scholarly journals The influence of electrode spacing on the performance of bioretention cell coupled with MFC

2021 ◽  
Vol 8 (8) ◽  
pp. 202024
Author(s):  
Wang Ya-Jun ◽  
Chen Tian-Jing ◽  
Li Jin-Shou ◽  
Si Yun-Mei ◽  
ZhaoYang Wang
Keyword(s):  
Water Treatment ◽  
System Performance ◽  
Output Voltage ◽  
Production Efficiency ◽  
Removal Rate ◽  
Carbon Sources ◽  
Electricity Production ◽  
Organic Load ◽  
Electrode Spacing ◽  
Cod Removal Rate

In order to explore the influence of electrode spacing on the performance of the enhanced bioretention system, four bioretention cells with microbial fuel cell (BRC–MFC) systems with different electrode spacing were designed, and the effect of electrode spacing on system performance was revealed by analysing its water treatment capacity and electricity production efficiency. The results showed that BRC–MFC had good water treatment capacity and could produce electricity simultaneously. Compared with other BRC–MFC systems with spacing, the BRC3 system (with an electrode spacing of 30 cm) had significant water treatment capacity under different organic loads, especially under high organic load (C/N = 10) operation, COD removal rate was as high as 98.49%, NH 4 + − N removal rate was as high as 97%, and it had a higher output voltage of 170.46 ± 6.17 mV. It could be seen that proper electrode spacing can effectively improve the water treatment capacity of the BRC–MFC system. This study provided a feasible method for improving the performance of the BRC–MFC system, and revealed the relevant mechanism. A proper electrode spacing with sufficient carbon sources could effectively improve the water treatment capacity of the BRC–MFC system.

scholarly journals Technological Effectiveness of Sugar-Industry Effluent Methane Fermentation in a Fluidized Active Filling Reactor (FAF-R)

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6626 ◽  
Author(s):  
Marcin Dębowski ◽  
Marcin Zieliński
Keyword(s):  
Production Efficiency ◽  
Sugar Industry ◽  
Removal Rate ◽  
Effluent Treatment ◽  
Organic Load ◽  
Methane Fermentation ◽  
Treated Effluent ◽  
Load Rate ◽  
Industry Effluent ◽  
The Impact

Technological solutions allowing the increase of the technological efficiency of anaerobic methods of wastewater treatment are still under investigation. The weaknesses of these solutions can be limited by the use of active fillings. The aim of the present study was to determine the impact of fluidized active filling on the effectiveness of anaerobic treatment of sugar-industry effluent, the production efficiency and the qualitative composition of the biogas produced. High, comparable (p = 0.05) effluent treatment results were observed at tested organic load rates between 4.0 and 6.0 kg COD (Chemical Oxygen Demand)/m3·d. The COD removal rate reached over 74%, biogas yields ranged from 356 ± 25 to 427 ± 14 dm3/kg CODremoved and the average methane contents were approximately 70%. A significant decrease in effluent treatment efficiency and methane fermentation was observed after increasing the organic load rate to 8.0 kg COD/m3·d, which correlated with decreased pH and FOS/TAC (volatile organic acid and buffer capacity ratio) increased to 0.44 ± 0.2. The use of fluidized active filling led to phosphorus removal with an efficiency ranged from 64.4 ± 2.4 to 81.2 ± 8.2% depending on the stage. Low concentration of total suspended solids in the treated effluent was also observed.

Anaerobic Treatment of Cheese Dairy Wastewater Using the SNC Bioreactor

1993 ◽  
Vol 28 (3) ◽  
pp. 597-620 ◽  
Author(s):  
Catherine N. Mulligan ◽  
Bechara F. Safi ◽  
Jacques Meunier ◽  
Jean Chebib
Keyword(s):  
Retention Time ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Gas Production ◽  
Cod Removal ◽  
Dairy Wastewater ◽  
Organic Load ◽  
Whey Permeate ◽  
Cod Removal Rate

