Evaluation of an Aerobic Denitrifying Bacterium for Wastewater Treatment

2012 ◽  
Vol 621 ◽  
pp. 278-282
Author(s):  
De Yong Zhang ◽  
Xiu Ying Shen ◽  
Xiao Lu Xu ◽  
Yin Lu ◽  
Fei Lin Hao
Keyword(s):  
Wastewater Treatment ◽  
Comprehensive Evaluation ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Factors Affecting ◽  
Denitrifying Bacterium ◽  
Total Phosphorous ◽  
N Removal ◽  
Phosphorous Concentration ◽  
Treatment Application

An aerobic denitrifying bacterium isolated from sludge was evaluated for water treatment application. The denitrification reaction condition was optimized using orthogonal experiment as temperature 30°C,pH7.0 and shaking speed 250rpm. The highest denitrification rate observed at 24h in the optimization experiment was 94.8%. Temperature was confirmed to be the most significant one in the four factors affecting the denitrification efficiency. In a comprehensive evaluation experiment for printing-dying wastewater treatment, the bacterium showed a satisfying water purification effects with obvious decreasing of COD, total phosphorous concentration and nitrate. The highest NO3--N removal rate occurred on day 3, which reached 94.2%.

Study on Removal of NH4+-N by Zero-Valent Iron (ZVI or Fe0) in Advanced Coking Wastewater Treatment

2010 ◽  
Vol 160-162 ◽  
pp. 1647-1653
Author(s):  
Su Qin Li ◽  
Yun Fei Xiong ◽  
Xue Zhang ◽  
Ayijamali Kudureti
Keyword(s):  
Wastewater Treatment ◽  
Critical Parameter ◽  
Removal Rate ◽  
Zero Valent Iron ◽  
Chemical Agent ◽  
Coking Wastewater ◽  
Variable Parameters ◽  
N Concentration ◽  
N Removal ◽  
Initial Ph

In this study, the feasibility of a new chemical agent named zero-valent iron (ZVI or Fe0) was used to investigate for removal of NH4+-N from coking wastewater. Reaction pH, dose of Fe0, initial NH4+-N concentration and temperature were considered variable parameters. The pH was observed as the major critical parameter. The removal rate of NH4+-N decreased as the pH increased from 3 to 6 and then increased from pH 6 to pH 9. At pH of 8.0 about in coking wastewater, the NH4+-N removal might be depended on the types and quantity of corrosion products on the surface of Fe0. The removal rate of NH4+-N increased with increase of temperature in the studied range of 10–60°C. At an initial NH4+-N concentration of 134.17 mg/L, Fe0 concentration of 6 g/L, temperature of 60°C and initial pH of 8.0, the removal rate of NH4+-N increased to 54.94%. The dose of Fe0 is determined according to the nitrogen content in coking wastewater.

Extended statistical entropy analysis (eSEA) for improving the evaluation of Austrian wastewater treatment plants

2013 ◽  
Vol 67 (5) ◽  
pp. 1051-1057 ◽  
Author(s):  
A. Sobańtka ◽  
H. Rechberger
Keyword(s):  
Wastewater Treatment ◽  
Cost Efficiency ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Removal Rate ◽  
Entropy Analysis ◽  
Statistical Entropy ◽  
N Removal ◽  
Cost Efficient ◽  
Biological Treatment Process

Extended statistical entropy analysis (eSEA) is used to evaluate the nitrogen (N) budgets of 13 Austrian wastewater treatment plants (WWTPs). The eSEA results are then compared to the WWTPs specific N-removal rates. Among the five WWTPs that achieve a removal rate of 75% the eSEA detects significant differences in the N-performance. The main reason for this is that eSEA considers all N-species and seems to be more discriminating than the N-removal rate. Additionally, the energy consumption and the costs of the mechanical–biological treatment process are related to the N-performance according to the eSEA. The influence of the WWTP size on the energy- and cost-efficiency of the N-treatment is investigated. Results indicate that energy-efficiency does not necessarily coincide with cost-efficiency. It is shown that smaller WWTPs between 22,000 PE (population equivalents) and 50,000 PE can be operated as energy-efficiently as larger WWTPs between 100,000 and 1,000,000 PE. On average, the smaller plants operate less cost-efficiently than the large ones. This research offers a new method for the assessment of the N-performance of WWTPs, and suggests that small WWTPs are not necessarily less energy- and cost-efficient than large ones.

