Research of the Application of Denitrifying Phosphate Removal Bacteria in the A2/O Process

2013 ◽  
Vol 448-453 ◽  
pp. 1211-1216
Author(s):  
Meng Zhao ◽  
Shuai Bing ◽  
Xue Song Li ◽  
Meng Ru Xuan
Keyword(s):  
Phosphorus Removal ◽  
High Efficiency ◽  
Influence Factors ◽  
Research Field ◽  
Phosphate Removal ◽  
Treatment Technology ◽  
Denitrifying Phosphorus Removal ◽  
Process Stage ◽  
Removal Technology ◽  
New Type

As a new type and high efficiency and low energy consumption one in biological denitrification and phosphorus removal technology, denitrifying phosphorus removal has become a hot topic in the research field of the water treatment technology. In this technology, denitrifying phosphate removal bacteria (DPBs) plays an important role. In each process stage of an A2/O process, denitrifying phosphorus removal bacteria (DPBs) plays different function. Combining with theory of the A2/O process, the function and main influence factors of denitrifying phosphorus removal bacteria (DPBs) are studied, and the prospect about DPBs is proposed.

The Nanofiltration Technology of Metoprolol in the Water Environment

2014 ◽  
Vol 955-959 ◽  
pp. 1013-1019
Author(s):  
Xin Miao Wang ◽  
Hai Yan Yang
Keyword(s):  
Ionic Strength ◽  
Removal Rate ◽  
Water Environment ◽  
Influence Factors ◽  
Advanced Treatment ◽  
Organic Micropollutants ◽  
Treatment Technology ◽  
Water And Wastewater Treatment ◽  
New Type ◽  
Water And Wastewater

Metoprolol (MET) is a common kind of Pharmaceuticals and personal care products (PPCPs), which belongs to a new type of organic micropollutants. And conventional water and wastewater treatment technology cannot remove the MET effectively, so it is necessary to adopt nanofiltration technology for advanced treatment. The influence factors on removal of Metoprolol (MET) in water by nanofiltration are mainly investigated in the study. According to the results, the removal rate of MET by nanofiltration all can reach more than 99% with the initial concentration increasing. Then the removal rate of MET by nanofiltration at different pressure values, pH, salt ionic strength conditions are also studied. The results have shown that the removal rate is increasing from 90.0% to about 99.0% while pressure goes up. When pH=5, the removal rate of MET by nanofiltration is slightly increasing. And the removal rate is decreasing from more than 98.0% to more than 92.0% with salt ionic strength increasing.

Research Progress of Phosphorus Removal in Enhanced Coagulation

2012 ◽  
Vol 518-523 ◽  
pp. 1825-1830
Author(s):  
Chao Chun Tang ◽  
Peng Hui Shao ◽  
Mei Peng Jian ◽  
He Gen Yu
Keyword(s):  
Phosphorus Removal ◽  
Lower Cost ◽  
Research Progress ◽  
Enhanced Coagulation ◽  
The Core ◽  
Removal Technology ◽  
New Type

Phosphorus is one of the prime cause of eutrophication,the research of phosphorus removal technology catches the most attention all the time.This paper is focusing on introducing the application and development of the solutions for the phosphorus removal, such as new type of coagulant, new coagulation craft and new flocculation reactor.It points out the core problems in restricting the development of the methods of enhanced coagulation in phosphorus removal ，and gives a clear direction for the research of the methods of enhanced coagulation in phosphorus removal.The enhanced coagulation technology at lower cost and less energy is worth deeply researching.

The Influence Factors in Denitrifying Phosphorus Removal

2013 ◽  
Vol 401-403 ◽  
pp. 2084-2087
Author(s):  
Ming Fen Niu ◽  
Si Li ◽  
Hong Jing Jiao ◽  
Jian Wei ◽  
Yuan Yang Sun ◽  
...  
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Influence Factors ◽  
Volume Ratio ◽  
Wastewater Sludge ◽  
Practical Application ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Denitrifying Phosphorus Removal

Denitrifying phosphorus removal can be achieved with the same matrix simultaneous nitrogen and phosphorus removal，is a hot topic of abroad study biological wastewater treatment，This is discussed the Influence factors of anoxic tank NO3- load, dissolved oxygen and the volume ratio of aerobic tank and anoxic tank, pH value of wastewater, sludge retention time (SRT), hydraulic retention time (HRT), mixed liquor suspended solids (MLSS) and temperature on denitrifying phosphorus removal, for denitrifying phosphorus removal process simulation, experimental research and practical application provides a reference and basis.

scholarly journals Denitrification kinetics indicates nitrous oxide uptake is unaffected by electron competition in Accumulibacter