Abstract The SNC multiplate reactor (1,200 L) has been developed and tested to determine chemical oxygen demand (COD) removal, nutrient requirement, and gas production from the anaerobic treatment of effluents generated at the Agropur (Notre Dame-du-Bon-Conseil, Quebec) and Nutrinor cheese dairies (Chambord, Quebec). At the Agropur plant, wastewater (3,000 mg/L COD) was treated the best at a retention time of 12 h. Using this retention time, effluents containing whey with organic loads of 10.2 to 41.6 kg COD/m3/day could be treated at a 84% COD removal rate. When the reactor was subjected to shock by increasing the organic load suddenly from 8.9 to 31 kg COD/m3/day, the total COD removal decreased to 72% and then returned to 86% after 7 days. Hydrology tests indicated that the reactor functions as a series of completely mixed stirred tanks. At Nutrinor, using a 12-h retention time and diluted whey permeate (20,000 mg/L COD), total COD removal was 86% and gas production was 12.0 m3/m3/day for a loading of 36.5 kg COD/m3/day. Nutrient supplementation was not required. For experiments performed with different proportions of wastewater (2,000 mg/L COD) to whey permeate (70,000 mg/L COD) results of 89% total and 93% soluble COD removal with a gas production of 11 m3/m3/day for a loading of 25 kg COD/m3/day were obtained. Retention times were varied from 18 to 60 h to correspond to initial CODs of 20,000 to 70,000 mg/L. In conclusion, this reactor functions in a superior manner to other published anaerobic treatment systems.

Performance of a modified RBC system in simulated municipal wastewater treatment

2012 ◽  
Vol 66 (9) ◽  
pp. 2014-2019
Author(s):  
Tang Yun-lu ◽  
Liu Dong-fang ◽  
Meng Xian-rong ◽  
Yu Jie ◽  
Wang Jin ◽  
...  
Keyword(s):  
Rotational Speed ◽  
System Performance ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Engineering Application ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Municipal Wastewater Treatment ◽  
Positive Role ◽  
Cod Removal Rate

A new method based on rotating biological contactor (RBC) was employed for solving the problems of long hydraulic retention times (HRT) low specific surface area and organic loading rates (OLR) in conventional RBCs. The system showed its particular adsorption ability of microorganisms in the biofilm-attaching period. Microbes on the first cage were observed in comparison with the second one. Packing biodisc also had a good shock load tolerance. It was observed that the system performance improved at higher HRTs, while at the increased level of input OLR, the removal performance worsened slightly. The positive role of rotational speed in the treatment of municipal wastewater was more pronounced in the range of 10–12 rpm. Chemical oxygen demand (COD) removal rate achieved 94% under the optimal operating conditions, which were HRT of 1.5 h, rotational speed of 9.9 rpm. The modified RBC system is highly beneficial to engineering application for better system performance and lower energy consumption.

Study on Preparation and Properties of Microbial Flocculant/Sepiolite Fibers Water Treatment Materials

2014 ◽  
Vol 694 ◽  
pp. 391-395
Author(s):  
Zhen Hua Guo ◽  
Jing Li Feng ◽  
Lei Zhang ◽  
Hai Zhu ◽  
Shu Xian Zhang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Removal Rate ◽  
Paenibacillus Polymyxa ◽  
Mass Ratio ◽  
Removal Capacity ◽  
Cod Removal Rate ◽  
Pollutants Removal ◽  
Main Components ◽  
Microbial Flocculant ◽  
Fast Settling

This Paenibacillus polymyxa (P1) was fermented under the specific conditions and extracted the microbial flocculant (MBFP1) whose main components were polysaccharide. Compounded the MBFP1 and modified sepiolite fibers according to a certain mass ratio to make the microbial flocculant/sepiolite fibers water treatment materials (MBFSF), then analyzed their microstructure by SEM,and studied on the pollutants removal capacity in domestic sewage.The results show that,COD removal rate in domestic sewage can reach 97.2%,when pH=7.2 and the addition quantity of MBFSF is 15mg/L,in which the composite mass ratio of MBFP1 and sepiolite fibers is 5:2.Therefore,MBFSF has many advantages such as little dosage,high flocculating rate,fast settling velocity and no pollution,etc.

scholarly journals Treatment of Cheese Whey Wastewater Using an Expanded Granular Sludge Bed (EGSB) Bioreactor with Biomethane Production

