Study on Optimal Controlling Strategy of Backwashing Process in Biological Aerated Filter

2014 ◽  
Vol 507 ◽  
pp. 874-879
Author(s):  
Shou Bin Zhang ◽  
Li Ping Qiu ◽  
Kang Xie
Keyword(s):  
Control Strategy ◽  
Water Flux ◽  
Comprehensive Analysis ◽  
Experimental Results ◽  
Biological Aerated Filter ◽  
Treatment Efficiency ◽  
Operating Stability ◽  
Before And After ◽  
Aerated Filter ◽  
Water Rinsing

Basing on comprehensive analysis of the existing backwashing modes of Biological Aerated Filter (BAF), air and water combined backwashing was taken as the most efficient and economic mode for BAF backwashing in this study to ensure operating stability and backwashing effect. Then the relevant parameters, involved in air flushing, air and water combined washing and water rinsing, were optimized reasonably. In this paper, the optimal backwashing control strategy was recommended as follows: air backwashing 3 minutes with air backwashing intensity of 10 L/m2·s,secondly, air and water combined backwashing 3 minutes with both air and water backwashing intensity of 10 L/m2·s,at last,water rinsing for 9 minutes with water rinsing intensity of 10 L/m2·s. To discuss the influence of backwashing process on treatment efficiency of BAF, the changes of headloss and contaminants concentration of BAF before and after backwashing was also investigated in this study. The experimental results revealed that under the optimal backwashing control strategy the water flux could be recovered soon after backwashing. Although the contaminants concentration in initial filtrated water increased slightly, the treatment efficiency of BAF reactors could be back to normal in 2 hours.

The Experimental Study of Contaminant Removal in Water Quenched Slag Biological Aerated Filter (BAF)

2012 ◽  
Vol 602-604 ◽  
pp. 1171-1174
Author(s):  
Long Long Gao ◽  
Yan Zhen Yu ◽  
Miao Wan Li ◽  
Yu Xing Zhou ◽  
Hua Dong Zhang
Keyword(s):  
Experimental Study ◽  
Wastewater Treatment ◽  
Removal Rate ◽  
Filter Material ◽  
Experimental Results ◽  
Filter Medium ◽  
Contaminant Removal ◽  
Biological Aerated Filter ◽  
Aerated Filter ◽  
Second Use

In order to effectively resolve pollution issue of water quenched slag and its comprehensive use or second use of materials, the water quenched slag filter material is developed using water quenched slag with the addition of adhesion-increasing agent and porogen by commingle, pelletizing and curing. Experimental results indicate that water quenched slag filter material is used as filter medium in biological aerated filter for wastewater treatment,and the removal rate of COD, NH3-N comes up to 84.62%,90.20% respectively. The filter material is much more predominant and possesses a much wider application prospect in the treatment of wastewate.

Aeration control for simultaneous nitrification-denitrification in a biological aerated filter using internal model approach

2006 ◽  
Vol 54 (8) ◽  
pp. 129-136 ◽  
Author(s):  
C. Lemoine ◽  
M. Payraudeau ◽  
J. Meinhold
Keyword(s):  
Control Strategy ◽  
Pilot Plant ◽  
Control Strategies ◽  
Biological Aerated Filter ◽  
Control Approach ◽  
Pilot Plant Scale ◽  
Improved Performance ◽  
Aerated Filter ◽  
Air Flow Velocity ◽  
Aeration Control

Experience has shown that simultaneous nitrification/denitrification in a biological aerated filter is possible. However these systems react very sensitively to the aeration control strategies applied. Poorly adapted control strategies induce a strong decrease in treatment efficiency. A new control strategy for simultaneous N/DN is developed. The strategy proposed makes use of ammonia measurements and the inlet and outlet: a Feedback/Feedforward block. Passing by a calculation of the load to be eliminated, an estimation of the air flow velocity to be applied is carried out dynamically. A retroactive loop corrects this prediction in order to reach exactly the desired set point. This control approach has been implemented and tested at pilot plant scale for a period of 18 months. The pilot plant consists of two coupled BAF cells, reflecting closely industrial scale situations. Comparative studies reveal clearly the improved performance of the developed FF/FB control strategy compared to classical controllers. The benefits include 5% increase in nitrogen removal performance and a reduction of 15 to 20% in air requirement, offering a rapid return of investment costs.

