scholarly journals TiO2Photocatalyst Nanoparticle Separation: Flocculation in Different Matrices and Use of Powdered Activated Carbon as a Precoat in Low-Cost Fabric Filtration

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Carlos F. Liriano-Jorge ◽  
Ugur Sohmen ◽  
Altan Özkan ◽  
Holger Gulyas ◽  
Ralf Otterpohl
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Powdered Activated Carbon ◽  
Widespread Application ◽  
Fabric Filter ◽  
Nanoparticle Separation ◽  
Ph Range ◽  
The Impact

Separation of photocatalyst nanoparticles is a problem impeding widespread application of photocatalytic oxidation. As sedimentation of photocatalyst particles is facilitated by their flocculation, the influence of common constituents of biologically pretreated wastewaters (NaCl, NaHCO3, and their combination with humic acid sodium salt) on flocculation was tested by the pipet method. Results showed that the impact of these substances on TiO2nanoparticle flocculation is rather complex and strongly affected by pH. When humic acid was present, TiO2particles did not show efficient flocculation in the neutral and slightly basic pH range. As an alternative to photocatalyst separation by sedimentation, precoat vacuum filtration with powdered activated carbon (PAC) over low-cost spunbond polypropylene fabrics was tested in the presence of two PAC types in aqueous NaCl and NaHCO3solutions as well as in biologically treated greywater and in secondary municipal effluent. PAC concentrations of≥2 g/L were required in order to achieve a retention of nearly 95% of the TiO2nanoparticles on the fabric filter when TiO2concentration was 1 g/L. Composition of the aqueous matrix and PAC type had a slight impact on precoat filtration. PAC precoat filtration represents a potential pretreatment for photocatalyst removal by micro- or ultrafiltration.

scholarly journals The impact of humic acid on metaldehyde adsorption onto powdered activated carbon in aqueous solution

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Zhuojun Li ◽  
Yuchen Yang ◽  
Ulises Jáuregui-Haza ◽  
Zhengxiao Guo ◽  
Luiza Cintra Campos
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Humic Acid ◽  
Powdered Activated Carbon ◽  
The Impact

Powdered activated carbon with abundant micropores and mesopores can effectively remove metaldehyde from aqueous solution in the presence of humic acid.

Evaluation of refractory organic removal in combined biological powdered activated carbon - microfiltration for advanced wastewater treatment

2001 ◽  
Vol 43 (11) ◽  
pp. 67-74 ◽  
Author(s):  
G. T. Seo ◽  
S. Ohgaki
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Growth Parameter ◽  
Powdered Activated Carbon ◽  
Sewage Effluent ◽  
Permeate Flux ◽  
Arabic Gum ◽  
Biological Growth ◽  
Toc Removal ◽  
Refractory Organic Matter

Biological powdered activated carbon (BPAC) was incorporated with a microfiltration (MF, 0.2 μm pore size) system to remove the refractory organic matter contained in secondary sewage effluent. A synthetic secondary sewage effluent was used as influent in this study, containing both non-biodegradable organic substances (such as humic acid, lignin sulfonate, tannic acid and arabic gum powder) and biodegradable ones. These refractory organic materials were possibly degraded in contact with microorganisms for 20-27 days. Although humic acid and arabic gum were weakly adsorbed on the activated carbon, they could be effectively removed in the BPAC reactor. The TOC removal at a powdered activated carbon (PAC) concentration of 20 g/L was higher than at 0.5-2 g PAC/L (83% and 66-68%, respectively). The higher removal efficiency was due to the increased rejection at the membrane module in which most of the PAC was accumulated. More than 90% of non-biodegradable compounds removal (detected as E280 , UV absorption at 280 nm) occurred in the BPAC reactor. The biological growth parameter b/Y, used in system design, was estimated to be 0.017 d-1. Relatively high permeate flux of 1.88 m/d could be obtained even at higher PAC concentration of 20 g/L.

scholarly journals Synthetic Wastewater Treatment using Agro-Based Adsorbents

2021 ◽  
Vol 18 (11) ◽  
Author(s):  
Saisantosh Vamshi Harsha MADIRAJU ◽  
Yung-Tse HUNG ◽  
Howard Hao-Che PAUL
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Organic Carbon ◽  
Low Cost ◽  
Orange Peel ◽  
Powdered Activated Carbon ◽  
Synthetic Wastewater ◽  
Batch Adsorption ◽  
Peanut Hull ◽  
Naphthol Green B

