scholarly journals Experimental Study of the Adsorption of Nitrogen and Phosphorus by Natural Clay Minerals

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Tingyu Fan ◽  
Miao Wang ◽  
Xingming Wang ◽  
Yingxiang Chen ◽  
Shun Wang ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Clay Minerals ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Order Kinetic ◽  
Natural Clay ◽  
Nitrogen And Phosphorus ◽  
Adsorption Capacities ◽  
Adsorption Of Nitrogen ◽  
Kinetics And Isotherms

Nitrogen and phosphorus are commonly recognized as causing eutrophication in aquatic systems, and their transport in subsurface environments has also aroused great public attention. This research presented four natural clay minerals (NCMs) evaluated for their effectiveness of NH4+ and PO43- adsorption from wastewater. All the NCMs were fully characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), BET analysis, and adsorption kinetics and isotherms to better understand the adsorption mechanism-property relationship. The results show that the adsorption efficiency of the four NCMs for phosphate was better than that for ammonia nitrogen. The removal rate of phosphate was higher than 65%, generally in the range of 80%-90%, while the removal rate of ammonia nitrogen was less than 50%. The adsorption kinetic behavior followed the pseudo-second-order kinetic model. The ammonia nitrogen adsorption isotherm was in good agreement with the Freundlich isotherm equilibrium model, and the phosphate adsorption isotherm matched the Langmuir model. Among all the NCMs studied, bentonite (7.13 mg/g) and kaolinite (5.37 mg/g) showed higher adsorption capacities for ammonia nitrogen, while zeolite (0.21 mg/g) and attapulgite (0.17 mg/g) showed higher adsorption capacities for phosphate. This study provides crucial baseline knowledge for the adsorption of nitrogen and phosphate by different kinds of NCMs.

Experimental Studies on Enhanced Coagulation of Tail Water

2013 ◽  
Vol 295-298 ◽  
pp. 1478-1481
Author(s):  
Feng Xun Tan ◽  
Jiu Mei Wang ◽  
Dao Ji Wu
Keyword(s):  
Ferric Chloride ◽  
Removal Rate ◽  
Reclaimed Water ◽  
Experimental Studies ◽  
Ammonia Nitrogen ◽  
Raw Water ◽  
Nitrogen And Phosphorus ◽  
Enhanced Coagulation ◽  
Tail Water ◽  
Water Eutrophication

Traditional wastewater treatment methods can no longer remove effectively nitrogen and phosphorus that are the direct murderers of water eutrophication hazard. Enhanced coagulation method was adopted to improve the treatment effect by dosing suitable coagulants and coagulant aids. The raw water was from the reclaimed water in a University. TP and ammonia nitrogen removal of the water had been researched through an enhanced coagulation process with dosing ferric chloride, aluminum sulfate, polymeric ferric chloride, and poly-aluminum chloride (PAC) in this study. The coagulants effects were estimated by determining the removal rate of ammonia nitrogen, TP, COD and turbidity. When dosing the raw water with 80 mg/L PAC, the removal rates of ammonia nitrogen, TP, COD and turbidity are respectively 6.12%, 67.79%, 26.21%, 85.41%. The experimental results can be used as a reference of water treatment in the reclaimed water station.

scholarly journals Optimization of Polyaluminum Chloride-Chitosan Flocculant for Treating Pig Biogas Slurry Using the Box–Behnken Response Surface Method

2019 ◽  
Vol 16 (6) ◽  
pp. 996 ◽  
Author(s):  
Yu Li ◽  
Leigang Li ◽  
Reham Yasser Farouk ◽  
Yuanyuan Wang
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Removal Rate ◽  
Organic Fertilizer ◽  
Ammonia Nitrogen ◽  
Biogas Slurry ◽  
Nitrogen And Phosphorus ◽  
Polyaluminum Chloride ◽  
Surface Method ◽  
Total Ammonia

Flocculation can remove large amounts of nitrogen and phosphorus from wastewater, and the resulting nitrogen- and phosphorus-rich floc can be used to produce organic fertilizer. For biogas slurries containing high levels of nitrogen and phosphorus, ordinary flocculants can no longer meet the flocculation requirements. In this study, to fully utilize the advantages of the two flocculants and achieve efficient removal rates of nitrogen and phosphorus from a biogas slurry, chitosan (CTS) and polyaluminum chloride (PAC) were used as a composite flocculation agent to flocculate pig biogas slurries. The response surface method was used to study the effect of PAC added (PACadded) to the composite flocculant (CF), composite flocculant added (CFadded) to the biogas slurry and the pH on flocculation performance, and optimize these three parameters. In the tests, when the PACadded was 6.79 g·100 mL−1CF, the CFadded was 20.05 mL·L−1 biogas slurry and the pH was 7.50, the flocculation performance was the best, with an absorbance of 0.132 at a wavelength of 420 nm. The total phosphorus (TP) concentration was reduced from 214.10 mg·L−1 to 1.38 mg·L−1 for a removal rate of 99.4%. The total ammonia nitrogen (TAN) concentration was reduced from 1568.25 mg·L−1 to 150.27 mg·L−1 for a removal rate of 90.4%. The results showed that the CF could form larger flocs, and had greater adsorption capacity and more stable flocculation performance than ordinary flocculants. Furthermore, the CF could exhibit better chelation, electrical neutralization and bridge adsorption.

