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A kind of high-efficiency and energy-saving whole-meter cycle cadmium removal method

An energy-saving and high-efficiency technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., which can solve the problems of arduous tasks, large water consumption, and inability to reuse water resources. , to achieve the effect of saving water for cadmium removal

Active Publication Date: 2022-03-29
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although soil remediation and sewage treatment can cure the root cause, the task is arduous and it is difficult to achieve results in the short term. However, the use of rice deep processing technology can effectively solve the urgent problem of excessive heavy metals in rice, although it does not cure the root cause, and has important application value. However, rice The cadmium removal technology mainly uses wet treatment under acidic conditions. Water becomes the key medium in the cadmium removal process. The large water consumption and the secondary pollution of cadmium-containing wastewater severely limit the industrial application of the existing rice cadmium removal technology.
In the prior art, the acidic cadmium-containing wastewater is usually solidified under neutral and weakly alkaline conditions, and it will be directly discharged as industrial wastewater after treatment, which cannot realize the reuse of water resources

Method used

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  • A kind of high-efficiency and energy-saving whole-meter cycle cadmium removal method
  • A kind of high-efficiency and energy-saving whole-meter cycle cadmium removal method
  • A kind of high-efficiency and energy-saving whole-meter cycle cadmium removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take the cadmium content of 0.251mg / kg cadmium-exceeding rice 1 and the cadmium content of 0.374 cadmium-exceeding rice 2 respectively, place them in the reaction tank for rinsing, add compound acid cadmium-removing agent according to the rice: cadmium-removing agent ratio of 1:2, and remove cadmium React for 2 hours. Wherein, the ratio of the cadmium removal agent is citric acid:hydrochloric acid:lactic acid=8:1:1, and the pH range of the cadmium removal agent is 1-3.

[0034] Add washing water equal in weight to the rice and wash it circularly for 30 minutes. Since rice has a water absorption capacity of about 30%, plus the water loss during the filtration process, 2 tons of cadmium removal agent can only recover about 1.3 tons, while the recovery rate of washing water is 85%. %, therefore, after cleaning, the cadmium removal agent and cleaning water are combined, about 2.15 tons, and 3.6% hydrochloric acid is used to adjust the pH range of the cadmium removal agent t...

Embodiment 2

[0043] (1) Take the rice with cadmium exceeding the standard, rinse it in the reaction tank, add the compound acid cadmium removal agent according to the rice: cadmium removal agent ratio of 1:2, and discharge it after 2 hours of cadmium removal reaction. Wherein, the ratio of the cadmium removal agent is citric acid:hydrochloric acid:lactic acid=8:1:1, and the pH range of the cadmium removal agent is 1-3.

[0044] (2) Add cleaning water equal to the weight of the rice and wash it circularly for 30 minutes. After the reaction, the cadmium removal agent and the cleaning water enter the tank together, and then use 3.6% hydrochloric acid to adjust the pH range of the cadmium removal agent to 1-3, which is the same for the second batch. The cadmium-exceeding rice is subjected to cadmium removal reaction. After 3 cycles, the cadmium removal agent is put into the cadmium curing tank, and rice protein and EDTA are added. The amount of rice protein added is 5g / L; the amount of EDTA add...

Embodiment 3

[0048] (1) Take rice with cadmium exceeding the standard, rinse it in the reaction tank, add compound acid cadmium removal agent according to the ratio of rice: cadmium removal agent 1:2, and react for 2 hours for cadmium removal. Wherein, the ratio of the cadmium removing agent is citric acid: hydrochloric acid: lactic acid = 7:2:1, and the pH range of the cadmium removing agent is 1-3.

[0049] (2) Add cleaning water equal to the weight of the rice and wash it circularly for 30 minutes. After the reaction, the cadmium removing agent and cleaning water enter the tank together, and then use 3.6% lactic acid to adjust the pH range of the cadmium removing agent to 1-3, and use the same for the second batch The cadmium-exceeding rice is subjected to cadmium removal reaction. After 3 cycles, the cadmium removal agent is put into the cadmium curing tank, and rice protein and EDTA are added. The amount of rice protein added is 5g / L; the amount of EDTA added is 15mg / L. 60min; after t...

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Abstract

The invention discloses a high-efficiency and energy-saving whole-rice circular cadmium removal method, which belongs to the technical fields of deep rice processing and food safety. The invention adopts the composite acid cadmium removal agent to remove cadmium from the whole meter, and solidifies the cadmium-containing cadmium removal agent under acidic conditions, so as to realize the repeated utilization of the cadmium removal agent. The invention can effectively reduce the cadmium content in the whole rice and the cadmium-removing agent, effectively save the cadmium-removing water, ensure the safety and health of the cadmium-removing process, effectively treat the cadmium-removing wastewater, and avoid secondary pollution. Among them, the compound acid cadmium removal agent after one cadmium removal still has a certain cadmium removal effect after adjusting the pH to 1-3, and the cadmium removal agent of the present invention can be recycled for 2 to 3 times, and then further recycled after being cured 1-2 times, the water consumption can be reduced from 3 tons of water / ton of rice to 1.4 tons of water / ton of rice.

Description

technical field [0001] The invention relates to a high-efficiency and energy-saving whole-rice circular cadmium removal method, which belongs to the technical fields of rice deep processing and food safety. Background technique [0002] With the continuous advancement of the domestic industrialization process and the continuous improvement of the regional industrialization level, the industrial application of heavy metals is accompanied by the wanton discharge of "three wastes", which in turn causes a series of environmental pollution problems, which are now spreading to the agricultural field and seriously threatening agricultural production. and human health, among which cadmium pollution is the most serious. Free cadmium has a strong ability to be absorbed by plants and is transferred to other different parts along with root and stem tissues, including the grain parts of crops such as rice, wheat, corn, etc., becoming a key way for cadmium to migrate to the food chain. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L5/20C02F9/04C02F103/32C02F101/20
Inventor 冯伟王韧陈正行朱伟邓波王涛李克强许亚丽
Owner JIANGNAN UNIV