scholarly journals Dewatered alum sludge: a potential adsorbent for phosphorus removal

2006 ◽  
Vol 54 (5) ◽  
pp. 207-213 ◽  
Author(s):  
Y. Yang ◽  
D. Tomlinson ◽  
S. Kennedy ◽  
Y.Q . Zhao
Keyword(s):  
Water Treatment ◽  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
Adsorption Process ◽  
Study Groups ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Capacities ◽  
Alum Sludge ◽  
Best Fit

Alum sludge refers to the by-product from the processing of drinking water in water treatment works. In this study, groups of batch experiments were designed to identify the characteristics of dewatered alum sludge for phosphorus adsorption. Air-dried alum sludge (moisture content 10.2%), which was collected from a water treatment works in Dublin, was subjected to artificial P-rich wastewater adsorption tests using KH2PO4 as a model P source. Adsorption behaviours were investigated as a function of amount and particle size of alum sludge, pH of solution and adsorption time. The results have shown that pH plays a major role not only in the adsorption process but also in the adsorption capacity. With regard to adsorption capacity, this study reveals the Langmuir adsorption isotherm being the best fit with experimental data (R2=0.98–0.99). The maximum adsorption capacities range from 0.7 to 3.5 mg-P/g when the pH of the synthetic P solution was varied from 9.0 to 4.3, accordingly. The outcome of this study indicated that alum sludge is suitable for use as an adsorbent for removal of phosphate from wastewater.

Behavior of Phosphorus Adsorption from Aqueous Solutions on Modified Activated Alumina

2010 ◽  
Vol 152-153 ◽  
pp. 945-949
Author(s):  
Chun Sheng Ding ◽  
Ying Long Zou ◽  
Fang Ming Ni ◽  
Qian Fen Zhu
Keyword(s):  
Phosphorus Removal ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Phosphorus Concentration ◽  
Activated Alumina ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Ph Values ◽  
Monolayer Adsorption ◽  
Adsorption Data

In the study, activated alumina was modified by calcium chloride, and after modification the phosphorus removal from aqueous solution increased by 13% or so. Then the activated alumina with and without treatment were subjected to characterization by the methods of the BET and SEM, and the adsorption characteristics of modified activated alumina were further studied at different contact time, pH values, adsorbent dosage levels and initial phosphorus concentration. Moreover, the equilibrium adsorption data for phosphorus were better fitted to Langmuir adsorption isotherm, and it means that the uptake of phosphorus preferably followed the monolayer adsorption process.

Characteristics of Phosphorus Adsorption of Aerated Concrete in Wastewater Treatment

2011 ◽  
Vol 183-185 ◽  
pp. 466-470 ◽  
Author(s):  
Wei Guo Fu ◽  
Ping Ping Li
Keyword(s):  
Adsorption Capacity ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Construction Process ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Engineering Measures ◽  
Aerated Concrete ◽  
Isotherm Equations

Constructed wetlands are widely used throughout the world to treat a wide variety of wastewater. Numerous researches on phosphorus removal have been reported, however, in practice, phosphorus removal efficiency through the constructed wetland is still relatively lower due to various reasons. In this paper, the phosphorus adsorption capacity of aerated concrete (a building material) was investigated by using Freundlich and Langmuir adsorption isotherm equations, and then the possibility, using aerated concrete waste residues for the treatment of effluent with relatively higher concentration phosphorus at the outfall of constructed wetland end through certain engineering measures, was explored. The results showed that aerated concrete not only had a higher phosphorus adsorption capacity (6.064mg/g), but also had a higher adsorption rate, compared with some other substrate materials commonly used for constructed wetlands. Coupled with the lightweight characteristic of aerated concrete, the imagination of the secondary purification pond was likely to be formed. If the imagination turns into a reality, it will not only effectively purify sewage emissions from the constructed wetland forever, but also realize the resource utilization of large quantities of aerated concrete waste residues resulting from the construction process.

scholarly journals Removal of triphenylmethane dye from aqueous solutions through an adsorption process over waste materials

2020 ◽  
Vol 10 (4) ◽  
pp. 5772-5779
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Dye Removal ◽  
Functional Group ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Pseudo Second Order ◽  
Best Fit