Changes of pH in A2O Process System and its Impact on Nitrogen and Phosphorus Removal

2012 ◽  
Vol 588-589 ◽  
pp. 55-58
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
Ph Value ◽  
Removal Rate ◽  
Phosphorus Release ◽  
Ammonia Nitrogen ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Process System ◽  
High Level

Simulate sewage were used in an anaerobic-anoxic-aerobic biological nutrient removal system(A2O process), by observing the pHs in different compartments and its reflected changes in nitrogen and phosphorus removal, studied on the effects of different pHs on the removal of pollutants. The experiments indicates that the anaerobic phosphorus release showed the main performance of the decline of pH, denitrification in anoxic zone caused the rise of pH, uptake of phosphate in the aerobic zone mainly caused the continuous rise of pH. There is no evidently changes in COD removal, ammonia nitrogen get the highest removal as the pH value was between 8.0-8.5, when pH was at 6.5-7.5, the TN have the maximum removal rate, TP can keep in a high level when the pH was above 6.0.

scholarly journals Adsorption, Modeling, Thermodynamic, and Kinetic Studies of Methyl Red Removal from Textile-Polluted Water Using Natural and Purified Organic Matter Rich Clays as Low-Cost Adsorbent

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Dalila Fkih Romdhane ◽  
Yosra Satlaoui ◽  
Rawya Nasraoui ◽  
Abdelkrim Charef ◽  
Rim Azouzi
Keyword(s):  
Organic Matter ◽  
Clay Minerals ◽  
Low Cost ◽  
Textile Wastewater ◽  
Environmental Benefits ◽  
Solution Temperature ◽  
Polluted Water ◽  
Order Kinetic ◽  
Natural Clay ◽  
Clay Type

Clay minerals have large surface areas that contribute to their high adsorption capacity. Pure clays were often used. However, their prices remain expensive. However, the natural clay minerals that are locally available can have economic and environmental benefits for textile wastewater treatment. The tested natural clays had given low removal yields. Therefore, we wanted to test particular rich organic matter clay for adsorbing azo dye, which is a very toxic molecule. In order to make the use of this clay type have a better efficiency for removal of this dye from the polluted waters, the optimal conditions had been specified. The results indicated that advised conditions were as follows: 5 min was the contact time of dye-clay; the better adsorbent masses were 0.25 g and 0.5 g per 100 ml solution for raw (ANb) and purified clays (ANp), respectively; the initial dye concentrations were 1 gL−1 for raw clay and 50 mgL−1 for purified clay; pH solution had any effect on the yield of dye removal only when raw clay was used; however, acid environment was advised when purified clay was the adsorbent and for the two tested clays about 20–30°C was the better solution temperature. X-Ray diffraction, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) analysis confirmed that functional groups of clay adsorbed the dye. Langmuir maximum adsorption capacities of ANb and ANp were found to be 397 mgg−1 and 132.3 mgg−1 at pH 7 and 5, respectively. Raw and chemically activated samples gave similar results. Adsorption of ANb and ANp data showed better agreement with the pseudo-second-order kinetic model. Thermodynamic parameters of the two adsorbents confirmed that the adsorption was endothermic (ΔH > 0) and spontaneous (ΔG0 < 0). Energy level was high when purified clay was used; however, it was significantly lower when the adsorbent was raw clay. Therefore, it was likely that adsorption by carbonates and organic matter involved small energy amounts. Comparing between these and other previous results, Jebel Louka natural clay type is better recommended for MR removal from textile wastewater, since the removal yield was about 98%. Hence, this tested clay type could provide an alternative low-cost material that could be used in treatment of the textile wastewater rich in MR and the obtained adsorption model and desorption tests provided a background for pilot and industrial scale applications.