Treatment of Mariculture Wastewater Using Constructed Wetlands under Antibiotic Interference

2014 ◽  
Vol 522-524 ◽  
pp. 849-853 ◽  
Author(s):  
Qi Shuo Wang ◽  
Ji Guang Li ◽  
Chun Jun Wang ◽  
Xiu Ping Cai ◽  
Hui Sun ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Removal Rate ◽  
Drug Resistant ◽  
Vertical Flow ◽  
Toc Removal ◽  
N Removal ◽  
Wetland System ◽  
Aquaculture Wastewater ◽  
Upper Level

Wetland wastewater treatment commonly used in farming, but aquaculture wastewater often contains large amounts of antibiotics, making the wetland system there is uncertainty on the removal of contaminants. To this end, this paper four antibiotics (Ampicillin, Oxytetracycline, Bacitracin, Colistin sulfate) composite vertical flow constructed wetland wastewater treatment on the effects of mariculture. The results showed that for the next four kinds of antibiotics interfere IVCW with TOCNH3-NNO3--N removal rate decreased; But after some time, TE for TOC removal and CS for NO3--N removal was without interference. In addition, wetland microbial resistance to antibiotics will be gradually formed, the lower the formation of drug-resistant and high resistant faster than the upper level, and prolonged use of broad-spectrum antibiotics are more prone to tolerance.

scholarly journals Evaluation of influencing factors on the adaptability of ICD completion technology

2021 ◽  
Vol 261 ◽  
pp. 02071
Author(s):  
Guohui Zhang ◽  
Liangchuan Li ◽  
Rong Chen ◽  
Peng Wang ◽  
Guowen Zhang ◽  
...  
Keyword(s):  
Comprehensive Evaluation ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Horizontal Wells ◽  
Water Production ◽  
Water Control ◽  
Orthogonal Experiment Design ◽  
Factors Affecting ◽  
Well Completion ◽  
Main Index

After years of research and practice, ICD well completion technology has become a relatively mature completion technology, and has been successfully applied in hundreds of horizontal Wells abroad. However, due to many factors affecting ICD effect, mature evaluation methods have not been completely established. At present, the main index of ICD water control development effect is to balance inflow profile and inhibit water production, and the evaluation factors involve reservoir, process and equipment structure. This paper summarizes the factors influencing the effects of ICD, using orthogonal experiment design method to carry on the comprehensive evaluation, and puts forward the corresponding Suggestions

An Engineering Practice of Industrial Wastewater Treatment with Fe/Cu Bimetallic Process

2014 ◽  
Vol 694 ◽  
pp. 396-405
Author(s):  
Xia Liu ◽  
Hong Wu Wang ◽  
Jin Hong Fan ◽  
Lu Ming Ma ◽  
Jing Xu
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Removal Rate ◽  
Operating Cost ◽  
Treatment Plant ◽  
Engineering Practice ◽  
Pretreatment Method ◽  
Total Phosphorous ◽  
Pretreatment Technology

Fe/Cu bimetallic process was developed as a new industrial wastewater pretreatment method. It was difficult for an industrial park wastewater treatment plant in Shanghai to treat the wastewater with many refractory pollutants and match the improved discharge standards. The plant needed renovation and adopted Fe/Cu process as a core pretreatment technology. 60,000 tons of wastewater is treated in the plant every day and the average removal rate of COD, BOD, total phosphorous (TP) and color was 73%, 77%, 55% and 48% respectively before renovation. After renovation, the average removal rate of COD, BOD, total phosphorous (TP) and color was reached to 86%, 93%, 76% and 85%, respectively. The engineering practice shows that the removal rate of COD, color and TP in Fe/Cu tank reached 29.7%, 60% and 53.6%. The continuous operating data in two years shows that Fe/Cu process can effectively improve the biodegradability of wastewater and enhanced the subsequent biological treatment. The successful engineering practice indicts that the slag dropping quickly effectively avoid agglomeration and clogging of the Fe/Cu filler and the operating cost is very low.