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 931
Author(s):  
Abumalé Cruz-Salomón ◽  
Edna Ríos-Valdovinos ◽  
Francisco Pola-Albores ◽  
Selene Lagunas-Rivera ◽  
Rosa Isela Cruz-Rodríguez ◽  
...  
Keyword(s):  
Cheese Whey ◽  
Negative Impact ◽  
Removal Rate ◽  
Granular Sludge ◽  
Organic Load ◽  
Biochemical Methane Potential ◽  
Stable Conditions ◽  
Methane Potential ◽  
Biomethane Production ◽  
Cod Removal Rate

Cheese whey wastewater (CWW) is the major by-product of the dairy industry. CWW is produced in large quantities, has varied characteristics and is usually disposed of. The disposal of CWW causes a negative impact on the environment of different agroindustrial areas due to the physic-chemical composition that significantly increases its high organic load and nutrients. For this reason, the aim of this work was to carry out an evaluation of the anaerobic treatability of an Expanded Granular Sludge Bed (EGSB) bioreactor as a new sustainable alternative for treatment of these effluents with bioenergy production. In this study, the bioreactor was operated under stable conditions (i.e., buffer index of 0.23 ± 0.1, pH 7.22 ± 0.4 and temperature 26.6 ± 1.4 °C) for 201 days. During evaluation the hydraulic retention time (HRT) was 6 and 8 days, and it was buffered with NaHCO3. At these conditions, the COD removal rate and biochemical methane potential (BMP) were 90, 92%; and 334, 328 mLCH4/gCOD, respectively. The evidence found in this study highlighted that the CWW is a viable substrate to be treated in the EGSB bioreactor as long as it keeps buffered. Furthermore, the process to treat the CWW in an EGSB bioreactor can be a sustainable alternative to simultaneously solve the environmental pollution that this agro-industry confronts and produce renewable and environmentally-friendly bioenergy.

Start-Up of the Anaerobic Fluidized Bed

2014 ◽  
Vol 522-524 ◽  
pp. 695-698
Author(s):  
Xiao Ming Sun ◽  
Jing Yang Liu ◽  
Qi Qiao
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Organic Load ◽  
Municipal Sewage ◽  
Organic Loading Rate ◽  
Start Up ◽  
Cod Removal Rate ◽  
Anaerobic Digester Sludge

Inoculated with anaerobic digester sludge of municipal sewage treatment plant, using the method of organic load increasing, anaerobic fluidized beds was started-up after 82 days. At organic loading rate of 5kgCOD/m3·d, the COD removal rate was 81%. The structure of this biofilm is good and propitious to further domestication.

A Research on Coal Washing Water Treatment with Keratin Additives

2012 ◽  
Vol 524-527 ◽  
pp. 930-934
Author(s):  
Bi Chen ◽  
Zhong Jiang Tang
Keyword(s):  
Water Treatment ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Feather Keratin ◽  
Operation Conditions ◽  
Cod Removal Rate ◽  
Washing Water

Through adding keratin additives to coal washing water with SS removal rate as an index, this paper draws a conclusion that the best operation conditions of treatment are: adding feather keratin flocculation additives by 2 g / L to the wastewater of pH value 5～7, treating it at 20～30°C for 30 minutes. The SS removal rate is over 98%，meanwhile COD removal rate can reach 34% under the conditions.

scholarly journals A new constructed wetland combined with microbial desalination cell and its application

2021 ◽  
Author(s):  
zhimiao Zhao ◽  
Cheng Mengqi ◽  
Li Yanan ◽  
Song Xinshan ◽  
Wang Yuhui ◽  
...  
Keyword(s):  
Power Generation ◽  
Water Treatment ◽  
Constructed Wetland ◽  
Saline Water ◽  
Removal Rate ◽  
Design Parameters ◽  
Electrochemical Technology ◽  
Optimizing Design ◽  
Microbial Desalination Cell ◽  
Cod Removal Rate

