scholarly journals Determination the ammonium separating in ground water by using polyurethane-derived carrier with microbial film technique

2019 ◽  
Vol 15 (3) ◽  
pp. 68
Author(s):  
Tran Thi Kim Hoa ◽  
Huu Thi Ngan ◽  
Dao Duy Khanh ◽  
Pham Vy Anh
Keyword(s):  
Ground Water ◽  
Fixed Bed ◽  
Ammonium Concentration ◽  
Nitrification Rate ◽  
Moving Bed ◽  
Microbial Film ◽  
Carrier Size

In order to determine the ammonium treating efficiency, several factors were investigated, including: carrier size and dimension, the volume of carrier, ammonium concentration… which impact on nitrification rate by two (02) techniques: moving and fixed bed microbial film. The results indicated that with moving bed microbial film technique, the best size and dimension of carrier is a cube with 1x1x1 cm, the content of carrier is of 20% in volume. However, fixed bed microbial film technique is favored by the cube of 2x2x2 cm carrier, the content of 50% in volume.

scholarly journals Removal of organic and nitrogen in a novel anoxic fixed-bed / aerobic fluidized-moving bed integrated with a constructed wetland bio-reactor (A/O-FMCW)

2020 ◽  
Vol 167 ◽  
pp. 01001
Author(s):  
Changmiao Lai ◽  
Yu Sun ◽  
Yong Guo ◽  
Qin Cai ◽  
Ping Yang
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Removal Rate ◽  
Fixed Bed ◽  
Oxygen Demand ◽  
Integrated System ◽  
Nitrification Rate ◽  
Moving Bed ◽  
Influent Concentration

An innovative hybrid process was designed using an integrated bio-reactor based on an anoxic / aerobic process that combined a fixed bed and a fluidized-moving bed with a constructed wetland (A/OFMCW) to enhance the removal of organic material and nitrogen. The goal was to achieve stringent discharge standards for rural domestic wastewater treatment. A preliminary lab-scale investigation of about 130 days obtained an average COD (Chemical Oxygen Demand) removal rate as high as 92.2% at an average influent concentration of 319.5 mg/L. The average TN (Total Nitrogen) removal efficiency positively correlated with the attached-growth biofilm as observed by SEM (Scanning Electron Microscope), and declined from 79.1% to 53.2%. The was accompanied by a gradual increase in the average influent concentration from 16.73 to 52.01 mg/L despite the relative nitrification rate fluctuating between 92.5% and 97.9%. The entire integrated system improved the COD removal efficiency by nearly 36% and the TN by 14–28%. Classical autotrophic nitrification and heterotrophic denitrification were the main mechanisms responsible for the elimination of pollutants, and the latter was determined to be the limiting step. Overall, this study provides an effective and less expensive alternative method to apply or upgrade DWWT (Decentralized Wastewater Treatment).

scholarly journals Biosorption of Fluoride from Synthetic and Ground Water Using Chlorella vulgaris Immobilized in Calcium Alginate Beads in an Upflow Packed Bed Column

2017 ◽  
Vol 61 (3) ◽  
pp. 188 ◽  
Author(s):  
Poornima G. Hiremath ◽  
Thomas Theodore
Keyword(s):  
Experimental Data ◽  
Ground Water ◽  
Chlorella Vulgaris ◽  
Water Samples ◽  
Packed Column ◽  
Fluoride Concentration ◽  
Fixed Bed ◽  
Fluoride Removal ◽  
Fluoride Ions ◽  
Fluoride Adsorption

The potential of immobilized Chlorella vulgaris to remove fluoride from synthetic and real ground water samples in a fixed bed was investigated. The effect of important kinetic parameters including column bed height, feed flow rate and influent fluoride concentration of solution on fluoride removal was studied. Thomas, Yoon-Nelson, and BDST models were used to analyze the experimental data and understand the influence on biosorption performance. The models’ predictions were in good agreement with the experimental data for all the process parameters studied, indicating that the models were suitable for fixed-bed column design. Fluoride adsorption was reversible. Desorption of fluoride ions was accomplished by pumping 0.1 N HCl solution. The reusability of adsorbent was studied by subjecting column to repeated cycles of fluoride adsorption and desorption. The suitability of immobilized C. vulgaris adsorbent for fluoride removal from ground water samples of Pavagada taluk, Tumakuru district was studied in the packed column.

