The method of cleaning a conveyor-washing water from the sugar beet plant
(57) Abstract:The invention relates to food industry, and in particular to methods of cleaning conveyor-washing water received in the processing of beet. For implementing the method of the filtration residue is treated with hydrolyzed polyacrylonitrile in the amount of 0.3-0.5% by its mass, activate lime milk in a quantity of 0.8-1.1% of CaO to the mass of the precipitate, and then bring it to aim at the clarification of the conveyor-washing water in an amount of 0.4-0.5% by weight for sugar beet, the clarified water is sent for reuse, and the thickened sludge in the blade. The method provides faster lightening while reducing fresh water consumption, wastewater and lime milk. table 1. The invention relates to the sugar industry, and in particular to methods of cleaning conveyor-washing water.A known method of cleaning a conveyor-washing water (see Chekurda A. F., Parkhomes A. P. study of the processes of clarification conveyor-washing water received in the processing of beet harvested by combines with a minimum expenditure of manual labor. /Proc. VNIIPO - 1968, S. 231 - 247), including processing them with the milk of lime in the amount of 1,5 - SJ insufficient degree of purification and high consumption of milk of lime.A known method of cleaning a conveyor-washing water, including the processing of their filtering the precipitate of the first carbonated juice instead of lime milk (see Khodursky E. A. Application for cleaning conveyor-washing and Laverne water as a coagulant filtration of sediment. // Sugar industry. 1987, No. 7, S. 37 - 38).A disadvantage of the known method are the high consumption of fresh water, wastewater, and insufficient cleaning of the conveyor-washing water.Object of the invention is the process of acceleration of lightening while reducing fresh water consumption, waste water and milk of lime.The problem is solved in that the filter cake is treated with hydrolyzed polyacrylonitrile in the amount of 0.3 - 0.5% by its mass, activate lime milk in a quantity of 0.8 - 1.1% of CaO by weight, sediment, and then bring it to aim at the clarification of the conveyor-washing water in an amount of 0.4 - 0.5% by weight for sugar beet, the clarified water is sent for reuse, and the thickened sludge in the dump.When processing the filtration of sediment polyacrylonitrile due to the interaction of these molecules with ions of calcium and aay - Deryagina (see Yu, Frolov. The course of colloid chemistry. Moscow, "Chemistry", 1982. S. 234-239) leads to rapid coagulation of colloids.Hydrolyzed polyacrylonitrile obtained by polymerization for 2 hours in the aquatic environment nitrolicious acid at 75 - 78oWith subsequent saponification for 1.5 - 2 h at 95 - 98o(See A. C. 848479 of the USSR, M. CL C 13 D 3/00. Way of clarification of sugar-containing solution. /I. A. Oleinik, I., Bagel, E. N. Wide and other (USSR), BI N 27,1981, S. 5).Hydrolyzed polyacrylonitrile, used for cleaning the first carbonated juice of the sugar-beet plant, removed with filtration of the precipitate and can be re-used as a coagulant for purification of the conveyor-washing water.It should be noted that obtaining a hydrolyzed polyacrylonitrile may exercise any of the sugar-beet plant of the waste light industry - fiber Nitron.The method is as follows.Contaminated conveyor-washing water is mixed in the sludge filtration sediment in the amount of 0.4 - 0.5% of its weight, processed hydrolyzed polyacrylonitrile in a quantity of 0.8 - 1.1% of its weight of lime and activated the Ali osvetleniyu conveyor-washing water, mixed with 0.5% by its weight filtration of sediment juice 1 saturation sugar beet plant, and defended within one hour. In the clarified and source water was determined by the amount of suspended solids, the amount of sludge and its moisture content by drying method.The results are presented in the table (see the end of the description).Example 2.Experiments 2 to 14 were carried out in the same conditions as in example 1, but unclarified conveyor-washing water was mixed with different amounts of filtration sludge-treated polyacrylonitrile and activated lime milk in different proportions.The presented results show that the moisture content of the sediment obtained by the claimed method was 82.3%, while known, 90.7 percent. The amount of water for the removal of this sediment by contamination beet 10% will be claimed method 82,310/100-82,3= 46,5% of the weight of the beet, and known - 97.5% by weight of beet, that is almost two times more. Significantly reduced content of suspended solids in clarified by the claimed method the water, and the amount of sediment.Are optimal amount of sediment filtration of 0.4 - 0.5% by weight of water, polyacrylonitrile 0.3 to 0.5%, and lime milk 0,8 - 1,1% of the weight of sediment (experiments 3, 4, effect (experiments 2, 7, 10), and the increase does not lead to a further increase in the effect, therefore, is not economically advisable.The originality of this invention is that with the introduction of the transport-washing water filtration sludge, treated hydrolyzed polyacrylonitrile, at the same time speeding up the process of clarification, is significantly reduced content of suspended solids in the clarified water, decreasing the amount of sludge. The method of cleaning a conveyor-washing water from the sugar beet plant, comprising processing filter sediment, lime milk and clarification by sedimentation, characterized in that the filter cake is treated with hydrolyzed polyacrylonitrile in the amount of 0.3 - 0.5% by its mass, after which it is introduced into directed to the clarification of the conveyor-washing water in an amount of 0.4 - 0.5% by weight of processed beets.
FIELD: devices for purification of household and industrial sewage.
SUBSTANCE: the invention is dealt with devices for purification of household and industrial sewage and intended for electrical and cavitational treatment of sewage containing a large quantity of organic compounds. The device for purification of sewage consists of a body made out of a dielectric material partitioned by diaphragms for two electrode chambers and one working chamber, that contains a filtering material. The electrode chambers have cavitational field sources installed and the working chamber is supplied with a the bubbler installed in it. The technical result consists in an increase of recuperation of the filtering material at the expense of application of a cavitational field to it, decrease of the microbiological semination, and an increase of cavitational effect on particles.
EFFECT: the invention ensures an increase of the filtering material recuperation, decreased microbiological semination and increased the cavitational effect on particles.