2020 ◽  
Author(s):  
Roy Samarpita ◽  
Pradhan Nirakar ◽  
NG How Yong ◽  
Wuertz Stefan
Keyword(s):  
Nitrous Oxide ◽  
Electron Acceptor ◽  
Phosphorus Removal ◽  
Metabolic Model ◽  
Electron Acceptors ◽  
Treatment Technology ◽  
Denitrifying Phosphorus Removal ◽  
Terminal Electron Acceptor ◽  
Efficient Treatment ◽  
Denitrification Kinetics

ABSTRACTDenitrifying phosphorus removal is a cost and energy efficient treatment technology that relies on polyphosphate accumulating organisms (DPAOs) utilizing nitrate or nitrite as terminal electron acceptor. Denitrification is a multistep process and many organisms do not possess the complete pathway, leading to the accumulation of intermediates such as nitrous oxide (N2O), a potent greenhouse gas and ozone depleting substance. Candidatus Accumulibacter organisms are prevalent in denitrifying phosphorus removal processes and, according to genomic analyses, appear to vary in their denitrification abilities based on their lineage. Yet, denitrification kinetics and nitrous oxide accumulation by Accumulibacter after long-term exposure to either nitrate or nitrite as electron acceptor have never been compared. We investigated the preferential use of the nitrogen oxides involved in denitrification and nitrous oxide accumulation in two enrichments of Accumulibacter and a competitor – the glycogen accumulating organism Candidatus Competibacter. A metabolic model was modified to predict phosphorus removal and denitrification rates when nitrate, nitrite or N2O were added as electron acceptors in different combinations. Unlike previous studies, no N2O accumulation was observed for Accumulibacter in the presence of multiple electron acceptors. Electron competition did not affect denitrification kinetics or N2O accumulation in Accumulibacter or Competibacter. Despite the presence of sufficient internal storage polymers (polyhydroxyalkanoates, or PHA) as energy source for each denitrification step, the extent of denitrification observed was dependent on the dominant organism in the enrichment. Accumulibacter showed complete denitrification and N2O utilization, whereas for Competibacter denitrification was limited to reduction of nitrate to nitrite. These findings indicate that DPAOs can contribute to lowering N2O emissions in the presence of multiple electron acceptors under partial nitritation conditions.

Effects of Aeration on Nitrogen and Phosphate Removal with A2O Process

2012 ◽  
Vol 622-623 ◽  
pp. 1738-1741 ◽  
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
High Efficiency ◽  
Low Cost ◽  
Significant Decline ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
System A ◽  
Nitrogen And Phosphate Removal

A2O process is shortened form Anaerobic-Anoxic-Aerobic process, which can achieve carbon, nitrogen and phosphate removal, is widely used for its low cost and high efficiency. The Experiment using a 52.15 L anaerobic-anoxic- aerobic (A2O) reactor with simulate synthetic wastewater, by adjusting the aeration of Aerobic units, observing the performance of nitrogen and phosphorus removal under different dissolved oxygen(DO). The result of the whole operation show that the system can not keep a high TN removal efficiency under high aeration, and the low aeration made the system a significant decline in nitrogen and phosphorus removal.

scholarly journals Research on lateral flow treatment technology to enhance phosphorus removal of AAO process

2018 ◽  
Vol 53 ◽  
pp. 04029
Author(s):  
Shoubin Zhang ◽  
Yuze Li ◽  
Wenhai Jiao ◽  
Liping Qiu ◽  
Jingxiu Zhong ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Future Development ◽  
Phosphorus Removal ◽  
High Efficiency ◽  
Effective Means ◽  
Lateral Flow ◽  
Phosphorus Recovery ◽  
Treatment Technology ◽  
Efficient Process ◽  
Flow Treatment

Removing efficiently and recycling of phosphorus in the wastewater, was not only an effective means to prevent and cure the eutrophication of water, but also an important way to realize the recovery of phosphorus resources. In the traditional AAO process, the discharge of phosphorus rich sludge could reach the goal of phosphorus removal. However, the treatment of phosphorus rich sludge was difficult and could not achieve the goal of phosphorus recovery. The lateral flow phosphorus removal treatment technology, building on the side of the traditional AAO system, was an efficient process to realize high efficiency phosphorus removal and phosphorus resources recovery by forming phosphate precipitation or crystallization. In this paper, by summarizing and analyzing the existing technology of lateral flow phosphorus recovery wastewater treatment based on AAO mainstream technology, the future development of this technology was also prospected.

scholarly journals Preparation of a New Iron-Carbon-Loaded Constructed Wetland Substrate and Enhanced Phosphorus Removal Performance

