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.

scholarly journals A Cyanobacteria-Based Biofilm System for Advanced Brewery Wastewater Treatment

2020 ◽  
Vol 11 (1) ◽  
pp. 174
Author(s):  
Konstantinos P. Papadopoulos ◽  
Christina N. Economou ◽  
Athanasia G. Tekerlekopoulou ◽  
Dimitris V. Vayenas
Keyword(s):  
Wastewater Treatment ◽  
Biomass Production ◽  
Low Cost ◽  
Oxygen Demand ◽  
Dry Weight ◽  
Surface Hydrophobicity ◽  
Reactor Performance ◽  
Brewery Wastewater ◽  
Kjeldahl Nitrogen ◽  
Supporting Materials

Algal/cyanobacterial biofilm photobioreactors provide an alternative technology to conventional photosynthetic systems for wastewater treatment based on high biomass production and easy biomass harvesting at low cost. This study introduces a novel cyanobacteria-based biofilm photobioreactor and assesses its performance in post-treatment of brewery wastewater and biomass production. Two different supporting materials (glass/polyurethane) were tested to investigate the effect of surface hydrophobicity on biomass attachment and overall reactor performance. The reactor exhibited high removal efficiency (over 65%) of the wastewater’s pollutants (chemical oxygen demand, nitrate, nitrite, ammonium, orthophosphate, and total Kjeldahl nitrogen), while biomass per reactor surface reached 13.1 and 12.8 g·m−2 corresponding to 406 and 392 mg·L−1 for glass and polyurethane, respectively, after 15 days of cultivation. The hydrophilic glass surface favored initial biomass adhesion, although eventually both materials yielded complete biomass attachment, highlighting that cell-to-cell interactions are the dominant adhesion mechanism in mature biofilms. It was also found that the biofilm accumulated up to 61% of its dry weight in carbohydrates at the end of cultivation, thus making the produced biomass a suitable feedstock for bioethanol production.

Natural wastewater treatment in Hungary

2001 ◽  
Vol 44 (11-12) ◽  
pp. 331-338 ◽  
Author(s):  
A. Szabó ◽  
A. Osztoics ◽  
F. Szilágyi
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Suspended Solid ◽  
Ammonium Nitrogen ◽  
Quality Parameters ◽  
Pollutant Removal ◽  
N Removal ◽  
Natural Treatment ◽  
Poplar Plantations

Over the last few decades more and more natural wastewater treatment systems have been built in Hungary. The present study is the first step in creating a broad database on the water quality parameters and on the pollutant removal efficiency of these systems. The investigation included 78 plants out of which we analysed 16 systems in detail. Four types of natural methods are evaluated: wetlands, ponds, bio-mechanical combined oxidation (BMKO) systems, and poplar plantations. Pond systems are efficient in ammonium-nitrogen (NH4-N) removal, reducing it with 83% (41-88%). Their chemical oxygen demand (CODCr) removal capacity is only 55% (37-81%). The only BMKO system that could be evaluated performs high CODCr (77%) and total suspended solid (TSS) (89%) removal. Removal of NH4-N and total nitrogen (TN) declines during the years of operation giving an average value of 39% and 49%, respectively. The system is not efficient in phosphorus removal (13%). In wetlands the 71% CODCr (53-96%), and 57% TSS (33-91%) removal provides satisfactory effluent quality most of the time. Wetlands performed low nutrient removal, i.e., 17% (-21-46%) for TN and 26% (-20-92%) for phosphorus. Poplar plantations are very effective in pollutant removal. Even the average removal of each nutrient type is above 75%. Several problems have occurred in the operation of natural treatment systems. However, if carefully planned and constructed, and the required maintenance work is done properly, they can be possible alternatives for wastewater treatment.

Comparative studies on the differently operated trains of the North-Budapest Wastewater Treatment Plant

2012 ◽  
Vol 65 (10) ◽  
pp. 1801-1808 ◽  
Author(s):  
A. Jobbágy ◽  
Gy. Palkó ◽  
T. Weinpel ◽  
M. Makó
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Analytical Data ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
The North ◽  
N Removal ◽  
Design Values ◽  
Part Time ◽  
Aeration Process

In order to reduce the pollution load of the Danube, the North-Budapest Wastewater Treatment Plant has been upgraded to enhanced nitrogen removal by establishing a new activated sludge treatment line and modifying the existing unit for nitrification and denitrification. As both the influent flow rate and the influent chemical oxygen demand (COD), biological oxygen demand (BOD5) and total suspended solids (TSS) concentration levels remained far below the design values, setting one fourth of the reactor volume out of operation in the Old Line, and operating the nitrification reactor of the New Line with part-time aeration proved to be possible. Analytical data as well as simulation studies supported the advantage of the intermittent-aeration process in efficient N-removal. However, the lengths of the aerated periods have to be increased with decreasing temperature, and thereby effluent total nitrogen (TN) concentration can increase due to decreasing denitrification efficiency. Potential occurrence of low-dissolved oxygen (DO) bulking should be hindered through applying an efficient anoxic selector system.

scholarly journals Potential of Microalgae Cultivation in Dairy Wastewater as a Step in Low-Cost Biofuel Production

2018 ◽  
Vol 24 (4) ◽  
pp. 58
Author(s):  
Basma Abbas Abdulmajeed ◽  
Arwa Raad Ibrahim
Keyword(s):  
Wastewater Treatment ◽  
Renewable Energy ◽  
Chemical Oxygen Demand ◽  
Low Cost ◽  
Oxygen Demand ◽  
Dairy Wastewater ◽  
Biofuel Production ◽  
Microalgae Cultivation ◽  
Chlorella Sp

