scholarly journals Bionic-inspired Construction of Zn(4,4'-dipy)(OAc)2/Bacterial Cellulose Composite Membrane for Efficient Separation Synergistically Adsorption of Nitrogen and Phosphorus

2021 ◽  
Author(s):  
Xudong Zheng ◽  
Wen Sun ◽  
Ning Wei ◽  
Tingting Bian ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Bacterial Cellulose ◽  
Total Phosphorus ◽  
Composite Membrane ◽  
Binary Solution ◽  
Chemical Properties ◽  
Ammonia Nitrogen ◽  
Cellulose Membrane ◽  
Nitrogen And Phosphorus ◽  
Cellulose Composite

Abstract Phosphorus and nitrogen flow to water leads to eutrophication and depletion of reserves. Bionic-inspired tannin modification is proposed for preparing a tannin-modified La-Zn(4,4'-dipy)(OAc)2/bacterial cellulose composite membrane for simultaneous adsorption of total phosphorus and ammonia nitrogen in water. Its physical and chemical properties were characterized by XRD, SEM, FT-IR, TGA and other characterization. La-Zn(4,4'-dipy)(OAc)2 nanomaterial achieved effective adhesion on the tannin-modified bacterial cellulose membrane. Adsorption experiments showed that the composite membrane can both adsorb total phosphorus and ammonia nitrogen, and adsorption capacity of ammonia nitrogen is better than that of total phosphorus. The maximum adsorption capacities of ammonia nitrogen and total phosphorus are 482.35 mg/g and 374.71 mg/g. In the binary solution, the adsorption capacity of the composite membrane to ammonia nitrogen and total phosphorus decreased, but the adsorption capacity to phosphorus decreased slightly. Results of adsorption experiments showed that the adsorption process of nitrogen and phosphorus by the composite membrane belongs to single-layer adsorption, and the calculation results of the kinetic equation are in accordance with the quasi-second-order, and the adsorption equilibrium of the composite membrane was reached within 360 min. In short, the composite membrane has a better adsorption and separation effect both on ammonia nitrogen and total phosphorus.

Mechanism Analysis and Experimental Research on the Interception of Nitrogen and Phosphorus Pollutants by Gullies in Northern China

2011 ◽  
Vol 250-253 ◽  
pp. 3392-3396
Author(s):  
Yu Jia Song ◽  
Hui Qing Liu
Keyword(s):  
Total Phosphorus ◽  
Nitrate Nitrogen ◽  
Northern China ◽  
Careful Analysis ◽  
Ammonia Nitrogen ◽  
Mechanism Analysis ◽  
Nitrogen And Phosphorus ◽  
Urban Sewage ◽  
Control Section ◽  
Nitrogen Pollutants

The discharge of urban sewage and agricultural non-point source pollutants is the main reason causing eutrophication in gullies in most cities of northern China. Based on a careful analysis on the ecological structure and ecological characteristics of a gully, this article preliminarily studies the interception and degradation mechanisms of nitrogen pollutants by the gully. Meanwhile, to take gullies in Changchun as the object of the study, this article carries out an experiment on the interception effect of nitrogen pollutants by gullies. This experiment respectively establishes a control section in the upper and lower reaches of a gully, and takes water samples four times in each section from May to August to determine total nitrogen, total phosphorus, nitrate nitrogen, ammonia nitrogen and salinity. The result shows: the gully plays some role in the interception of pollutants; total phosphorus accounts for the largest interception in pollutants in the experimented gully section, with the relative interception rate of 27.46%, followed by ammonia nitrogen, with the interception rate of 21.80%, which is the result of the combined effects of aquatic plants, microorganisms and sediment in the gully.

scholarly journals Biofabrication of a novel bacteria/bacterial cellulose composite for improved adsorption capacity

2019 ◽  
Vol 125 ◽  
pp. 105560 ◽  
Author(s):  
Yizao Wan ◽  
Jie Wang ◽  
Miguel Gama ◽  
Ruisong Guo ◽  
Quanchao Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Bacterial Cellulose ◽  
Novel Bacteria ◽  
Cellulose Composite

scholarly journals Badania modelowe skuteczności oczyszczania ścieków w piasku średnim z warstwą wspomagającą z hydro-antracytu

2019 ◽  
Vol 28 (2) ◽  
pp. 257-267
Author(s):  
Marek Kalenik
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Suspended Solids ◽  
Ammonia Nitrogen ◽  
Phosphorus Compounds ◽  
Medium Sand ◽  
Nitrogen And Phosphorus ◽  
Sand Soil ◽  
Reduction Efficiency ◽  
Sewage Purification

The model investigations of sewage purification were carried out in a medium sand bed with an assisting hydro-anthracite layer with thickness of 0.10 and 0.20 m. It has been observed that the effectiveness of sewage purification related to basic qualitative parameters (total suspended solids – TSS, BOD5, COD, total nitrogen, total phosphorus) is in accordance with the Polish standards on sewage disposal into grounds and surface water. It has been stated that the medium sand soil bed with the 0.20-meter thick assisting hydro-anthracite layer shows higher effectiveness of sewage purification than the 0.10 m thick assisting layer. This application in the medium sand soil bed increased the removal efficiency regarding TSS by 3.1%, total nitrogen by 29.4%, ammonia nitrogen by 1.2% and total phosphorus by 23.0%, and reduction efficiency regarding BOD5 by 1.5% and COD by 11.3% with relation to the 0.10-meter thick assisting hydro-anthracite layer (all percentages – in average). The investigations confirm that the hydro-anthracite with the granulation of 1.8–2.5 mm can be used to assist in removal of nitrogen and phosphorus compounds from sewages

scholarly journals Spatiotemporal distribution of nitrogen and phosphorus in alpine lakes in the Sanjiangyuan Region of the Tibetan Plateau

