Title

Highrate Activated Sludge System For Carbon Removal – Pilot Results And Crucial Process Parameters

Keywords

Activated sludge; Carbon removal; COD fractions; High6rate treatment; Low SRT

Abstract

The high6rate activated sludge (HRAS) process is suitable for the removal of organics from wastewater. The application of this process recognizes that there are mainly three forms of substrate in wastewater – particulate, colloidal, and soluble. Particulate and colloidal substrates are removed effectively from solution by biological flocculation whereas the soluble fraction can be removed by intracellular storage, biosynthesis or biological oxidation. Experiments were devised to understand the impact of important process parameters such as solids retention time (SRT), hydraulic residence time (HRT) and dissolved oxygen (DO) levels on the performance of HRAS. The results indicated that DO concentrations of less than 0.5 mg/L had a significant impact on the removal levels of particulate and colloidal chemical oxygen demand (COD). In the case of soluble COD, the removal rates were significantly impacted at DO levels of 0.1 mg/L. Particulate and colloidal COD removal was maximized at SRT and HRT values of 2 days and 30 minutes, respectively. However, the soluble COD removal was high at SRT values of as low as 0.3 days. These results seem to indicate that the removal of soluble substrate is less affected by changes on the process parameters tested during this study than the particulate and colloidal COD removal fractions.

Publication Date

1-1-2013

Publication Title

86th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2013

Volume

4

Number of Pages

2443-2451

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2175/193864713813673848

Socpus ID

85070528674 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85070528674

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