Abstract Wastewater recycling can alleviate the shortage of water resources. Saline water is seldom treated with biological processes and the recycling utilization is low. Constructed wetland (CW) is a safe and economical ecological water treatment. However, the saline water treatment performance of CW is not good. Microbial desalination cell (MDC) utilizing the bioelectro-chemical principle achieves the functions of desalination and power generation. In this study, MDC was used to strengthen CW to form a composite system, MDC-CW, through optimizing design parameters. MDC-CW was applied in the treatment of salt-containing water. The average total nitrogen removal rate in MDC-CW-P1 reached 87.33% and the average COD removal rate was 92.79%. The average desalination rate of MDC-CW-P1 was 55.78% and the average voltage of MDC-CW-P1 reached 0.40 mV. It was found that planting canna indica in the MDC-CW was conducive to the functions of desalination and power generation. The above results were also verified by the microbial testing results of gravels in substrate, plant rhizosphere and electrodes. In addition, the decontamination of the device mainly depended on the functions of the bacteria commonly used in water treatment, such as Proteobacteria and Bacteroidetes, whereas the generation of power depended on the function of Geobacter. Salt ions moved spontaneously to the cathode and anode under the premise of current generation, so that the desalination function was realized under the selective isolation function of exchange membranes. The device design and laboratory application of MDC-CW experimentally accomplished the electrochemical technology and enlarged the treatment scale of CW.

Analysis of organic removal rates in the aerated submerged fixed film process

1998 ◽  
Vol 38 (8-9) ◽  
pp. 213-221 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Ibrahim A. Al-Ghusain
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Removal Rates ◽  
Hydraulic Loading ◽  
Organic Removal ◽  
Wide Range ◽  
Fixed Film ◽  
Cod Removal Rate ◽  
And Performance

Performance data from a pilot-plant employing the four-stage aerated submerged fixed film (ASFF) process treating domestic wastewater were analyzed to examine the organic removal rates. The process has shown high BOD removal efficiencies (> 90%) over a wide range of hydraulic loading rates (0.04 to 0.68 m3/m2·d). It could also cope with high hydraulic and organic loadings with minimal loss in efficiency due to the large amount of immobilized biomass attained. The organic (BOD and COD) removal rate was influenced by the hydraulic loadings applied, but organic removal rates of up to 104 kg BOD/ m2·d were obtained at a hydraulic loading rate of 0.68 m3/m2·d. A Semi-empirical model for the bio-oxidation of organics in the ASFF process has been formulated and rate constants were calculated based on statistical analysis of pilot-plant data. The relationships obtained are very useful for analyzing the design and performance of the ASFF process and a variety of attached growth processes.

The comparison of trichloroethylene removal rates by methane- and aromatic-utilizing microorganisms

1998 ◽  
Vol 38 (7) ◽  
pp. 19-24 ◽  
Author(s):  
C.-J. Lu ◽  
C. M. Lee ◽  
M.-S. Chung
Keyword(s):  
Cell Concentration ◽  
Removal Rate ◽  
Carbon Sources ◽  
Batch Reactors ◽  
Initial Cell Concentration ◽  
Removal Rates ◽  
Initial Cell ◽  
Toluene Concentration ◽  
Cell Source ◽  
Removal Efficiencies

The comparison of TCE cometabolic removal by methane, toluene, and phenol utilizers was conducted with a series of batch reactors. Methane, toluene, or phenol enriched microorganisms were used as cell source. The initial cell concentration was about 107 cfu/mL. Methane, toluene, and phenol could be readily biodegraded resulting in the cometabolic removal of TCE. Among the three primary carbon sources studied, the presence of phenol provided the best cometabolic removal of TCE. When the concentration of carbon source was 3 mg-C/L, the initial TCE removal rates initiated by methane, toluene, and phenol utilizers were 1.5, 30, and 100 μg/L-hr, respectively. During the incubation period of 80 hours, TCE removal efficiencies were 26% and 96% with the presence of methane and toluene, respectively. However, it was 100% within 20 hours with the presence of phenol. For phenol utilizers, the initial TCE removal rates were about the same, when the phenol concentrations were 1.35, 2.7, and 4.5 mg/L. However, TCE removal was not proportional to the concentrations of phenol. TCE removal was hindered when the phenol concentration was higher than 4.5 mg/L because of the rapid depletion of dissolved oxygen. The presence of toluene also initiated cometabolic removal of TCE. The presence of toluene at 3 and 5 mg/L resulted in similar TCE removal. The initial TCE removal rate was about 95 μg/L-hr at toluene concentrations of 3 and 5 mg/L compared to 20 μg/L-hr at toluene concentration of 1 mg/L.

Sign in / Sign up

Export Citation Format

Share Document