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.

scholarly journals Scaling up Microbial Fuel Cells for Treating Swine Wastewater

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1803 ◽  
Author(s):  
Yuko Goto ◽  
Naoko Yoshida
Keyword(s):  
Organic Matter ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Swine Wastewater ◽  
Flow Mode ◽  
Carbon Cloth ◽  
Simultaneous Generation

Conventional aerobic treatment of swine wastewater, which generally contains 4500–8200 mg L−1 of organic matter, is energy-consuming. The aim of this study was to assess the application of scaled-up microbial fuel cells (MFCs) with different capacities (i.e., 1.5 L, 12 L, and 100 L) for removing organic matter from swine wastewater. The MFCs were single-chambered, consisting of an anode of microbially reduced graphene oxide (rGO) and an air-cathode of platinum-coated carbon cloth. The MFCs were polarized via an external resistance of 3–10 Ω for 40 days for the 1.5 L-MFC and 120 days for the 12L- and 100 L-MFC. The MFCs were operated in continuous flow mode (hydraulic retention time: 3–5 days). The 100 L-MFC achieved an average chemical oxygen demand (COD) removal efficiency of 52%, which corresponded to a COD removal rate of 530 mg L−1 d−1. Moreover, the 100 L-MFC showed an average and maximum electricity generation of 0.6 and 2.2 Wh m−3, respectively. Our findings suggest that MFCs can effectively be used for swine wastewater treatment coupled with the simultaneous generation of electricity.

scholarly journals Swine wastewater treatment by combined process of iron carbon microelectrolysis-physical adsorption-microalgae cultivation

2021 ◽  
Author(s):  
Wenjin Zhang ◽  
Rongbin Xia ◽  
Hao Wang ◽  
Shihua Pu ◽  
Dongmei Jiang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Physical Adsorption ◽  
Oxygen Demand ◽  
Dry Weight ◽  
Swine Wastewater ◽  
Combined Treatments ◽  
Microalgae Cultivation ◽  
Integrated Method ◽  
N Removal ◽  
Maximum Cell

Abstract Combined treatments were designed based on iron-carbon micro-electrolysis treatment (ICME), physical adsorption (PA) with zeolite (Z) or vermiculite (V) and microalgae cultivation (MC, C. vulgaris) for removing pollutants from swine wastewater (SW), herein are ICME + MC (IM), ICME + Z + MC (IZM) and ICME + V + MC (IVM). Results showed that the minimum total nitrogen (TN) of 43.66 mg L−1, NH4+-N of 1.33 mg−1 and total phosphorus (TP) of 0.14 mg−1 were obtained by IVM, while the minimum chemical oxygen demand (COD) was 105 mg−1 via IM. During the process of combined treatments, ICME contributed most to the removal of TN (84.52% by IZM), TP (97.78% by IVM and IZM) and COD (62.44% by IVM), and maximum NH4+-N removal (55.64%) was obtained by MC procedure in IM process. Vermiculite performed better than zeolite during all the combined treatments. Besides, the maximum cell dry weight (CDW, 0.74 g−1) of C. vulgaris was obtained by IM on day 13. The results provide an efficient integrated method for swine wastewater treatment.

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.

Effect on Bed Material Heights to the Performance of ZCBAF in the Treatment of Micro-Polluted Raw Water

2012 ◽  
Vol 209-211 ◽  
pp. 2053-2057
Author(s):  
Jin Xiang Liu ◽  
Shui Bo Xie ◽  
Chun Ning Cheng ◽  
Jin Sheng Lou ◽  
Shi You Li
Keyword(s):  
Removal Efficiency ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Test Results ◽  
Raw Water ◽  
Hydraulic Loading ◽  
N Removal ◽  
The Media ◽  
Aerated Filter ◽  
Bed Material

The effect of bed material heights on treatment performance of pollutants from micro-polluted raw Water was studied in zeolite - Ceramics biological aerated filter(ZCBAF) technology. The test results showed the removal rate of CODMn, NH4+-N and UV254 will improve with the increase of media height, most of CODMn and UV254 were removed within the first 440mm , when the media height over 440mm, the effect of increase height is inconspicuous removal, and ammonia-nitrogen removal has evident improvement during 220-440mm. At the media height of 20mm, 40mm and 60mm in ZCBAF respectively, the removal efficiency of CODMn is 18.05%，31.6% and 38.62% respectively, NH4+-N removal efficiency is 29.78%,81.28% and 93.02% respectively , and UV254 removal efficiency is 7.81%，10.11% and 11.26% respectively under the air/water ratio of 1:1 and the hydraulic loading of 1.2m3/(m2.h). Removal rate of CODMn was decreased with the increase of hydraulic loading, and removal effect of NH4+-N and UV254 had not big influence.

scholarly journals Nitrite Accumulation at Low Copper Concentration in a Submerged Partial Bionitrification Reactor

2021 ◽  
Vol 43 (6) ◽  
pp. 419-427
Author(s):  
Sukru Aslan ◽  
Burhanettin Gurbuz
Keyword(s):  
Loading Rate ◽  
Accumulation Rate ◽  
Removal Rate ◽  
Synthetic Wastewater ◽  
Flow Mode ◽  
Nitrite Accumulation ◽  
N Accumulation ◽  
Operational Conditions ◽  
Support Materials ◽  
N Removal

Objectives : Effects of various Cu2+ concentrations in the synthetic wastewater on nitrite accumulation was investigated in a submerged partial biofilter reactor (SPBNR).Methods : Experiments were carried out at the constant operational conditions (T=35℃; pH=9.0 and DO=2.0 mg O2/L) by varying the concentrations between 5-50 mg Cu2+/L. The SPBNR, which was operated in an upward flow mode, set-up consisted of a cylindrical stainless steel. The support materials filling ratio was about 23% of the total reactor volume. The SPBNR was inoculated with microorganism drawn from a batch experimental biological reactor operated about one month by using the synthetic wastewater composition.Results and Discussion : Before exposure to Cu2+, the highest loading rate of 1.3 g NH4-N/(m2.day) was determined under the operational conditions. Addition of 5 µg Cu2+/L into the waters promoted the activity of organisms and the loading rate achieved to 1.6 g NH4-N/(m2.day). At the control operational condition, the ratio of NO2-N/NOx-N was determined as 0.74, while the ratio increased to 0.78 at the Cu2+ concentration of 5 µg/L.Conclusions : Results indicated that the ammonium oxidizing bacteria (AOB) is more stimulated than the nitrite oxidizing bacteria (NOB) at the concentration of 5 µg Cu2+/L. However, approximately equal NH4-N removal rate (ANRR) and NO2-N accumulation rate (NiAR) losses indicated that the AOB and NOB are approximately equally effected at the inlet concentrations of 35 and 50 µg Cu2+/L.

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%.

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.

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