  
Keyword(s):  
Coal Mining ◽  
Economic Benefit ◽  
Adsorption Kinetic ◽  
Mass Ratio ◽  
Inlet Concentration ◽  
Effluent Quality ◽  
Filling Materials ◽  
Adsorption Equation ◽  
Fe And Mn ◽  
Alkaline Conditions

Coal gangue, sandy soil and clay (mass ratio 45:4:1) as goaf filling materials acquired from coal mining processes were applied to remove Fe and Mn effectively from mining drainage. The results of an adsorption kinetic study showed that the Fe adsorption equation was y = 21.454y + 8.4712, R2 = 0.9924 and the Mn adsorption equation was y = 7.5409x + 0.905, R2 = 0.9957. Meanwhile, the goaf filling materials had low desorption capacity (Fe 6.765 μg/g, Mn 1.52 μg/g) and desorption ratio (Fe 8.98%, Mn 11.04%). Experiments demonstrated that Fe and Mn from mining drainage could be removed stably at a flow rate of 1.2 L/min, Fe inlet concentration of less than 40 mg/L, Mn inlet concentration of less than 2 mg/L and neutral or alkaline conditions. During a procedure of continuous experiments, the effluent quality could meet the requirement of the ‘Code for Engineering Design of Sewage Regeneration-GB503352-2002’. A real-application project using goaf filling materials to treat mining drainage in Shendong coal mine showed that the average cost per ton of mining drainage was about 0.55 RMB, which could bring about considerable economic benefit for coal mining enterprises.

Control of VOC emissions from a flexographic printing facility using an industrial biotrickling filter

2012 ◽  
Vol 65 (1) ◽  
pp. 177-182 ◽  
Author(s):  
F. Sempere ◽  
V. Martínez-Soria ◽  
J. M. Penya-roja ◽  
A. Waalkens ◽  
C. Gabaldón
Keyword(s):  
Water Flow Rate ◽  
Biotrickling Filter ◽  
Inlet Temperature ◽  
Term Operation ◽  
Volatile Organic ◽  
Industrial Unit ◽  
Flexographic Printing ◽  
Emission Limits ◽  
Empty Bed Residence Time

The study of an industrial unit of biotrickling filter for the treatment of the exhaust gases of a flexographic facility was investigated over a 2-year period with the objective to meet the volatile organic compound (VOC) regulatory emission limits. Increasing the water flow rate from 2 to 40 m3 h−1 improved the performance of the process, meeting the VOC regulation when 40 m3 h−1 were used. An empty bed residence time (EBRT) of 36 s was used when the inlet air temperature was 18.7 °C, and an EBRT as low as 26 s was set when the inlet temperature was 26.8 °C. During this long-term operation, the pressure drop over the column of the bioreactor was completely controlled avoiding clogging problems and the system could perfectly handle the non-working periods without VOC emission, demonstrating its robustness and feasibility to treat the emission of the flexographic sector.

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