Open Access<i>Technical note</i> Biological treatment of industrial wastewater containing formaldehyde and formic acid
Author(s) -
M. Eiroa,
José A. Vilar,
Christian Kennes,
María C. Veiga
Publication year - 2007
Publication title -
water s.a./water sa
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.389
H-Index - 59
eISSN - 1816-7950
pISSN - 0378-4738
DOI - 10.4314/wsa.v32i1.5232
Subject(s) - kjeldahl method , formic acid , formaldehyde , chemistry , wastewater , organic matter , nitrogen , environmental chemistry , total organic carbon , dissolved organic carbon , pulp and paper industry , nuclear chemistry , zoology , chromatography , environmental engineering , organic chemistry , environmental science , biology , engineering
The biological treatment of wastewater from an aminoplastic resin-producing industry was studied in a pre-denitrifica- tion system. This study reports results on the removal of organic matter and nitrogen compounds from wastewater which contained high levels of formaldehyde and formic acid. The formaldehyde concentration in the feed varied between 2 087.0 and2 200.0 mg/ℓ, the mean removal being 99.9%. The mean efficiency of formic acid removal was 99.7%, and its concentration inthe feed ranged between 1 384.6 and 1 513.9 mg/ℓ. The total organic carbon (TOC) values in the feed varied from 1 423.0 to1 599.5 mg/ℓ, corresponding to an organic loading rate of about 0.20 kg TOC/m3•d. High TOC removal was achieved, around92.0%. With regard to nitrogen compounds, the total Kjeldahl nitrogen (TKN) concentration in the feed ranged between 467.8 and 492.3 mg/ℓ. The applied nitrogen loading rate was around 0.06 kg TKN/m3•d, and the mean percentage of TKN removal was 76.7%