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Purifying residual water contg. organic substances by adding urea and formaldehyde, sepg. the resin by filtration or sedimentation and purifying the water biologically after neutralising
Date issued
1985-06-28
Author(s)
Parmac, Sorin
Buliga, A.
Chiru, Epsica
Dumitrescu, Emil
Costov, Ioan
Cruceru, Mihail
Varlam, C.
Pristavu, N.
Abstract
Residual waters contg. organic substances, expressed as CCOOr 15000-50000 mg/l, are treated, at 40-80
deg.C, with 0.15-1 mol urea and 0.15-1 mol HCHO. The urea HCHO ratio is 1:1 to 1:2. The resin formed is sepd. by filtration or sedimentation. The treated water is neutralized at pH 0.2-0.5 and then purified biologically.
deg.C, with 0.15-1 mol urea and 0.15-1 mol HCHO. The urea HCHO ratio is 1:1 to 1:2. The resin formed is sepd. by filtration or sedimentation. The treated water is neutralized at pH 0.2-0.5 and then purified biologically.
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