Development and application of Palygorskite porous ceramsite in a biological aerated filter (BAF)

Bao, Teng, Chen, Tian-hu, Qing, Chengsong, Jin Xie, Jin, & Frost, Ray L. (2016) Development and application of Palygorskite porous ceramsite in a biological aerated filter (BAF). Desalination and Water Treatment, 57(4), pp. 1790-1803.

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Abstract

Novel filter Palygorskite porous ceramsite (PC) was prepared using Palygorskite clay, poreforming material sawdust, and sodium silicate with a mass ratio of 10:2:1 after sintering at 700°C for 180 min. PC was characterized with X-ray diffraction, X-ray fluorescence, scanning electron microscopy, elemental, and porosimetry. PC had a total porosity of 67% and specific surface area of 61 m2/g. In order to assess the usefulness of PC as a medium for biological aerated filters (BAF), PC and (commercially available ceramsite) CAC were used to treat wastewater city in two laboratory-scale upflow BAFs. The results showed that the reactor containing PC was more efficient than the reactor containing CAC in terms of total organic carbon (TOC), ammonia nitrogen (NH3-N), and the removal of total nitrogen (TN) and phosphorus (P). This system was found to be more efficient at water temperatures ranging from 20 to 26°C, an air–water (A/W) ratio of 3:1, dissolved oxygen concentration >4.00 mg/L, and hydraulic retention time (HRT) ranging from 0.5 to 7 h. The interconnected porous structure produced for PC was suitable for microbial growth, and primarily protozoan and metazoan organisms were found in the biofilm. Microorganism growth also showed that, under the same submerged culture conditions, the biological mass in PC was significantly higher than in CAC (34.1 and 2.2 mg TN/g, respectively). In this way, PC media can be considered suitable for the use as a medium in novel biological aerated filters for the simultaneous removal of nitrogen and phosphorus.

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ID Code: 79688
Item Type: Journal Article
Refereed: Yes
Additional Information: Published online: 24 Nov 2014
Keywords: Palygorskite porous ceramsite, Simultaneous nitrification and denitrification, Simultaneous removal of nitrogen and phosphorus, Biofilm
DOI: 10.1080/19443994.2014.976770
ISSN: 1944-3986
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Balaban Desalination Publications
Copyright Statement: The Version of Record of this manuscript has been published
and is available in Desalination and Water Treatment <date of publication> http://www.tandfonline.com/10.1080/19443994.2014.976770
Deposited On: 05 Jan 2015 23:34
Last Modified: 05 May 2016 16:05

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