Wet air oxidation of anaerobically digested sludge

Document Type

Article

Publication Date

1-1-1987

Abstract

Anaerobically digested municipal sludge was thermally oxidized in the aqueous phase (wet air oxidation) for 1 hour. The reduction of total solids, chemical oxygen demand, and the generation of volatile acids, phosphate, ammonia, and organic nitrogen were investigated. The contents of six metals and the settleability of wet oxidation effluent slurry were also investigated. In general, oxidation was significantly affected by temperature. Volatile solids destruction exhibited a typical cumulative normal temperature distribution. There was no difference in oxidized sludge between digested sludge taken from either the thermophilic or mesophilic digester or from different digestion conditions. The wet oxidation converted solids to simple carbohydrate, acetic acid, ammonia, and organic nitrogen. The settling characteristic of the wet oxidation slurry improved. Also, no soluble Cd or Pb was present in the filtrate. However, soluble Cu was continuously present, and Ni, Zn, and Mn were detected occasionally.

Identifier

0023553356 (Scopus)

Publication Title

Journal of the Water Pollution Control Federation

ISSN

00431303

First Page

39

Last Page

46

Issue

1

Volume

59

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