The present study addresses adopting the organic and nutritious materials in dairy wastewater as media for cultivation of microalgae, which represent an important source of renewable energy. This study was carried out through cultivation of three types of microalgae; Chlorella sp., Synechococcus, and Anabaena. The results shows the success the cultivation of the Synechococcus and  Chlorella Sp, while the Anabaena microalgae were in low-growth level. The highest growth was in the Synechococcus farm, followed by Chlorella and Anabaena. However, the growth of Synechococcus required 10 days to achieve this increase that represents a negative indicator of the adoption of this type of microalgae in this media to meet the desired aims. While Chlorella needs less than two days to start growing. Moreover, the data obtained from the experiment show that removal of chemical oxygen demand in Chlorella cultures was (72%) more than that obtained from cultivation of other microalgae. Thus this microalgae is more efficient in wastewater treatment than other types.  

scholarly journals Swine wastewater treatment using an anaerobic baffled (ARB) and a UASB reactor system

2017 ◽  
Vol 38 (6) ◽  
pp. 3705
Author(s):  
Luciano Dos Santos Rodrigues ◽  
Ana Cristina Araujo Pinto ◽  
Joyce Da Cruz Ferraz Dutra ◽  
Renata Rodrigues Sampaio ◽  
Stella Rubim de Sousa ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Upflow Anaerobic Sludge Blanket ◽  
Swine Wastewater ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Promising Alternative ◽  
The Mean ◽  
Anaerobic Sludge Blanket

The purpose of this study was to assess the swine wastewater treatment system, consisting of the anaerobic baffled reactor (ABR), followed by the upflow anaerobic sludge blanket (UASB) reactor at full scale. The system was monitored by analyzing samples collected in the influent and effluent of ABR and UASB. The following parameters were analyzed: temperature, pH, total suspended solids (TSS), volatile suspended solids (VSS), biochemical oxygen demand (BOD), and chemical oxygen demand (COD). Averages of total removal of COD and BOD were 96.7 and 98.4%, respectively. The mean concentrations of COD, BOD, TSS, and VSS at the final effluent were 611, 124, 138, and 134 mg L-1, respectively. The mean volumetric organic loadings (VOL) at the ABR and UASB were 10.29 and 0.99 kg COD m-1d-1. Therefore, the ABR-UASB system was found to be a promising alternative for the swine wastewater treatment.

Removal of ZnO nanoparticles in simulated wastewater treatment processes and its effects on COD and NH4+-N reduction

2013 ◽  
Vol 67 (2) ◽  
pp. 254-260 ◽  
Author(s):  
Linlin Hou ◽  
Jing Xia ◽  
Kaiyang Li ◽  
Jian Chen ◽  
Xiaolei Wu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Zno Nanoparticles ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Engineered Nanoparticles ◽  
Zno Nps ◽  
Treatment Processes ◽  
N Removal ◽  
Simulated Wastewater ◽  
High Concentrations

For many engineered nanoparticles, the primary pathway of release into the environment is via sewage and industrial wastewater discharges. In this work, the removal of uncoated ZnO nanoparticles (ZnO NPs) during simulated wastewater treatment processes and its impact on treatment performance were examined. Simulated primary clarification removed the majority (about 70%) of the dosed ZnO NPs. During simulated sequencing batch reactor (SBR) processes, ZnO NPs were completely removed in each cycle throughout the 11-day experimental duration (two cycles per day). Continuous input of ZnO NPs into the wastewater (at concentrations up to 5 mg L−1) did not reduce chemical oxygen demand (COD) removal. NH4+-N removal was reduced at a dosing concentration of 5 mg L−1 ZnO NPs per cycle. Inhibition of respiration of nitrifying microorganisms by ZnO NPs corroborated the reduction of NH4+-N removal. These results indicate that if the wastewater is treated, the release of ZnO NPs into receiving water bodies would be minimal and ZnO NPs would mainly accumulate in biosolids. Uncoated ZnO NPs in wastewater at very high concentrations may have some adverse effects on activated sludge process.

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.

Microplastic contamination in a conventional wastewater treatment plant in Thailand

2021 ◽  
pp. 0734242X2098205
Author(s):  
Katekanya Tadsuwan ◽  
Sandhya Babel
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Environmental Concern ◽  
Liquid Fraction ◽  
Treatment Plant ◽  
Dry Weight ◽  
Plastic Waste ◽  
Sludge Sample ◽  
Global Environmental ◽  
Urban Wastewater Treatment

Plastic waste has become a global environmental concern. One type of plastic waste is microplastics (MPs), which can spread easily in the environment. Wastewater effluent is one of the land-based sources of MPs. This study investigates the amount of microplastic (MP) pollution in an urban wastewater treatment plant (WWTP) in Thailand. Water samples were collected and examined to find the types, morphology and sources of MPs. Wastewater was filtered through a set of sieves ranging from 5 mm to 0.05 mm. Sludge samples were also collected to find the potential risk from the application of dried sewage sludge. Fourier-transform infrared spectroscopy (FTIR) was used to confirm the types of MPs. The amount of MPs in the influent was 26.6 ± 11.8 MPs/L. More than one-third of MP particles were removed after a grit trap, followed by 14.24% removal in the secondary treatment. If the peak flow rate of the WWTP is reached, 2.32 × 109 MP particles can be released daily. The amount of MPs in a sludge sample was 8.12 ± 0.28 × 103 particles/kg dry weight. Dry sludge is one of the potential sources of MP contamination in agricultural soil. Most MPs in the liquid fraction and sludge sample were fibres. Results from FTIR analysis showed that the major types of MPs in the WWTP were polyester fibres, followed by polypropylene, polyethylene, silicone polymer and polystyrene. This finding indicates that a conventional WWTP may act as a path by which MPs enter the environment.

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