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Many Chinese small electroplating enterprises usually discharge mixed electroplating wastewater which contains CN-, Cr(VI), Cu2+, Zn2+ and other toxic heavy metals. It is hard for efficiently treating this mixed wastewate. At present, conventional chemical methods could usually meet discharge standard, but may not meet recycling need. In this paper, a combined treatment process include O3 oxidation,...
In order to study the dewatering characteristics and efficiency of thickening low concentration excess sludge by Cavitation Air Floatation(CAF), As CAF-5 is employed to thicken low concentration excess sludge in Chaoyangzhou WWPT, the influent flow is 5m3/h, the sludge concentration is 4g/L, the dosage of flocculant FO4440SH is 1.0 kg/tDS and the dosage of surfactant 1227 is 0.2 kg/tDS, the solid...
The performance and enhancement of pollutants removal in raw municipal sewage by a new pretreatment process were investigated in this study. The experiments were carried out with a GS sedimentation tank in full scale plant. The results revealed that average removal efficiency of TP, TSS, and TN achieved 49%, 67.3% and 20% respectively during stable running period. TSS removal rate could achieve about...
The pilot plant study comprised the sequencing batch reactor (SBR) operational mode of a contact oxidation filtration separation integrated bioreactor (CFBR) for treating municipal wastewater. The CFBR was made up of an upper biofilm reactor and a lower gravitational filtration bed. Polyacrylonitrile balls (50mm diameter, 237 m2/m3 specific surface, 90% porosity, and 50.2% packing rate) were filled...
In order to achieve the goal of reusing the mine water with high manganese, this paper studies the mechanism with surface-modified filtration media in treating the mine water from 9th-colliery of Hebei Coal Group. The experiment results show that: the quality of effluent is stable by manganese sand immersed with 3-5% KMnO4, the single cycle can reach 24 hours with manganese less than 0.1 mg/l, and...
Acticarbon can absorb and gather -OH, -X etc. In phenol-containing wastewater these organic micropollutant (such as p-chlorophenol and o-chlorophenol) may affect COD value. After activation treatment, impregnated acticarbon with 6.0% Cu(NO3)2 solution, then put it into a drying oven of 270degC, copper will be reduced and thermosetting on its micro surface. Fixed bed was choosen as the equipment, absorption...
In order to obtain a more efficient method of manganese( II) removal, jar test was used to study the effect of potassium manganese(K2MnO4) pre-oxidation on aluminum chloride (AlCl3) coagulation to remove manganese(II). It was investigated that the effect of the dosage ofK2MnO4, dosing time, sedimentation time and common ions on manganese(II) removal. The results showed that, when K2MnO4 was added...
The ozonizing-biological aerated filter (BAF) process was used to treat the port chemical cabin washing wastewater . According to the characteristics of port chemical cabin washing wastewater with high CODcr, variable quality and complicated composition, the initial pH, the dosage of ozone and catalyzer, the bio-degrade ability of the wastewater, and effect of the hydraulic retention time (HRT) of...
The biological aerated filter-ozonizing-biological aerated filter processes were applied for advanced treatment of dyeing wastewater after secondary biochemical treatment. When the COD of the influent was between 90 mg/L and 150 mg/L, and the color was between 16 times and 32 times, the COD of effluent was reduced to less than 35 mg/L with the removal rate more than 75%, and the color is reduced to...
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