A pilot-scale study of tertiary treatment of Jizhuangzi wastewater treatment plant by continuous preozonation-microflocculation-filtration process.
Environ Technol
; 22(3): 331-7, 2001 Mar.
Article
in En
| MEDLINE
| ID: mdl-11346290
ABSTRACT
A pilot-scale study of tertiary wastewater treatment of the JIZHUANGZI Municipal Wastewater Treatment Plant was carried out by preozonation, coagulation and direct filtration process with the aim of producing wastewater suitable for reuse. The proposed treatment scheme could produce a filtered water with lower turbidity, COD(Cr) and colour at lower ozone and coagulant dosages. Ozone was added into the mixing tank with coagulant simultaneously and postozonation was not cost effective. With the increase of ozone dosage, better COD(Cr) and colour removals were observed especially at the ozone dosage between 0.7-1.0 mg l(-1). Similarly, increasing ferric sulphate dosage resulted in better removals of turbidity, COD(Cr) and colour in the filtered water. In contrast, increasing polymer T-80 dosage seemed to improve colour removal rather than turbidity and COD(Cr). To achieve removal efficiency of 70% for turbidity, 45% for COD(Cr) and over 60% for colour, the optimum dosages of ozone, ferric sulphate and polymer T-80 should be 0.7-1.0 mg l(-1), 10.0-12.5 mg l(-1) and 0.7-1.0 mg l(-1), respectively.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ozone
/
Polymers
/
Ferric Compounds
/
Water Purification
/
Filtration
Type of study:
Evaluation_studies
Limits:
Humans
Language:
En
Journal:
Environ Technol
Journal subject:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Year:
2001
Document type:
Article
Affiliation country:
Japan