This study was undertaken to determine the treatment a binary mixture of dye wastewater (containing Naphthol Green B) and the sugar industry wastewater for removal of color. The specific treatment in the current research consists of adsorption using low-cost adsorbents and microfiltration using Whatman-41 microfilters. Considerations of this treatment process are to take the samples using batch adsorption and avoid coagulation with further dilution. Numerous runs are made, with the ideal waste samples prepared in the laboratory. As a 1st step in the study, different dye concentrations are considered using different concentrations of sugar wastewater. Samples are treated with 3 different Agro-based low-cost adsorbents (orange peel, peanut hull, and Powdered Activated Carbon (PAC)). Transmittance values for Naphthol Green B after treatment with orange peel and peanut hull are 83.12 % and 76.98 % respectively. Peanut hull has the highest transmittance of 76.98 % with < 425 µm size. Orange peel contributes to the highest transmittance of 83.12 % with a 2 g dosage. The values of transmittance after treatment with PAC are taken as the datum for the comparison of adsorption performance after treatment using orange peel and peanut hull. Peanut hull has the highest Non-Purgeable Organic Carbon (NPOC) measurement of 37.86 mg/L when mixed with 600 ppm of sugar wastewater. Similarly, when mixed with 600 ppm of sugar wastewater, orange peel contributes to the NPOC value of 35.06 mg/L. These treated samples using low-cost adsorbents can be considered as pre-treated wastewater that can be sent to municipal wastewater treatment plants. HIGHLIGHTS Orange Peel and Peanut Hull are the Agro-based low-cost adsorbents for color removal Wastewater treated with Peanut Hull has high Non-Purgeable Organic Carbon measurement Peanut hull has the highest transmittance of 76.98 % with < 425µm size Orange peel contributes to the highest transmittance of 83.12 % with a 2 g dosage Powdered Activated Carbon is considered as a reference adsorbent in this study GRAPHICAL ABSTRACT

scholarly journals Oily wastewater treatment by adsorption–membrane filtration hybrid process using powdered activated carbon, natural zeolite powder and low cost ceramic membranes

2017 ◽  
Vol 76 (4) ◽  
pp. 895-908 ◽  
Author(s):  
Yaser Rasouli ◽  
Mohsen Abbasi ◽  
Seyed Abdollatif Hashemifard
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Natural Zeolite ◽  
Low Cost ◽  
Ceramic Membranes ◽  
Powdered Activated Carbon ◽  
Hybrid Process ◽  
Oily Wastewater ◽  
Alumina Membranes ◽  
Oily Wastewater Treatment

In this research, four types of low cost and high performance ceramic microfiltration (MF) membranes have been employed in an in-line adsorption–MF process for oily wastewater treatment. Mullite, mullite-alumina, mullite-alumina-zeolite and mullite-zeolite membranes were fabricated as ceramic MF membranes by low cost kaolin clay, natural zeolite and α-alumina powder. Powdered activated carbon (PAC) and natural zeolite powder in concentrations of 100–800 mg L−1 were used as adsorbent agent in the in-line adsorption–MF process. Performance of the hybrid adsorption–MF process for each concentration of PAC and natural zeolite powder was investigated by comparing quantity of permeation flux (PF) and total organic carbon (TOC) rejection during oily wastewater treatment. Results showed that by application of 400 mg L−1 PAC in the adsorption–MF process with mullite and mullite-alumina membranes, TOC rejection was enhanced up to 99.5% in comparison to the MF only process. An increasing trend was observed in PF by application of 100–800 mg L−1 PAC. Also, results demonstrated that the adsorption–MF process with natural zeolite powder has higher performance in comparison to the MF process for all membranes except mullite-alumina membranes in terms of PF. In fact, significant enhancement of PF and TOC rejection up to 99.9% were achieved by employing natural zeolite powder in the in-line adsorption–MF hybrid process.

Adsorption of humic acid by powdered activated carbon in saline water conditions

Desalination ◽  
2003 ◽  
Vol 151 (1) ◽  
pp. 53-66 ◽  
Author(s):  
Jinming Duan ◽  
Francis Wilson ◽  
Nigel Graham ◽  
Joo Hwa Tay
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Saline Water ◽  
Powdered Activated Carbon ◽  
Water Conditions
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