Microwave regeneration of biological activated carbon

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
Daoji Wu ◽  
Shujie Li ◽  
Ning Wang
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Bet Surface Area ◽  
Raw Water ◽  
Biological Activated Carbon ◽  
Microwave Regeneration ◽  
Iodine Values

AbstractSpent biological activated carbon (SAC) in a drinking water treatment plant has been regenerated with microwaves, and the regeneration effects were evaluated through iodine values, surface chemistry, surface structure energy and surface morphology by comparison with unused activated carbon (UAC). On this basis, the performance of regenerated activated carbon (RAC) was investigated by methylene blue adsorption and raw water clarification. The results showed that the iodine value of RAC recovered to 98.1 % of that of UAC, and that the BET surface area of RAC (778 m

scholarly journals Pesticide removals in the nitrifying expanded-bed filter at drinking water treatment plant

2020 ◽  
Vol 15 (1) ◽  
pp. 1-13
Author(s):  
Nguyet Thi-Minh Dao ◽  
The-Anh Nguyen ◽  
Viet-Anh Nguyen ◽  
Mitsuharu Terashima ◽  
Hidenari Yasui
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Cost Effective ◽  
Water Treatment Plant ◽  
Field Analysis ◽  
Expanded Bed ◽  
Biological Activated Carbon

The occurrence of pesticides even at low concentrations in drinking water sources might induce potential risks to public health. This study aimed to investigate the removal mechanisms of eight pesticides by the nitrifying expanded-bed filter using biological activated carbon media at the pretreatment of a drinking water plant. The field analysis demonstrated that four pesticides Flutolanil, Buprofezin, Chlorpyrifos, and Fenobucard, were removed at 82%, 55%, 54%, and 52% respectively, while others were not significantly removed. Under controlled laboratory conditions with continuous and batch experiments, the adsorption onto the biological activated carbon media was demonstrated to be the main removal pathway of the pesticides. The contribution of microorganisms to the pesticide removals was rather limited. The pesticide removals observed in the field reactor was speculated to be the adsorption on the suspended solids presented in the influent water. The obtained results highlighted the need to apply a more efficient and cost-effective technology to remove the pesticide in the drinking water treatment process. Keywords: biological activated carbon; drinking water treatment; nitrifying expanded-bed filter; pesticide removal.

Influence of backwashing on the microbial community in a biofilm developed on biological activated carbon used in a drinking water treatment plant

2007 ◽  
Vol 55 (8-9) ◽  
pp. 173-180 ◽  
Author(s):  
I. Kasuga ◽  
D. Shimazaki ◽  
S. Kunikane
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Biological Activated Carbon ◽  
Drinking Water Treatment Plant ◽  
Relative Abundances ◽  
Rdna Analysis

The influence of backwashing on the biofilm community developed on biological activated carbon (BAC) used in a drinking water treatment plant was investigated by means of bacterial cell enumeration and terminal-restriction fragment length polymorphism (T-RFLP) fingerprinting analysis of bacterial and eukaryotic ribosomal RNA genes (rDNA). After backwashing, the attached bacterial abundance in the top layer of the BAC bed decreased to 64% of that before backwashing. The community level changes caused by backwashing were examined through the T-RFLP profiles. In the bacterial 16S rDNA analysis, the relative abundances of some terminal-restriction fragments (T-RFs) including the Planctomycetes-derived fragment increased; however, the relative abundances of some T-RFs including the Betaproteobacteria-derived fragments decreased. In the eukaryotic 18S rDNA analysis, the relative abundances of some T-RFs including the protozoan Cercozoa-derived fragments increased; however, the relative abundances of some T-RFs including the metazoan Chaetonotus- and Paratripyla-derived fragments decreased. The T-RFLP analysis suggests that backwashing can cause changes in the relative compositions of microorganisms in a BAC biofilm in the top layer of the bed.

scholarly journals Comparison of invertebrate removal by traditional-BAC and pre-BAC treatment processes: verification in a full-scale drinking water treatment plant

