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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...
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.
Based on the Mannich-Reaction, a new kind of chelating flocculant grafted with diethylene triamine has been prepared from polyacrylamide (PAM), formaldehyde and diethylene triamine (DETA). Using the prepared flocculant to remove Pb2+ from waste water was studied. Due to the introduction of chelated functional group grafted on the long chain of PAM, the as-obtained flocculant has possessed the multiple...
A new type of inorganic polymer flocculant, polysilicate boron ferric and zinc sulfate (PSBFZ), was prepared through reaction of sodium silicate, ferric sulfate, zinc sulfate and sodium tetraborate. The Optimal synthesis process and material mixture ratio were determined by Orthogonal and single-factor experiments. Experimental results demonstrated that the optimal preparation conditions were as follows:...
Washing coal usually brings about 0.2m3/t wastewater (in terms of closed circulation) due to transpiration, which provides an effective space for the recycle of coke-plant wastewater. The effluent from phenol-cyanogen wastewater biochemical disposal station is used as complementary water for washing coal, and Closed-Cycling System in coal preparation plant is introduced to make industrial experiment...
As we known, now wastewater from papermaking has been the main source of water pollution in China. Polyacrylamide is one of water treatment chemicals which have been used widely. In laboratory, we prepared a novel cationic polyacrylamide (CPAM) with acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride through dispersion polymerization in aqueous solution of ammonium sulfate. Cationic polyacrylamide...
A new-type composite flocculant, Polysilicate Aluminum Ferric-Chitosan (PSAF-CTS), was prepared using polysilicate aluminum ferric (PSAF) and Chitosan(CTS). The performance of PSAF-CTS was analyzed by testing turbidity and chrominance of papermaking wastewater, as well as removal efficiency of Cu2+, Ni2+, Zn2+, Cd2+, Cr6+ of heavy-metal wastewater. The orthogonal experiments showed that the optimal...
A novel bioflocculant-producing bacterial strain B-28 was screened from contaminative soils by gas oil wastewater. The optimum carbon sources, nitrogen sources, metal ions and initial pH were glucose, yeast extract, 2 ml 0.1% FeCl3 and 6-8, respectively. And at the optimal couture conditions, flocculating activity reached its maximum flocculating activity of 97.2% at 72 h. This indicated that the...
Starch wastewater has high turbidity and COD, heavy odor after anaerobic processing. Discharging this kind of sewage could cause serious environmental pollution, and therefore it need to be treated and reached the national standard before discharge. This experiment based on the specific characteristics of starch wastewater. The process was designed as follows: after anaerobic hydrolysis prior to degradation...
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...
At present, the neutralization and precipitation treatment is mostly applied in acid mine drainage treatment, which is widely used and with low running cost and so forth, but biggest problem is that the sediments float in the secondary settling tank and settle down difficultly, then the effluent always can't comply with the wastewater discharge standard. The acid mine drainage samples were from a...
A kind of aspergillus niger which was isolated from soil was inoculated with Czapek-Dox liquid medium. Controling the experimental conditions, microbial flocculant MF-1 was prepared. MF-1 was adopted for the treatment of midcourse wastewater in papermaking factory. The influence to the flocculation effect of the dosage of flocculant, addition of metal ions, temperature, pH value, and flocculant stirring...
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...
A bioflocculant-producing bacterium, named B-28, was isolated from contaminative soils by gas oil wastewater and identified as Bacillus sp. according to its morphological, physiological, biochemical properties and the analysis of its 16S rDNA gene sequence. The effects of bioflocculant dosage on flocculating activity in kaolin suspension showed that more than 80% of flocculant activity was observed...
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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