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4739
Author(s):  
Jie Zhao ◽  
Jingqing Gao ◽  
Junzhao Liu
Keyword(s):  
Activated Carbon ◽  
Phosphorus Removal ◽  
High Efficiency ◽  
Energy Dispersive Spectrometer ◽  
Carbon Particle ◽  
Carbon Substrate ◽  
Synthesis Conditions ◽  
Phosphorus Containing ◽  
New Type

Iron-carbon substrates have attracted extensive attention in water treatment due to their excellent processing ability. The traditional iron-carbon substrate suffers from poor removal effects, separation of the cathode and anode, hardening, secondary pollution, etc. In this study, a new type of iron-carbon-loaded substrate (NICLS) was developed to solve the problems of traditional micro-electrolytic substrates. Through experimental research, a preparation method for the NICLS with Fe and C as the core, zeolite as the skeleton, and water-based polyurethane as the binder was proposed. The performance of the NICLS in phosphorus-containing wastewater was analyzed. The results are as follows: The optimal synthesis conditions of the NICLS are 1 g hydroxycellulose, wood activated carbon as the cathode, an activated carbon particle size of 200-60 mesh, and an Fe/C ratio of 1:1. Acidic conditions can promote the degradation of phosphorus by the NICLS. Through the characterization of the NICLS (scanning electron microscope (SEM), X-ray diffractometer (XRD), and energy-dispersive spectrometer (EDS), etc.), it is concluded that the mechanism of the NICLS phosphorus removal is a chemical reaction produced by micro-electrolysis. Using the NICLS to treat phosphorus-containing wastewater has the advantages of high efficiency and durability. Therefore, it can be considered that the NICLS is a promising material to remove phosphorus.

scholarly journals An Analysis of Population Return from the Perspective of Rural Urbanization

2017 ◽  
Vol 2 (3) ◽  
pp. 309 ◽  
Author(s):  
Zhenpeng Duan ◽  
Xinxin Xu
Keyword(s):  
Rural Area ◽  
Influence Factors ◽  
Research Field ◽  
Main Body ◽  
High Quality ◽  
Rural Urbanization ◽  
Significant Research ◽  
New Type ◽  
Developmental Point

<em>Coming up with the idea of new type of urbanization drives great changes of rural area. However, there hasn’t been high quality of rural urbanization compared with cities, which is becoming a weakness during the construction of urbanization. Therefore, it is very urgent to accelerate the construction of rural urbanization. Meanwhile, how to promote the development of rural area turns into a significant research field. Thus, as the main body of rural practical activities, human being becomes the developmental point of rural urbanization. The author puts forward the practical and theoretical policies via analyzing the influence factors “Push &amp; Pull” about the reflux of rural population to promote the development of rural area and achieve the goal of rural urbanization, with supplementing the rational escalation of “Boosting” in cities and increasing the “Homesickness” of outflowing peasants.</em>

Polymer-Modified Cement Waterproofing Coating and Cementitious Capillary Crystalline Waterproofing Materials: Mechanism and Applications

2017 ◽  
Vol 726 ◽  
pp. 527-531 ◽  
Author(s):  
Yuan Yu ◽  
Tao Sun
Keyword(s):  
Building Materials ◽  
High Efficiency ◽  
Construction Material ◽  
Influence Factors ◽  
Single Layer ◽  
Economic Benefits ◽  
Real Estate Industry ◽  
New Type ◽  
Quality Guarantee ◽  
Construction Works

As the Integrant Construction Material for Infrastructure Construction and Real Estate Industry, Building Waterproof Materials is a Key Part of the Construction Quality Guarantee. it Plays an Important Role in Saving Energy, Reducing Consumption and Environmental Protection. it Lays the Foundation for the Realization of the Cleaning Production and High Efficiency for Economical Production. Currently, the Direction of Waterproof Construction is from Multi-Layer to Single Layer, from Heat to Cold Construction. there are many Different Kinds of Waterproof Materials on Building Materials Market. when the Waterproof Materials Need to Be Used for the Project, we should Deal with Problems Case by Case in Order to Be Able to Select the Waterproof Coating Suitable for the Characteristics of the Project. Attention Need to Be Paid for the Differences of the Constituents, the Physical Mechanical Properties and Characteristics, and Construction Points and Matters during Construction Works Polymer-Modified Cement Waterproofing Coating and Cementitious Capillary Crystalline Waterproofing Materials are Reviewed in the Present Study. Waterproof Mechanism and Influence Factors of its Application Discussed. as a New Type of Waterproof Materials, its Unique Advantage and Price Decline, it has been Widely Used in Industrial and Civil Buildings, and the Remarkable Economic Benefits and Social Benefits has been Achieved in Past few Years.

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