2017 ◽  
Vol 76 (2) ◽  
pp. 396-412 ◽  
Author(s):  
Su-jin Lu ◽  
Jian-huan Si ◽  
Chuan-ying Hou ◽  
Yu-si Li ◽  
Meng-meng Wang ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Nitrate Nitrogen ◽  
Quality Standards ◽  
Alpine Lakes ◽  
Ammonia Nitrogen ◽  
Sea Star ◽  
Water Quality Standards ◽  
Nitrogen And Phosphorus ◽  
Nitrite Nitrogen

To provide a theoretical basis for alpine source lake protection, ten samples were taken from each lake annually from 2012 to 2015. Each year, the various species of nitrogen and phosphorus nutrients were measured. The average contents of nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus, and total nitrogen in the four lakes are 0.195–0.0 mg/L, 0.038–0.143 mg/L, 0.004–0.168 mg/L, 0.006–0.740 mg/L, and 0.050–0.547 mg/L, respectively. The total phosphorus contents in Eling Lake, Longbao Lake and Sea Star were higher than Class I water quality standards, and the total nitrogen contents in Eling Lake, Sea Star and Zhaling Lake were higher than Class I water quality standards as well. The concentration contour maps of the nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus and total nitrogen showed that the indicators of the four lakes in the east, the west, and the center of the lake did not have the same trend. From 2012 to 2015, each of the measured nutrients showed a rising trend year by year. The four lakes are polluted by both endogenous and exogenous pollution, and it is necessary to limit the exogenous pollution and protect the alpine lakes immediately.

Influence of the Dissolution Laws of N, P on the Activated Sludge by Ozone Oxidation

2013 ◽  
Vol 295-298 ◽  
pp. 1215-1221
Author(s):  
Rong Wang ◽  
Ai Ping Tang
Keyword(s):  
Activated Sludge ◽  
Total Phosphorus ◽  
High Efficiency ◽  
Ammonia Nitrogen ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Ozone Oxidation ◽  
Conventional Activated Sludge ◽  
Long Time

The high sludge production has becoming one of the main drawbacks in the conventional activated sludge process. The ozone oxidation is considered as one of the most effective techniques owing to its high efficiency and non-secondary pollution. In this paper, the solubilization rules of nitrogen and phosphorus with directing injection ozone in a static unit were studied, then, the long-term removal rates of ammonia nitrogen and total phosphorus in SBR system of directing injection ozone were studied with ozone dosage from 0.01～0.04gO3/gSS. The results of static experiments showed that the nitrate concentration increased quickly from 3.52mg/L to 13.83mg/L, the concentration of organic nitrogen and ammonia increased slightly, whereas, the nitrite concentration decreased gradually at the ozone dosage of 0～0.15gO3/gSS, most of the nitrogen released from the ozonated sludge were escaped from the supernate in the form of nitrogen and ammonia. The result of long-time experiment in SBR system showed that the removal rates of ammonia and total phosphorus was 91.1%, 80.5%, respectively.

scholarly journals Adsorption of Nitrogen and Phosphorus in Water by Eggshell Modified with FeCl3

2021 ◽  
Vol 245 ◽  
pp. 03081
Author(s):  
Hongcui Li ◽  
Yurong Li ◽  
Feifei Yan ◽  
Xiangzheng Yin
Keyword(s):  
Adsorption Capacity ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Ferric Chloride ◽  
Ph Value ◽  
Orthogonal Experiment ◽  
Maximum Adsorption Capacity ◽  
Nitrogen And Phosphorus ◽  
Adsorption Effect ◽  
Adsorption Of Nitrogen

As a kind of domestic waste, eggshell has developed pore structure and good adsorption capacity. The material was selected as adsorbent to study the adsorption of total nitrogen and total phosphorus in water. After being modified by ferric chloride, its adsorption effect is greatly enhanced. The adsorption of nitrogen and phosphorus in water by eggshell modified by ferric chloride was studied under different conditions. The experimental results show that the adsorption capacity after modification is 15% ~ 40% higher than that before modification. The results of orthogonal experiment show that under the following conditions: pH value was 5.00, dosage was 0.050 g, time was 65 min, the maximum adsorption capacity of total phosphorus was 45.34 mg/g; under the following conditions: pH value was 4.50, dosage was 0.100 g, time was 60 min, the maximum adsorption capacity of total nitrogen was 79.91 mg/g.

scholarly journals Eggshell and Bacterial Cellulose Composite Membrane as Absorbent Material in Active Packaging

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
S. Ummartyotin ◽  
P. Pisitsak ◽  
C. Pechyen
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Bacterial Cellulose ◽  
Composite Membrane ◽  
Active Packaging ◽  
Thermal And Mechanical Properties ◽  
Adsorption Experiment ◽  
Absorbent Material ◽  
Cellulose Composite ◽  
Thermal Stability Of

Bacterial cellulose and eggshell composite was successfully developed. Eggshell was mixed with bacterial cellulose suspension and it was casted as a composite film. CaCO3derived from eggshell was compared with its commercial availability. It can be noted that good dispersion of eggshell particle was prepared. Eggshell particle was irregular in shape with a variation in size. It existed in bacterial cellulose network. Characterization on composite was focused on thermal and mechanical properties. It showed that flexibility and thermal stability of composite were enhanced. No significant effect of mechanical properties was therefore observed. The thermal stability of composite was stable up to 300°C. The adsorption experiment on water and vegetable oil capacity was performed. The enhancement on adsorption was due to the existence of eggshell in bacterial cellulose composite. It exhibited the potential to be a good candidate for absorbent material in active packaging.

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