Effect of Anode Size, Membrane and Membrane Size on Power Generation and Wastewater Treatment in Microbial Fuel Cells

2012 ◽  
Vol 164 ◽  
pp. 506-510
Author(s):  
Guang Yu Zhou ◽  
Yuichiro Yoshino ◽  
Takahiro Yamashita ◽  
Takahiro Sato ◽  
Yasunori Kawagoshi
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Removal Rate ◽  
Orthogonal Experiment ◽  
Coulombic Efficiency ◽  
Abiotic Factors ◽  
Anaerobic Sludge ◽  
Toc Removal ◽  
The Impact

Using wastewater as substrate, taking anaerobic sludge as inoculant, microbial fuel cells (MFCs) have emerged in recent years, which can generate electricity and accomplish wastewater treatment simultaneously. Based on the evaluation indexes of output voltage, coulombic efficiency, power density and TOC removal rate, three abiotic factors, anode size, membrane and membrane size, affecting MFC performance were investigated with an orthogonal experiment (L4 (23)). The results show that the impact order of factors through analyzing the value “R” was “anode size > membrane > membrane size”. The optimal set with these three factors for the performance of MFCs was big size anode, Naf-117 and big size membrane. Meanwhile, the high TOC removal rate (more than 90%) and high acetates consumed rate (100%) show the MFCs have strong ability of wastewater treatment. Cation exchange membrane Yumi-28 has compared ability of wastewater treatment and energy-production potential in MFC work.

Study on the Influence Factors of the Improved A2/O Process Used in Swine Wastewater Treatment

2011 ◽  
Vol 183-185 ◽  
pp. 778-782
Author(s):  
Ming Fen Niu ◽  
Zhi Yuan Liu ◽  
Zhuo Ping Li ◽  
Dong Xu Zhou
Keyword(s):  
Wastewater Treatment ◽  
Removal Rate ◽  
Nitrate Solution ◽  
Influence Factors ◽  
Swine Wastewater ◽  
Flow Mode ◽  
Reflux Ratio ◽  
Test Results ◽  
Smooth Flow ◽  
N Removal

An experiment of treating anaerobic fermented hogpen sewage by improved A2/O reactor was carried out to study the influence factors affect the pollution mater reducing rate during the course of combine domestication. After anaerobic fermented cultivation course of hogpen sewage by A2/O technics, thought the treatment system’s parameters included hydraulics reside time (HRT), deliquescent oxygen (DO), and reflux ration of nitrate solution (r) to study the system’s treatment effect. The experiment results indicated that the improved A2/O process starts with a smooth flow mode, the effluent COD, NH3-N removal were steady at about 90%, TN removal rate of up to 60% of available, TP removal rate of 85%, according to the test results, taking into account the energy consumption problem, the best conditions for the system: DO= 3 mg / L, HRT =24 h, nitration liquid reflux ratio 3.

PARAMETER OPTIMIZATION AND EXPERIMENTAL RESEARCH ON THE HAMMER MILL 锤片式粉碎机参数优化与试验研究

2020 ◽  
pp. 341-350
Author(s):  
Di Wang ◽  
Changbin He ◽  
Haiqing Tian ◽  
Liu Fei ◽  
Zhang Tao ◽  
...  
Keyword(s):  
Moisture Content ◽  
Orthogonal Experiment ◽  
Electricity Consumption ◽  
Spindle Speed ◽  
Hammer Mill ◽  
Factors Affecting ◽  
Evaluation Indexes ◽  
Grain Moisture ◽  
Validation Experiment ◽  
Corn Grain