Research on Removal Performance of Integrated Biological Aerated Filter to Sewage Treatment

2011 ◽  
Vol 271-273 ◽  
pp. 357-362
Author(s):  
Xiu Ju Duan ◽  
Qiang He ◽  
Ya Li Liu
Keyword(s):  
Small Volume ◽  
Sewage Treatment ◽  
Influence Factors ◽  
Biological Aerated Filter ◽  
Treatment Efficiency ◽  
Research Focus ◽  
Volume Loading ◽  
Treatment Performance ◽  
Aerated Filter ◽  
High Treatment

Biological Aerated Filter has many advantages, such as small volume, high treatment efficiency, etc. This research focus on sewage treatment performance of Integrated Biological Aerated Filter (IBAF), have test under different conditions; research on affections of such influence factors as aeration, CODCr volume loading, HRT, temperature, the height of fillers layer on IBAF, and optimize its functional parameter; discuss regularities of sewage treatment of IBAF under different oprating conditions, adopt feasible measures to guarantee its exceed water quality.

Study on the Treatment of Domestic Sewage with Water Quenched Slag Biological Aerated Filter

2011 ◽  
Vol 306-307 ◽  
pp. 1541-1544
Author(s):  
Yan Zhen Yu ◽  
Yan Feng ◽  
Lei Cheng
Keyword(s):  
Blast Furnace ◽  
Removal Rate ◽  
Primary Standard ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Biological Aerated Filter ◽  
Wastewater Discharge ◽  
Treatment Efficiency ◽  
Aerated Filter ◽  
Quality Indexes

The blast furnace water quenched slag has characteristics such as porous and superficial roughness, so it can be modified and cranked out a filter media. The treatment efficiency of domestic sewage with water quenched slag biological aerated filter (BAF) was researched in this paper. And the removal rate of organic compound, ammonium, SS, and chroma was also investigated. The results showed that the quality indexes of the domestic sewage after treatment met the primary standard of the national integrated wastewater discharge standard (GB8978-1996). So the purpose of the waste harnessed by other waste is achieved. The applicative prospect of blast furnace water quenched slag on domestic sewage treatment is very broad.

Effects of Air/Liquid Ratio on Treatment Efficiency of Textile Wastewater in a Biological Aerated Filter Reactor

2013 ◽  
Vol 316-317 ◽  
pp. 241-244 ◽  
Author(s):  
Xu Jie Lu
Keyword(s):  
Activated Carbon ◽  
Textile Wastewater ◽  
Ammonia Nitrogen ◽  
Double Layers ◽  
Biological Aerated Filter ◽  
Treatment Efficiency ◽  
Liquid Ratio ◽  
N Removal ◽  
Small Footprint ◽  
Aerated Filter

A biologically aerated filter (BAF) is a novel, flexible and effective bioreactor that provides a small footprint process option at various stages of wastewater treatment. Double layers of activated carbon and ceramsite were applied in the biological aerated filter reactor. An experiment was conducted under laboratory conditions to investigate the treatment efficiencies at different air/liquid ratios. The experimental results obtained showed that air/liquid ratio had a greater effect on NH4+–N removal than COD removal. More than 80% ammonia nitrogen was removed at 2 of air/liquid ratio. However, less than 50% COD was removed at 2 of air/liquid ratio.

Bioaugmentation Treatment of Bromoamine Acid Wastewater with Sphingomonas Sp. FL

2011 ◽  
Vol 183-185 ◽  
pp. 814-818 ◽  
Author(s):  
Li Fan
Keyword(s):  
Retention Time ◽  
Removal Rate ◽  
Sole Source ◽  
Biological Aerated Filter ◽  
Treatment Efficiency ◽  
Efficient Removal ◽  
Combined Process ◽  
Hydraulic Loading ◽  
Aerated Filter

One effective bromoamine acid (BAA) degrading strain FL was isolated previously with the ability to use BAA as the sole source of carbon and energy. The strain FL was applied in a combined process of microelectrolysis (ME) and biological aerated filter (BAF) to treat the bromoamine acid wastewater, and the treatment efficiency was investigated. It was shown that when the influent CODcr was lower than 1000 mg L-1, and the total hydrolytic retention time (HRT) was 37.7 h, the removal rate of chrominance and CODcr could reach 95.3% and 77.3% respectively. Most of the chrominance was removed by the ME treatment, while the removal of CODcr is mostly owned to the BAF treatment. After long-term contact with the BAA wastewater, the strain FL became one of the predominent species in BAF. When the system was subjected to hydraulic loading shock, the strain FL ensured the efficient removal of chrominance and BAA.

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