A Study on Analyzing the Pollutants of Construction Wastewater in Northern Section of Qinling Tunnel of the YinHanJiWei Project and its Treatment Processes

2012 ◽  
Vol 610-613 ◽  
pp. 2138-2143
Author(s):  
Hou Feng Li ◽  
Peng Kang Jin ◽  
Li Ping Jin ◽  
Dong He ◽  
Xian Bao Wang
Keyword(s):  
Removal Rate ◽  
Formal Analysis ◽  
Water Environment ◽  
Quality Standard ◽  
Ammonia Nitrogen ◽  
Tunnel Construction ◽  
Nitrogen And Phosphorus ◽  
Weihe River ◽  
Construction Characteristic ◽  
Analysis Of Variation

The Qinling tunnel is an important part of hanjiang-to-weihe river water transfers project.In the construction period of northern section of Qinling tunnel, large amount of wastewater was produced and after direct discharged into water, the adverse effects to the environment will become a serious issue. According to the analysis by drilling and blasting method of construction and the prediction of construction wastewater by TBM in the later stage, it can be found that tunnel construction wastewater hashigh SS, low COD as well as relatively small amount of nitrogen and phosphorus nutrients. Therefore, it can be regarded as inorganic polluted wastewater. Meanwhile, by continuous monitoring on wastewater, it proves the accuracy of the formal analysis and prediction. According to the constitution of wastewater, the treatment combined with coagulation, filtration, manganese sand filter, adsorption is proposed. The related researches show thate the mentioned treatmente removal rate for suspended solids, COD and ammonia nitrogen can be more than 90%, 85% and 60% respectively. The treated water quality can meet "The Surface Water Environment Quality Standard"（GB3838-2002）of the Ⅱwater index. Consideration of tunnel construction characteristic and analysis of variation pattern of pollutants in wastewater provide basis and reference for construction wastewater treatment.

scholarly journals Preparation of new diatomite–chitosan composite materials and their adsorption properties and mechanism of Hg(II)

2017 ◽  
Vol 4 (12) ◽  
pp. 170829 ◽  
Author(s):  
Yong Fu ◽  
Xiaoxu Xu ◽  
Yue Huang ◽  
Jianshe Hu ◽  
Qifan Chen ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Kinetic Model ◽  
Contact Time ◽  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Order Kinetic Model

A new composite absorbent with multifunctional and environmental-friendly structures was prepared using chitosan, diatomite and polyvinyl alcohol as the raw materials, and glutaraldehyde as a cross-linking agent. The structure and morphology of the composite absorbent, and its adsorption properties of Hg(II) in water were characterized with Fourier transform infrared (FT-IR) spectra, scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer Emmett Teller (BET) measurements and ultraviolet–visible (UV–Vis) spectra. The effect of the pH value and contact time on the removal rate and absorbance of Hg(II) was discussed. The adsorption kinetic model and static adsorption isotherm and regeneration of the obtained composite absorbent were investigated. The results indicated that the removal of Hg(II) on the composite absorbent followed a rapid adsorption for 50 min, and was close to the adsorption saturation after 1 h, which is in accord with the Langmuir adsorption isotherm model and the pseudo-second-order kinetic model. When the pH value, contact time and the mass of the composite absorbent was 3, 1 h and 100 mg, respectively, the removal rate of Hg(II) on the composite absorbent reached 77%, and the maximum adsorption capacity of Hg(II) reached 195.7 mg g −1 .

scholarly journals Research on the application of compound microorganism preparation in reusing urban reclaimed water in circulating cooling water system

2019 ◽  
Vol 80 (9) ◽  
pp. 1763-1773 ◽  
Author(s):  
Chuanmin Chen ◽  
Yu Wang ◽  
Songtao Liu ◽  
Rongrong Feng ◽  
Xingjia Gu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Removal Rate ◽  
Reclaimed Water ◽  
Water System ◽  
Cooling Water ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Chemical Compositions ◽  
Nitrogen And Phosphorus ◽  
Circulating Cooling Water

Abstract A biological method was developed for reusing urban reclaimed water in circulating cooling water systems (CCWS), in which the compound microorganism preparation (CMP) mainly included nitrobacteria, Bacillus subtilis, photosynthetic bacteria and Thiobacillus denitrificans, was used to control the scaling, corrosion and biofouling of CCWS. The abundant carbon, nitrogen and phosphorus in urban reclaimed water met the needs of microbial growth. Compared with chemical agents, CMP had the advantages of high efficiency, no additional chemicals and being more economical. The research results showed that CMP improved water quality and decreased ammonia nitrogen (NH3-N) and chemical oxygen demand (COD). The concentration ratio of CCWS reached 3.87 using CMP. The corrosion inhibition rate of CMP and the removal rate on biofouling achieved 99.69% and 22.21%, respectively. The mechanisms of CMP to control scaling, corrosion and biofouling were discussed, and the surface characteristics and chemical compositions of corrosion products and biofouling were analyzed.