2017 ◽  
Vol 18 (4) ◽  
pp. 1261-1269
Author(s):  
Zhiling Wu ◽  
Hongbin Chen
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Reproductive Rate ◽  
Full Scale ◽  
Biological Activated Carbon ◽  
Treatment Processes

Abstract Invertebrate removal by traditional biological activated carbon (tra-BAC) and pre-BAC treatment processes was investigated in a full-scale water treatment plant. The results showed that invertebrate reproduction occurred in both BAC filters, but the invertebrate abundance in the finished water processed by tra-BAC was about 15 times greater than that processed using the pre-BAC process. In the pre-BAC process, the sand filter was placed after the BAC filter, and sand filtration removed most of the invertebrates, with an average removal efficiency of 91.1%. However, the pre-BAC filter, which was positioned behind the sedimentation tank, needed to be backwashed more frequently than the tra-BAC filter because of the high turbidity of the inlet water. The frequent backwashing reduced the biomass on the activated carbon and decreased the invertebrate reproductive rate. The results of this study are helpful for evaluating the pre-BAC treatment process in drinking water treatment plants.

scholarly journals Optimization of ACH Coagulant, Settling Time and Powdered Activated Carbon as Coagulant Aid with Economic Analysis

2021 ◽  
Keyword(s):  
Activated Carbon ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Settling Time ◽  
Raw Water ◽  
Economic Study ◽  
Optimal Process ◽  
Water Turbidity ◽  
Aluminum Sulphate ◽  
Actived Carbon

<p>Regular water treatment-plant (WTP) comprises of a number of units. Of course, problems exist throughout design and operation of the WTP units. Consequently, the current re-search aimed to minimize the shortcomings of the coagulation, sedimentation, and the adsorption methods through applying optimal process for these units. Additionally, eco-nomic analysis and the derivation mathematical models for the new coagulant (Aluminum Chlorohydrate (ACH)) and the traditional aluminum sulphate coagulant (Alum) were an-other objective of this work. Optimum coagulants for alum and ACH were obtained and presented for different raw water turbidities. The optimum settling time of 30 minutes and 40 minutes have been found for the settling of 1000 and 2000 NTU raw water sam-ples. Best dosages of 0.1 and 0.25 g/L of powdered actived carbon (PAC) were obtained for raw water turbidity of 419, and 1000 NTU which increased the removal efficiency of 28.95%, and 25.71%, respectively. Furthermore, the economic study for alum and ACH revealed that using ACH instead of alum led to reduction of cost by 32%. Commonly, it can be concluded that using ACH instead of alum is better because it is cheaper and more efficient. The predicted equations for the optimum dosages (Y) for alum (mg/L) and ACH (µl/L) dosages (X) were Y= 0.04 X + 14.42, and Y = 0.01 X + 0.72, respectively.</p>

Influence de la température sur le rendement des filtres au charbon activé biologique

1989 ◽  
Vol 16 (6) ◽  
pp. 820-828 ◽  
Author(s):  
Sylvie Letendre ◽  
Raymond Desjardins ◽  
Line Fortin ◽  
Pierre Lafranche ◽  
François G. Brière
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Treatment Plant ◽  
Warm Season ◽  
Water Treatment Plant ◽  
Activated Carbon Adsorption ◽  
Temperature Variations ◽  
Biological Activated Carbon ◽  
Carbon Adsorption ◽  
Start Up

To evaluate the performance of the biological activated carbon filters at the Sainte-Rose water treatment plant in Ville de Laval (Québec), water and carbon samples were taken over a period of 150 days. Sampling began 1 year after filter start-up. The filters were then in a pseudo-equilibrium state. During winter, the removal rate of organic material is reduced because of lower water temperatures which affect bacterial activity. Bacterial density in the upper layers of the filter is influenced by temperature variations. During the warm season, bacteria counts are higher in the upper layer of the carbon, in the filter effluent, and in the backwash water. For equal carbon masses, bituminous carbon and peat-based extruded carbon have similar removal rates. However, for equal volumes, bituminous carbon is more efficient. Key words: biological activated carbon, adsorption, filtration, drinking water, organic matter.

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