Method for recycling spent caustic liquid during chitin production process

A production process and waste lye technology, applied in the directions of chemical instruments and methods, applications, additional food elements, etc., can solve the problems of extensive waste lye water treatment methods, unsatisfactory discharge, and increase production costs, and achieve the goal of being conducive to resource utilization. The effect of utilization, high concentration ratio and lye cleaning

Active Publication Date: 2009-05-06
HAINAN ZHENGYE ZHONGNONG HIGH TECH
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Problems solved by technology

[0009] To sum up, the existing treatment methods of waste alkaline water in the production process of chitin are extensive, the treatment cost is high, the treatment is difficult, and the discharge after treatment cannot meet the standard. At the same time, it causes a lot of waste of resources and increases the production cost.

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  • Method for recycling spent caustic liquid during chitin production process

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Embodiment 1

[0025] Using the waste lye produced in the deproteinization process during the production of chitin as raw material, the mass concentration of sodium hydroxide in the waste lye is 1%-8%, the mass concentration of protein is 0.3%-5%, and the mass concentration of total solids is 2%. -12%. The waste caustic liquor is filtered through a 60-180 mesh security filter and then enters the stainless steel membrane element. The temperature of the feed liquid is 60-70°C, the operating pressure is 0.3-0.4MPa, the flow velocity on the membrane surface is 3-5.5m / s, and the average flux of the membrane is 300Lm -2 h -1 , end after 5 times of concentration. The filtrate is cooled to 50-55°C, pumped into the nanofiltration system, the operating pressure is 2.5-3MPa, the membrane surface flow rate is 2.2-3.0m / s, the concentration is 80 times, and the average flux of the membrane is 20Lm -2 h -1 . The total filtration yield is 94-96%, the amount of filtrate is 0.94 times of the original was...

Embodiment 2

[0028] The waste lye produced in the deproteinization process during the production of chitin is used as raw material, the mass concentration of sodium hydroxide in the waste lye is 1%-8%, the mass concentration of protein is 0.3%-5%, and the mass concentration of total solids is 2-5%. 12%. The waste lye is filtered through a 60-180 mesh security filter and enters the stainless steel membrane element. The temperature of the feed liquid is 80-90°C, the operating pressure is 0.7-0.8MPa, the membrane surface flow rate is 8-10m / s, and the average flux of the membrane is 600Lm -2 h -1 , end after 1-fold concentration. The filtrate is cooled to 50-60°C, pumped into the nanofiltration system, the operating pressure is 3-4MPa, the membrane surface flow rate is 8-10m / s, the concentration is 50 times, and the average flux of the membrane is 25Lm -2 h -1 . The total filtration yield is 94-96%, the amount of filtrate is 0.96 times of the original waste liquid, and the amount of concen...

Embodiment 3

[0031] The waste lye produced in the deproteinization process during the production of chitin is used as raw material, the mass concentration of sodium hydroxide in the waste lye is 1%-8%, the mass concentration of protein is 0.3%-5%, and the mass concentration of total solids is 2-5%. 12%. The spent caustic liquor is filtered through a 60-180 mesh security filter and then enters the stainless steel membrane element. The temperature of the feed liquid is 10-20°C, the operating pressure is 0.05-0.15MPa, the flow velocity on the membrane surface is 1-1.5m / s, and the average flux of the membrane is 10Lm -2 h -1 , end after 60 times of concentration. The filtrate is pumped into the nanofiltration system, the operating pressure is 0.1-0.2MPa, the membrane surface flow rate is 0.5-1.0m / s, the concentration is doubled, and the average flux of the membrane is 50Lm -2 h -1 . The total filtration yield is 50%, the amount of filtrate is 0.5 times of the original waste liquid, and th...

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Abstract

The invention discloses a method for recycling alkali waste liquid generated during the production of chitin and relates to the technical field of treatment and comprehensive use of wastewater generated during food processing. The method comprises the following steps: alkali waste liquid generated in a deproteinization process during the production of chitin is used as a raw material and subjected to stainless steel membrane filtration and nanofiltration to obtain clean alkali liquid to be reused; and concentrated solutions obtained after the stainless steel membrane filtration and nanofiltration are mixed, neutralized and subjected to spray drying and roller drying to obtain high-protein feed additives. Compared with the prior method for treating waste liquid, the method realizes recycling of alkali liquid, comprehensive use of active ingredients, and prevention of discharge of alkali liquid into environment, adopts a separation and purification process which is simple, reasonable, short in process, convenient in operation, high in yield and quality of alkali, and combines a stainless steel membrane filtration separation system and a nanofiltration separation system which have advantages of low operation cost, high filtration precision, high concentration factor, high concentration of the concentrated solutions and so on, contributes to production of high-protein feed additives through solidification of concentrated solutions and avoids secondary pollution.

Description

technical field [0001] The invention provides a method for recycling waste lye in the production process of chitin, and belongs to the technical field of waste water treatment and comprehensive utilization in food processing. Background technique [0002] Chitin is an important raw material in the pharmaceutical and food industries. In industry, the shells of crustaceans such as shrimp and crab are generally used as raw materials, and the raw material chitin is produced through biological or chemical methods of deproteinization and acid decalcification. In recent years, due to the large amount of waste water produced during its processing, its production has been restricted in many countries, the market supply has dropped sharply, the market is in short supply, and the price has gradually increased. At present, large-scale chitin processing plants mainly use the traditional acid-base process to produce chitin, which produces a large amount of waste water. Because the wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02A23K1/16A23K20/147
Inventor 夏文水赵黎明姜启兴
Owner HAINAN ZHENGYE ZHONGNONG HIGH TECH
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