Research on Strengthening Decomposition of Organic Nitrogen by Ammonibacteria in the Faber Cymbidium Plant Floating Island

2011 ◽  
Vol 340 ◽  
pp. 429-435
Author(s):  
Wen Yi Zhang ◽  
Rong Chen ◽  
Ting Ting Zhao ◽  
Pei Cheng Fang ◽  
Suo Hua Wu
Keyword(s):  
Organic Nitrogen ◽  
High Efficiency ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Decomposition Reaction ◽  
Ammonia Nitrogen ◽  
Order Kinetic ◽  
High Concentration ◽  
Floating Island ◽  
Degradation Reaction

Owing to the characteristics of the effluent with high concentration of ammonia nitrogen and low removal rate in the most artificial plants floating islands, two strains A1, A2 with high-efficiency ammonification screened from the laboratory were selected to use for enhancing decomposition capability of organic nitrogen in the plants floating island in order to improve nitrogen removal. The result showed that the decomposition rate of organic nitrogen by strains A1, A2 were 81.80% and 72.68% respectively, at the same time, decomposition equation was in line with zero order degradation reaction. Moreover, decomposition rates were VA1=0.8310mg/L•h and VA2=0.7619mg/L•h. The simulated ecosystem of sewage treatment was constructed by faber cymbidium (evergreen plant) plant floating island, and then the decomposition reaction of organic nitrogen met first-order kinetic equation in which k was 0.0752. If the strain was put into the previous simulated ecosystem, hydraulic retention time was shortened greatly and the degradation speed of ammonia nitrogen could be accelerated by cooperating action between amonifying bacteria and plant floating island. Furthermore, the ammonia nitrogen of the effluent could meet first discharge demand of integrated wastewater discharge standard (GB8978-1996) after 48h.

Study on the Adsorption of Livestock Wastewater by Bentonite Coated Chitosan

2011 ◽  
Vol 356-360 ◽  
pp. 368-372
Author(s):  
Hong Shao ◽  
Di Zhang
Keyword(s):  
Removal Rate ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Raw Material ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Livestock Wastewater ◽  
Isothermal Adsorption ◽  
Preparation Conditions ◽  
Pseudo Second Order

The bentonite coated chitosan which was prepared of natural bentonite used as raw material and chitosan used as modifying agent applied in the treatment of livestock wastewater. The optimal preparation conditions were obtained and the removal rate of the ammonia nitrogen and COD were 73.09% and 88.94% respectively which raw concentration were 27520mg/L and 2060mg/L by orthogonal experiment. Langmuir isothermal adsorption model and the pseudo-second-order kinetic equation could describe the adsorption process accurately.

scholarly journals Phosphorus Release and Adsorption Properties of Polyurethane–Biochar Crosslinked Material as a Filter Additive in Bioretention Systems

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 283
Author(s):  
Yike Meng ◽  
Yuan Wang ◽  
Chuanyue Wang
Keyword(s):  
Removal Rate ◽  
Phosphorus Release ◽  
Phosphate Adsorption ◽  
Stormwater Treatment ◽  
Isothermal Adsorption ◽  
Phosphorus Pollution ◽  
Adsorption Capacities ◽  
Saturated Water Content ◽  
Phosphate Treatment ◽  
Potential Use

Bioretention systems are frequently employed in stormwater treatment to reduce phosphorus pollution and prevent eutrophication. To enhance their efficiency, filter additives are required but the currently used traditional materials cannot meet the primary requirements of excellent hydraulic properties as well as outstanding release and adsorption capacities at the same time. In this research, a polyurethane-biochar crosslinked material was produced by mixing the hardwood biochar (HB) with polyurethane to improve the performance of traditional filter additives. Through basic parameter tests, the saturated water content of polyurethane-biochar crosslinked material (PCB) was doubled and the permeability coefficient of PCB increased by two orders of magnitude. Due to the polyurethane, the leaching speed of phosphorus slowed down in the batching experiments and fewer metal cations leached. Moreover, PCB could adsorb 93–206 mg/kg PO43− at a typical PO43− concentration in stormwater runoff, 1.32–1.58 times more than HB, during isothermal adsorption experiments. In the simulating column experiments, weaker hydropower reduced the PO43− leaching quantities of PCB and had a stable removal rate of 93.84% in phosphate treatment. This study demonstrates the potential use of PCB as a filter additive in a bioretention system to achieve hydraulic goals and improve phosphate adsorption capacities.

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