Preparation Of Compound Inorganic Polymer Flocculant And Its Application In Micro-polluted Water Source

River and lake and groundwater are drinking water in many cities in China,39% of fresh water’ quality from 62 country’s major lake can not meet the normal drinking standards,micro-pollution statu has development trend.Flocculation process is the one of most common aspects in water treatment process.Flocculant is the water treatment chemical reagent used most widely.And set a variety of functions in one,research and development of excellent performance,good water treatment effect of multiple composite environmental treatment of water treatment has become a major and urgent project in the field of water treatment.In this paper,the composite flocculant of boron-containing poly-silicate metal salt was prepared by co-polymerization method.The flue gas was used to treat the water source in the south of MeiHu Lake,the new campus of Zhengzhou University.The preparation conditions and optimum treatment conditions of flocculant were discussed.And its flocculation performance and stability compared with the traditional flocculant.In this experiment,the optimum conditions were determined by single factor experiment and orthogonal experiment:(1)The optimum technological conditions of boron-containing poly-silicate aluminum flocculant were n(B)/n(Si)= 0.1,n(Al)/n(Si)= 2.0,n(Fe)/n(Si)= 0.2,pH = 3.0,polymerization time 130 minutes,ripening time 1day,dosage 10mL/L,200r/min for 2 minutes,slow stirring 60r/min for 12 minutes,standing for 15 min,and the turbidity was above 99% under the optimum conditions.(2)The optimum technological conditions were as follows: n(Zn)/n(Si)= 3,pH = 3.0,polymerization time 90 minutes,ripening time 1 day,n(B)/n(Si)= 0.15,n(Al)/n(Si)60r/min for 12 minutes,standing for 20 minutes,under the optimal conditions,the turbidity is more than 98%.(3)The boron-containing poly-silicate magnesia magnesium optimum conditions for the flocculant are n(B)/n(Si)= 0.15,n(Fe)/n(Si)= 1.5,n(Mg)/n(Si)= 1.5,pH = 3.5,40r/min for 12 minutes,standing subsidence for15 minutes,and the turbidity was up to 95% under the optimum conditions.(4)The optimum conditions were n(B)/n(Si)= 0.15,n(Zn)/n(Si)= 1.5,n(Mg)/n(Si)= 2,pH =3.0,150r/min for 2 minutes,slow stirring 40r/min for 12 minutes.200r/min standing for 15 minutes.The dosage was 10mL/L,boron-containing poly-silicate zinc-magnesium flocculation.The optimum conditions can only reach 80% of the turbidity.The results show that the performance of self-made boron-containing poly-silicate metal complex compound flocculant is better than that of traditional flocculant,and the performance of self-made boron-containing poly-silicate compound flocculant is better than that of traditional flocculant The At the same time,the stability and flocculation effect of the four new occupants were compared.The time of flocculant storage and the flocculation effect were considered.The boron-containing poly-silicate and aluminum flocculant was the best,and the storage time was the longest.High turbidity,storage for a month in addition to the turbidity can still be as high as 80% or more.If the preparation is done within a week after the use,boron-containing poly-silicate aluminum and boron poly-silicate aluminum zinc flocculant regardless of secondary.The stability of boron-containing poly-silicon and magnesium is slightly worse than that of the first two,and the turbidity difference is less than 10%.Boron-containing poly-silicate zinc-magnesium flocculant is the most stable and unsuitable for preparation.