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Heavy metals contamination and other physico-chemical changes in underground and surface water by acid mine drainage (AMD) were determined on the impact on creeks or streams. High levels of these metals have been reported in mining areas over the years; however, investigations indicates that less monitoring has been done on water discharged as effluent for effective maintenance mechanisms to be effected...
According to the characteristics of food additives wastewater with great variety of quality, complicated composition, the processes of hydrolysis acidification-contacting oxidation-catalytic ozonization-biological aerated filter(BAF) is applied. Through this processes, the COD of effluent can fall below 100 mg/L from about 2000 to 7000 mg/L of influent. The minimum COD of effluent is 33 mg/L. Quality...
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...
The oxidation of ammonia nitrogen at a low concentration in synthetic micro-polluted water by immobilized nitrobacteria pellets in inner-circulated biological fluidized bed reactor was investigated with the system operated continuously under the condition of temperature 20~30CC, DO 3~5 mg/L. The concentrations of effluent NH4+-N and NO2--N are below 0.3 mg/L at the influent concentration of 10~15...
Membrane-making wastewater contains DMF, with high COD, toxicity and non-biodegradability. In this work, aerobic Fe-C micro-electrolysis and three-dimensional electrodes technology were applied for the pretreatment aiming to improve the biodegradability of the wastewater. It was found that the optional pretreatment conditions were pH 3 for Fe-C micro-electrolysis and pH 5 for the three-dimensional...
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...
The inactivation of Copepod with available oxidants such as chlorine, chlorine dioxide, ozone and potassium permanganate were investigated under various working conditions of different oxidant dosage, organic substance content and pH value. The results showed that chlorine dioxide might be most effective to inactivate Copepod than other oxidants and complete inactivation effect may be attained by...
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