Water pollution is the most significant issue due to rapid growing industrial development especially textile dye industry. Therefore, the adsorption process experiment was conducted to determine the removal ability of the adsorbent chosen. The removal rate and adsorption capacity of Phenol red and Cresol were analyzed by using eggshell adsorbent in the adsorption process. The experiment was conducted with parameters of initial concentration, dosage, pH and contact time. Results indicated that the removal rate achieved more than 90% and the adsorption capacity exceeded more than 5 mg/g. The functional group before adsorption process eggshell adsorbent and after adsorption process eggshell adsorbent was analyzed by using FTIR (Fourier Transform Infrared Spectroscopy). The study of adsorption isotherm and kinetics model was carried out to identify the efficiency of the eggshell adsorbent reacting with the dye solution. The adsorption isotherm that applied in this research was Langmuir isotherm, Jovanovic isotherm and Freundlich isotherm. Moreover, Pseudo-first-order and Pseudo-second-order chosen were conducted to determine the kinetic studies. In short, eggshell adsorbent is highly effective on dye removal through adsorption capacity. The functional group of the eggshell adsorbent was found such as alcohols, phenol, alkanes, carbonyls, ester, saturated aliphatic, aldehydes, aromatics, 2°amines and phosphorus. For kinetics study, Freundlich isotherm was analyzed as the best fit isotherm model as it achieved the highest R2 value which is closed to 1 and Pseudo-second-order was analyzed as the best fit kinetic model in this experiment. Therefore, eggshell adsorbent is highly effective in dye removal.

Phosphorus Removal in Constructed Wetlands Using Gravel and Industrial Waste Substrata

1993 ◽  
Vol 27 (1) ◽  
pp. 107-113 ◽  
Author(s):  
R. A. Mann ◽  
H. J. Bavor
Keyword(s):  
Adsorption Capacity ◽  
Constructed Wetlands ◽  
Phosphorus Removal ◽  
Industrial Waste ◽  
Large Scale ◽  
Maximum Adsorption Capacity ◽  
Phosphorus Adsorption ◽  
Freundlich Isotherms ◽  
Linear Profiles ◽  
Furnace Slag

The phosphorus removal efficiency of three gravel based constructed wetland systems (CWSs) has been investigated in a two year study in which secondary sewage effluent was treated. The constructed wetlands systems, 100m × 4m × 0.5m with an impervious liner, comprised an unplanted gravel “control” trench and gravel trenches planted with monoculture stands of either Typhaorientalis or Schoenoplectusvalidus. Inlet and outlet phosphorus concentrations and vertical and linear profiles of phosphorus were determined to characterise immobilisation/translocation through the systems. Laboratory phosphorus adsorption experiments were conducted with regional gravels and alternative adsorptive media including industrial slag and ash by-products. Phosphorus adsorption in the large scale gravel systems was variable and ranged from −40% to 40%. Laboratory adsorption capacity studies conducted with the gravel substratum indicated that field adsorption potential could be successfully simulated and modelled. Ion exchange experiments have been used to evaluate gravel and industrial conglomerates, with a view to improving phosphorus immobilisation through substratum selection and effluent flow management. Langmuir and Freundlich isotherms characterised phosphorus adsorption and the maximum adsorption capacity of regional gravels ranged from 25.8 to 47.5 μg P/g compared to blast furnace slag 160 to 420 μg P/g and fly ash 260 μg P/g. These results indicate that further investigations into the inclusion of industrial waste substrata in a CWS are warranted.

Thermodynamic Properties of Modified Sepiolite Phosphorus Removal

2013 ◽  
Vol 726-731 ◽  
pp. 234-238
Author(s):  
Wen Quan
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
Theoretical Foundation ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Phosphorus Adsorption ◽  
Depth Study ◽  
Adsorption Amount

this thesis makes an in-depth study on the adsorption properties of modified sepiolite to phosphorus, and confirms how the factors such as, phosphorus wastewater flow, phosphorus removal agent dosage, temperature, additives and other factors effect on the phosphorus adsorption thermodynamic equilibrium of modified sepiolite. With the increase of phosphorus removal agent of modified sepiolite, adsorption capacity of modified sepiolite phosphorus removal to PO43- ions in wastewater decreases; the removal rate increases with the increase removal agent; improving the acid modified temperature favors the adsorption of compound phosphorus removal to sepiolite; adsorption amount increases with the calcination temperature of sepiolite. This thesis describes the adsorption capacity of the modified sepiolite to phosphorus changes with temperature. According to the experimental data, adsorption isotherms at different temperature are presented in this thesis. And a theoretical foundation is provided for the industrial application of modified sepiolite phosphorus removal.

