How to solve the problem of wastewater hardness in soybean oil refining zero discharge wastewater eq

How to solve the problem of wastewater hardness in soybean oil refining zero discharge wastewater equipment

by:Ocpuritech     2021-05-04
How to solve the problem of soybean oil refining waste water hardness device zero wastewater author of the article: Soybean oil refining waste water hardness as an important indicator of wastewater treatment scheme, affecting the rationality of the design scheme of the wastewater treatment process, how to control waste water hardness index is essential, The Environmental Protection Wastewater Zero Discharge Company will tell you how to solve the problem of wastewater hardness in the soybean oil refining zero discharge wastewater equipment. The hardness index of soybean oil refinery zero-discharge wastewater equipment is generally total hardness, which refers to the total amount of calcium and magnesium ions in the wastewater in the form of ions, usually converted to the amount of calcium carbonate. When the wastewater containing hardness enters the membrane filtration device, due to the stirring reaction, aeration reaction and the addition of sulfate during the pretreatment process, precipitated particulate solid scale such as calcium carbonate, magnesium carbonate or calcium sulfate will inevitably be formed, thereby preventing The membrane pores are blocked, which leads to a decrease in membrane water production. Due to the complex composition of this kind of hardness scale, it cannot be cleaned thoroughly by normal water washing. Corresponding acid washing is required, which leads to the increase of the operating agent cost of the membrane filtration device. At the same time, frequent acid washing will also lead to membrane materials. The wear and tear of the membrane will seriously reduce the service life of the membrane, so generally the waste water entering the membrane filtration device needs to reduce the hardness in advance or control the formation of scale. The current methods for controlling hardness include double-alkali method and ion exchange softening. Among them, ion-exchange softening has a relatively stable treatment effect, but requires frequent regeneration. It is not suitable for high-concentration and large-volume wastewater treatment systems. The double-alkali method is combined with tubular membrane filtration. The new softening process can stably reduce the hardness, and the effluent can directly enter the subsequent membrane filtration system. The method to control the formation of scale is to add scale inhibitor to the inlet water, which is suitable for wastewater with low hardness. At present, new technologies such as electronic water descalers can also control the formation of scale and are suitable for metal pipes. For the problem of wastewater hardness, it is necessary to consider the actual situation of wastewater, how to solve the problem of wastewater hardness in soybean oil refining zero-discharge wastewater equipment, and comprehensively consider suitable control methods and technologies.
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