A pilot-plant study of a moving-bed biofilm reactor system using PVA gel as a biocarrier for removals of organic carbon and nitrogen

2007 ◽  
Vol 55 (8-9) ◽  
pp. 135-141 ◽  
Author(s):  
J.D. Rouse ◽  
O. Burica ◽  
M. Stražar ◽  
M. Levstek
Keyword(s):  
Organic Contaminants ◽  
Pilot Plant ◽  
Biofilm Reactor ◽  
Maximum Efficiency ◽  
Nitrification Rate ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Carbon And Nitrogen ◽  
Pva Gel ◽  
Pilot Plant Study

A pilot-plant study was conducted to evaluate the performance of a moving-bed biofilm reactor process using PVA-gel beads as a biocarrier. Real primary-settled wastewater was fed to the pre-denitrification system and removals of nitrogenous and organic contaminants were evaluated over a 1-year period. The results demonstrated that at a total nitrogen (TN) loading of 18 mg/L.h, a TN removal efficiency in keeping with and even exceeding the theoretical maximum efficiency based on the level of internal recycle, was possible and a nitrification rate of 15 mg/L.h was sustained with a HRT of only 2.5 h at 15 °C. Furthermore, soluble COD and BOD5 in the effluent of the pilot plant were reduced to levels well below most regulatory discharge limits. In addition, the possibility of using this biocarrier in a system, including the elimination of waste organic sludge, was discussed.

scholarly journals The influence of large wood and rootwad on flow patterns and bed morphology in a moving bed channel

2018 ◽  
Vol 40 ◽  
pp. 02044
Author(s):  
Su-Chin Chen ◽  
Min-Chih Liang ◽  
Samkele Tfwala
Keyword(s):  
Field Experiments ◽  
Morphological Changes ◽  
Fixed Bed ◽  
Flow Patterns ◽  
Large Wood ◽  
River Channels ◽  
Moving Bed ◽  
Bed Topography ◽  
Bed Elevation ◽  
Elevation Changes

Studying large wood in river channels can help gain insight on their form and processes. Over the preceding decade, laboratory and field experiments have been used to explain wood dynamics, flow patterns and sediment transport. Moreover, field experiments are sparse, while laboratory experiments have focused mostly on fixed bed to capture their entrainment. To enhance our scientific understanding on logs of different morphology, this study designed an experimental flume to investigate the effects of log presence on flow and bed topography in a moving bed channel. Two log configurations were used, with and without rootwad. Wood pieces had a length of 0.2 m, diameter 0.05 m and a density of approximately 760 kg/m3. Rootwad were simulated by joining 0.06 m wood pieces, having a diameter of 0.02 m to the base of the log pieces at an angle of 30°. The experiments were carried out in a 4 m long flume, 0.6 m width and 0.6 m deep, and having a slope of 0.001. The experimental bed zone was paved with uniform sand, d50 = 0.750 mm, of 0.1 m thickness. Flow in the channel was set such that it was below the critical flow for wood entrainment, and it ranged between 0.0015 to 0.005 m3/s. Three different orientations of the log were considered, namely parallel, oblique and transverse to flow. Bed evolution was monitored using a camera and a laser mounted on a moving motor frame. This research shows that log orientation and the presence of rootwad dictate bed elevation changes and stability of single wood pieces. In addition, the contrast of morphological changes caused by the presence of abundant wood in a moving bed is crucial in determining large wood appropriate for river restoration. Our study provokes fascinating questions for future investigations.

scholarly journals The Fate of Bacteriophages in Recirculating Aquaculture Systems (RAS)—Towards Developing Phage Therapy for RAS

Antibiotics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 192 ◽  
Author(s):  
Gabriel M.F. Almeida ◽  
Kati Mäkelä ◽  
Elina Laanto ◽  
Jani Pulkkinen ◽  
Jouni Vielma ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Phage Therapy ◽  
Fixed Bed ◽  
Controlled Study ◽  
Water Volume ◽  
Flavobacterium Columnare ◽  
Moving Bed ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

Aquaculture production has increased tremendously during the last decades, and new techniques have been developed, e.g., recirculating aquaculture systems (RAS). In RAS, the majority of water volume is circulated via mechanical and biological filters and reused in the tanks. However, the prevention and treatment of diseases in these systems are challenging, as the pathogens spread throughout the system, and the addition of chemicals and antibiotics disrupts the microbiome of the biofilters. The increasing antibiotic resistance has made phage therapy a relevant alternative for antibiotics in food production. Indeed, as host-specific and self-replicating agent they might be optimal for targeted pathogen eradication in RAS. We tested the survival and spread of Flavobacterium columnare -infecting phage FCL-2 in recirculating aquaculture fish farm with rainbow trout (Oncorhynchus mykiss) in a fully controlled study. After a single addition, phage persisted in water samples collected from tank, fixed bed, moving bed, and aeration unit up to 14 days, and in the water of rearing tanks, rainbow trout mucus, and bioreactor carrier media from the fixed and moving bed biofilters for 21 days. Furthermore, phage adsorbed preferentially to moving bed carrier media, which contained biofilm attached and from which higher phage numbers were recovered. This study shows phages as a potent strategy for maintaining biosecurity in RAS systems.

HS retention with Ca-based sorbents in a pressurized fixed-bed reactor: application to moving-bed design

Fuel ◽  
2005 ◽  
Vol 84 (5) ◽  
pp. 533-542 ◽  
Author(s):  
J ADANEZ ◽  
A ABAD ◽  
F GARCIALABIANO ◽  
L DEDIEGO ◽  
P GAYAN
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Moving Bed ◽  
Reactor Application
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