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Influence of the flocculating agent in sedimentation and performance of a non flocculent strain of Zymomonas mobilis in the etha
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It was shown that PVP behaved as a flocculating agent at lower concentrations, but behaved as a dispersing agent at higher concentrations, while SDS at any concentration behaved as a dispersing agent for kaolinite suspension.
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The quantities of flocculating agent employed were optimized with the aid of a patented, portable flocculation and dewatering apparatus.
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Fenugreek mucilage as a flocculating agent for sewage treatment
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The use of fenugreek mucilage, a natural polysaccharide and a direct food additive, as a flocculating agent for removal of suspended and dissolved solids from sewage effluent has been reported.
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| The 83 strains of microorganisms including molds, bacteria, yeast and actinomycetes, which were isolated from soil and active sludge were found to produce the substances which can flocculate kaolin clay. Among them, four strains with high flocculating activity was identified as Sporolactobacillus sp. (GC3), Arthrobacter sp. (SB6),Pseudomonas sp. (SB8) , Aeromonas sp. (GC24). Growth study in shaking flasks was conducted for obtaining high flocculant production. The highest level of flocculating substance accumulation... The 83 strains of microorganisms including molds, bacteria, yeast and actinomycetes, which were isolated from soil and active sludge were found to produce the substances which can flocculate kaolin clay. Among them, four strains with high flocculating activity was identified as Sporolactobacillus sp. (GC3), Arthrobacter sp. (SB6),Pseudomonas sp. (SB8) , Aeromonas sp. (GC24). Growth study in shaking flasks was conducted for obtaining high flocculant production. The highest level of flocculating substance accumulation (0. 5-0. 9g/L) were attained after 65h cultivation at 30℃ with initial medium pH 7.5-8. 5 and proper aeration. These bioflocculants were purified by ethanol precipitation, gel chromatography and dialysis. The isolated polymers possessed chemical characteristics of nucleoprotein (MF-3, MF-6, MF-8) and polyglucoprotein (MF-24). Their molecular weights were larger than 106 dalton and they have widely flocculating activity against both organic and inorganic materials. It was detected by experiments that neither of the four strains has plasmids. The pathogenicity of their cells and toxicity of the bioflocculants had also been studied. | 筛选到83株絮凝剂产生菌,其中絮凝活性最高的四株分属于芽孢乳杆菌属(Sporolactobacillus GC3)、节细菌属(Arthrobacter SB6)、假单胞菌属(Pseadomonas SB8)、气单胞菌属(Aeromonas GC24)。四株菌在生长过程中均可产生胞外絮凝物质,在最适培养条件下絮凝剂产量为0.5—0.9g/L。纯化后的四种絮凝剂中,三种为核蛋白,一种为糖蛋白,均为高分子量物质(MW>10~6)。四株菌均不含质粒。12—30g/L的絮凝剂在1小时内对所有供试材料均有较好的絮凝效果。动物急性毒性实验表明,20—70倍于使用浓度的絮凝剂对昆明鼠无毒。 | Taking GCI medium to culture and isolate three strains of high coagulation microbes which could produce bio-coagulants, from activated sludge of Qu-yang Sewage Treatment Plant and setting of Yu-jing Creek. Several kinds of polluted water such as kaolin suspension could be purified effectively by using these bio-coagulants. Coagulation could be apparently improved when using CaO as the coagulating-aid. It showed that excellent bio-coagulants could be produced when a 72 hours continued cultivation was performed.... Taking GCI medium to culture and isolate three strains of high coagulation microbes which could produce bio-coagulants, from activated sludge of Qu-yang Sewage Treatment Plant and setting of Yu-jing Creek. Several kinds of polluted water such as kaolin suspension could be purified effectively by using these bio-coagulants. Coagulation could be apparently improved when using CaO as the coagulating-aid. It showed that excellent bio-coagulants could be produced when a 72 hours continued cultivation was performed. On the process of bio-coagulants isolation, a proper centrifugal conditions should be adpoted, because too fast centrifugation may result obvious decrease in coagulating efficiencies. | 用GCI培养基从曲阳污水厂污泥和俞泾浦底泥中分离出3株产生高絮凝活性的微生物,所研制出的微生物絮凝剂,对高岭土悬浊液、土壤悬浊液和碱性染料废水均有良好的净化效果。在助凝作用上,CaO的效果明显优于CaCl_2。微生物絮凝剂(液体)适宜的投加量为1.0％,助凝剂CaO(1.0％浓度)投加量为2.0％。在研制微生物絮凝剂的过程中,适宜的摇瓶培养时间为72h,离心条件为中高速(5000,10000r/min)。离心速度太高、时间太长不仅造成离心设备投资和能耗的增加,而且会减少离心上清液中絮凝物质的含量,从而导致絮凝效果的降低。 | Microbes which can produce bio coagulants were isolated from activated sludge of the Quyang Wastewater Works and also from the settlings of the Yujing Creek.Several kinds of polluted waters such as kaolin suspension can be purified efficiently by the use of the bio coagulants produced in this research.Coagulation can be apparently improved when using calcium oxide as the coagulating aid. The excellent bio coagulants can be produced when a 72 hour's continued cultivation was performed.In the process of bio... Microbes which can produce bio coagulants were isolated from activated sludge of the Quyang Wastewater Works and also from the settlings of the Yujing Creek.Several kinds of polluted waters such as kaolin suspension can be purified efficiently by the use of the bio coagulants produced in this research.Coagulation can be apparently improved when using calcium oxide as the coagulating aid. The excellent bio coagulants can be produced when a 72 hour's continued cultivation was performed.In the process of bio coagulant's isolation,a proper centrifugal conditions was suggested because too strong centrifugation may result obvious decrease in the coagulating efficiencies. | 用ＧＣＩ培养基从曲阳污水厂污泥和俞泾浦底泥中分离出３株产生高絮凝活性的微生物，所研制出的微生物絮凝剂对高岭土悬浊液、土壤悬浊液和碱性染料废水均有良好的净化效果．在对微生物絮凝剂的助凝作用上，ＣａＯ的效果明显优于ＣａＣｌ２．微生物絮凝剂（液体）适宜的投加量为１．０％ ，相应的助凝剂ＣａＯ（１．０％ 浓度）适宜投加量为２．０％ ．在研制微生物絮凝剂的过程中，适宜的摇瓶培养时间为７２ｈ，絮凝剂分离时适宜的离心条件为中高速（５０００～１００００ｒ／ｍ ｉｎ）．离心速度太高、时间太长不仅造成离心设备投资和能耗的增加，而且会减少离心上清液中絮凝物质的含量，从而导致絮凝效果的降低 | | | | << 更多相关文摘 |
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