Adsorption of Cu(II) and Zn(II) Ions by Solidified Landfilled Sludge and its Pyrolyzed Produce

2014 ◽  
Vol 955-959 ◽  
pp. 2629-2634 ◽  
Author(s):  
Wu Yao ◽  
Wei Qin Zhu ◽  
Yin Na Zhan ◽  
Yang Wu
Keyword(s):  
Surface Roughness ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Functional Group ◽  
Adsorption Process ◽  
Langmuir Equation ◽  
Ftir Analysis ◽  
Aromatic Rings ◽  
Adsorption Capacities ◽  
Hydroxy Aldehydes

In this study, using solidified landfilled sludge (SLS) and its pyrolyzed produce (PSLS) as adsorbents, adsorption characteristics of Cu2+and Zn2+onto SLS and PSLS was investigated. These results revealed that PSLS had more irregular pores and its surface roughness increased, and the surface area of PSLS was twice than that of SLS. Adsorption studies showed that adsorption capacity of Cu2+and Zn2+increased with the increasing dosage of adsorbents, and the adsorption process of Cu2+and Zn2+onto SLS or PSLS could be divided into the first rapid step and the second slower step. Based on Langmuir equation, the maximum limiting adsorption capacities of Cu2+and Zn2+onto PSLS was much higher that onto SLS. Moreover, FTIR analysis showed that the adsorption of Cu2+and Zn2+on SLS depended on active functional group such as hydroxy aldehydes while that relied on the groups such as C=C bond of aromatic rings, Si-O-Si or Si-O-C structures for PSLS.

scholarly journals Assessment of the Different Type of Materials Used for Removing Phosphorus from Wastewater

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4371
Author(s):  
Claudiu Cepan ◽  
Adina-Elena Segneanu ◽  
Oana Grad ◽  
Maria Mihailescu ◽  
Melinda Cepan ◽  
...  
Keyword(s):  
Water Quality ◽  
Phosphorus Removal ◽  
Adsorption Process ◽  
Magnetic Semiconductors ◽  
Optimal Level ◽  
Phosphorus Adsorption ◽  
Processing Cost ◽  
Different Types ◽  
Before And After ◽  
Materials Used

Reducing the costs associated with water management, improving water quality and the environment are fundamental requirements of sustainable development. Maintaining the optimal level of phosphorus has a direct impact on water quality and the biological system. Current methods used in tertiary wastewater treatment for phosphorus removal present several disadvantages that influence the final water processing cost. Therefore, it is essential for water quality and food safety to develop ecological, cheap and highly efficient materials. This study reported the first comparative assessment of three different types of materials (magnetic, semiconductors and composite) as environmentally friendly, cheap adsorbents for phosphorus removal from wastewater. Several experiments were done to investigate the influence of adsorbent type, dosage and contact time on the efficiency of the processes. The adsorption process was fast and equilibrium was reached within 150 min. We found that the phosphorus adsorption efficiency on of these materials was higher than the chemical method. The obtained results indicated that specific surface area directly influences the performance of the adsorption process. EDS analysis was used to analyze adsorbents composition and analyze the type and content of elements in the substrate before and after reaction with wastewater.

scholarly journals Fabrication of Ceramsite Adsorbent from Industrial Wastes for the Removal of Phosphorus from Aqueous Solutions

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yue Yin ◽  
Gaoyang Xu ◽  
Linlin Li ◽  
Yuxing Xu ◽  
Yihan Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
High Efficiency ◽  
Column Experiment ◽  
Industrial Wastes ◽  
Phosphorus Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Phosphorus Adsorption

A more applicable adsorbent was fabricated using industrial wastes such as red mud, fly ash, and riverbed sediments. The heavy metal inside the raw materials created metal hydroxy on the adsorbent surface that offered elevated adsorption capacity for phosphorus. The required equilibrium time for the adsorption is only 10 min. The theoretical maximum adsorption capacity of the adsorbent was 9.84 mg·g−1 inferred from the Langmuir adsorption isotherm. Higher solution pH favored phosphorus adsorption. Kinetics study showed that the adsorption could be better fitted by the pseudo-second-order kinetic model. The presence of coexisting anions had no significant adverse impact on phosphorus removal. The speciation of the adsorbed phosphorus indicated that the adsorption to iron and aluminum is the dominating adsorption mechanism. Moreover, a dynamic adsorption column experiment showed that, under a hydraulic time of 10 min, more than 80% of the phosphorus in the influent was removed and the surplus phosphorus concentration was close to 0.1 mg L−1. The water quality after adsorption revealed its applicability in real treatment. Consequently, the adsorbent synthesized from industrial wastes is efficient and applicable due to the high efficiency of phosphorus removal and eco-friendly behavior in solutions.

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