Low productivity and high electricity consumption are considered problems of the hammer mill, which is widely used in current feed production. In this paper, the mechanical properties of corn grain ground by a hammer mill were analysed, and the key factors affecting the performance of the hammer mill were determined. The single-factor experiment and three-factor, three-level quadratic regression orthogonal experiment were carried out with the spindle speed, corn grain moisture content and number of hammers as experimental factors and the productivity and electricity consumption per ton as evaluation indexes. The results showed that the order of influence on the productivity was spindle speed > corn grain moisture content > number of hammers and that the order of influence on the electricity consumption per ton was corn grain moisture content > spindle speed > number of hammers. The parameters were optimized based on the response surface method with the following results: the spindle speed was 4306 r/min, the corn grain moisture content was 10%, and the number of hammers was 24. The validation experiment was carried out with the optimal parameters’ combination. The productivity and electricity consumption per ton were 988.12 kg/h and 5.37 kW·h/t, respectively, which were consistent with the predicted results of the model.

scholarly journals Assessment of Microplastics in a Municipal Wastewater Treatment Plant with Tertiary Treatment: Removal Efficiencies and Loading per Day into the Environment

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1339
Author(s):  
Javier Bayo ◽  
Sonia Olmos ◽  
Joaquín López-Castellanos
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Source Control ◽  
Municipal Wastewater Treatment ◽  
Tertiary Treatment ◽  
Stable Performance ◽  
Wastewater Samples

This study investigates the removal of microplastics from wastewater in an urban wastewater treatment plant located in Southeast Spain, including an oxidation ditch, rapid sand filtration, and ultraviolet disinfection. A total of 146.73 L of wastewater samples from influent and effluent were processed, following a density separation methodology, visual classification under a stereomicroscope, and FTIR analysis for polymer identification. Microplastics proved to be 72.41% of total microparticles collected, with a global removal rate of 64.26% after the tertiary treatment and within the average retention for European WWTPs. Three different shapes were identified: i.e., microfiber (79.65%), film (11.26%), and fragment (9.09%), without the identification of microbeads despite the proximity to a plastic compounding factory. Fibers were less efficiently removed (56.16%) than particulate microplastics (90.03%), suggesting that tertiary treatments clearly discriminate between forms, and reporting a daily emission of 1.6 × 107 microplastics to the environment. Year variability in microplastic burden was cushioned at the effluent, reporting a stable performance of the sewage plant. Eight different polymer families were identified, LDPE film being the most abundant form, with 10 different colors and sizes mainly between 1–2 mm. Future efforts should be dedicated to source control, plastic waste management, improvement of legislation, and specific microplastic-targeted treatment units, especially for microfiber removal.

scholarly journals Enhanced Wastewater Treatment by Immobilized Enzymes

2021 ◽  
Author(s):  
Jakub Zdarta ◽  
Katarzyna Jankowska ◽  
Karolina Bachosz ◽  
Oliwia Degórska ◽  
Karolina Kaźmierczak ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Process Optimization ◽  
Organic Pollutants ◽  
Large Scale ◽  
Removal Rate ◽  
Immobilized Enzymes ◽  
Future Research ◽  
Process Conditions ◽  
Removal Rates ◽  
Catalytic Cycles

Abstract Purpose of Review In the presented review, we have summarized recent achievements on the use of immobilized oxidoreductases for biodegradation of hazardous organic pollutants including mainly dyes, pharmaceuticals, phenols, and bisphenols. In order to facilitate process optimization and achievement of high removal rates, effect of various process conditions on biodegradation has been highlighted and discussed. Recent Findings Current reports clearly show that immobilized oxidoreductases are capable of efficient conversion of organic pollutants, usually reaching over 90% of removal rate. Further, immobilized enzymes showed great recyclability potential, allowing their reuse in numerous of catalytic cycles. Summary Collected data clearly indicates immobilized oxidoreductases as an efficient biocatalytic tools for removal of hazardous phenolic compounds, making them a promising option for future water purification. Data shows, however, that both immobilization and biodegradation conditions affect conversion efficiency; therefore, process optimization is required to achieve high removal rates. Nevertheless, we have demonstrated future trends and highlighted several issues that have to be solved in the near-future research, to facilitate large-scale application of the immobilized oxidoreductases in wastewater treatment.

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