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A new type of effective coagulant Microbial Flocculants was prepared from A- spergillus oryzae and used as coagulant in the treatment of papermaking wastewater. The experimental results showed that it had a good coagulation effect in the treatment of papermaking wastewater in a wide range of pH value. The removal rate of SS and CODCr was 97% , 81 % respectively in the condition where temperature was...
The pulp & paper industry generates a considerable amount of wastewater in its manufacturing processes. Currently, the pulp and paper industry is facing more stringent standards for discharges of wastewater and associated permits. Biological processes such as activated sludge and aerated lagoons are conventionally used to treat pulp mill effluents. However, these processes have limited ability...
Phosphorus is often a limiting factor for the eutrophication of surface waters. An efficient removal of this constituent from the effluent of municipal wastewater treatment plants has been of growing interest. Alum salts (AlCl3, Al2(SO4)3) and iron salts (FeCl3, FeSO4) are the commonly used chemical coagulants for the removal of phosphorus. The aim of the present work was to evaluate the coagulation...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
In the experiment research on the fractal and sedimentation properties of the aggregates flocs, using an incorporate equipment that has the functions of coagulation, sedimentation and observation of the flocs, we obtained the fractal dimension and sedimentation rate of flocs formed in different flocculation conditions and analyzed the variation directions and reasons.
The removal of phosphate by KMnO4-Fe(II) process was investigated under different experimental conditions. The results showed that mix speeds and settling time had no significant effect on phosphate removal. The removal of phosphate was gradually increased with the increase of Fe dosages and decreased with the increase of pH. When the pH increased from 4 to 9, the removal of phosphate decreased from...
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...
Abstract-Chemithermomechanical pulping becomes an important development direction for pulp and papermaking industry. But the treatment of its effluent is very difficult because of its high concentration of organic pollutants and the deep color. In this study, eucalyptus chemithermomechanical pulp (CTMP) chemical pretreatment effluent was treated with electrocoagulation, and its treatment efficiency...
Coagulation process was applied to treat wastewater generated from the cleaning process of production and printing equipments of water-based printing ink under without pH adjustment. Polyaluminum chloride (PACl), aluminum sulfate (Al2(SO4)3) and ferrous sulfate (FeSO4) were used as coagulants, polyscrylamide (PAM) and FeSO4 were selected as coagulant aids. Coagulation efficiency was evaluated in terms...
Orthogonal experiment was designed to choose coagulant for treatment of regenerate paper industry wastewater. Polyaluminium chloride (PAC) was chosen based on the value of K, K mean, and R of each level of different factors, when taking supernatant liquid COD as an index for evaluating. Furthermore, the optimum coagulation condition was determined when the dosage was 1.24 g / L, and pH value was 7...
Chitosan can be a potential substitute for aluminum salts and synthetic polyelectrolytes in water treatment because it can: (1) avoid the health effects from residual aluminum (III) and synthetic polymers; (2) produce biodegradable sludge; and (3) reuse the crab shell. In this study, the chitosan flocculation characteristics in water were studied firstly, and then the combined flocculation of chitosan...
PBS (flyash-based coagulant) made by fly ash in coal-fired thermal power plants and blast furnace iron sludge extracted with a dilute H2SO4 was used as coagulant in the treatment of tanning wastewater. The influence of pH value, coagulant dosage and temperature on coagulation effect was investigated. The results showed that this coagulant had satisfactory results to treat tanning wastewater under...
Abstract-A new reagent is compounded by CaCl2 and MgSO4. It is determined through experiments that the proper mass ratio of CaCl2 and MgSO4 is 1:1. The optimum technical conditions which use CaCl2 and MgSO4 compound reagent to treat coal-washing wastewater are determined by the orthogonal experiment. The experimental results in laboratory are proved to be feasible through experiments in production...
A very effective combined process that included flocculation, oxidation, CRMO-coagulation and adsorption was studied in reactive dye wastewater treatment. The results showed that the total removal efficiencies of COD and colourity were 98.1% and 99.9% respectively. The process was characterized with operation flexibility and reliability and the equipment simplicity. It could widely be applied in reactive...
The effectiveness of coagulation/flocculation/ sedimentation (CFS), carbon adsorption, and CFS+carbon adsorption for advanced treatment of a biologically treated coking plant effluent was studied. The CFS treatment was cost effective for producing an effluent reusable as cooling water (CODCr<;100 mg/L). Carbon adsorption accomplished the same recycling treatment at a higher cost. Both carbon type...
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