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Method for utilizing sweet potato starch acid slurry wastewater to improve paddy soil and reduce heavy metal content of rice

A technology of sweet potato starch and heavy metals, which is applied in the agricultural field, can solve problems such as unreported and insurmountable impacts, and achieve the effects of simple and easy operation, shortening the improvement cycle, and inhibiting absorption

Inactive Publication Date: 2019-06-04
YANGXIAN COUNTY ZHUHUAN ORGANIC IND TECH CONSULTATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, 1 ton of starch produces 20-30 tons of waste water. The main components of waste water are organic matter such as lactic acid, protein, colloid, soluble sugar, and microorganisms such as lactic acid bacteria and yeast. The pH value is below 4.0. Due to the current technical conditions, the commonly used methods are: Physicochemical pretreatment technology and biochemistry, neutralization-anaerobic biological treatment (UASB)-aerobic biological treatment (SBR), two-phase anaerobic + aerobic combined process, absorption biodegradation method (AB method), sequencing batch method Activated sludge method (SBR), etc., but the sweet potato starch wastewater is regarded as a kind of resource, and the development and utilization have not yet been reported.
[0008] From the above literature, it is known that adding regulatory substances to the soil to change the chemical activity of heavy metals can inhibit the absorption of heavy metals by rice, but the above studies mainly focus on single elements, and the method is too acidic or alkaline for rice growth. The impact caused by the environment is also insurmountable; how to assemble and use regulatory substances to improve the growth environment of rice and achieve the purpose of reducing heavy metal content in rice is still a technical problem that needs to be solved urgently.

Method used

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  • Method for utilizing sweet potato starch acid slurry wastewater to improve paddy soil and reduce heavy metal content of rice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: utilize sweet potato starch Physalis wastewater to improve paddy field soil and reduce the method for rice heavy metal content, be in the following specific implementation steps:

[0020] (1) Wastewater improvement of soil: implemented in areas with heavy metal pollution in soil (arsenic 26.2mg / kg, cadmium 0.75mg / kg, lead 169.1mg / kg, pH value 7.2), Physalis wastewater and irrigation during sweet potato processing Water, wherein the pH value of the Physalis wastewater is 3.0, the Physalis wastewater and irrigation water are mixed to obtain the first mixed water, and the pH of the first mixed water is controlled to be 5.0; according to the soil pH range, the mixed water is used for the first time. Fill the soil once with water to adjust the pH of the soil to 6.0, let the water layer dry naturally, then put in organic fertilizer after 10 days of simmering, and then mix the soil and fertilizer evenly in the palladium field again to cultivate rice seedlings ....

Embodiment 2

[0023] Embodiment two: utilize sweet potato starch Physalis waste water to improve paddy field soil and reduce the method for rice heavy metal content, be in the following specific implementation steps:

[0024] (1) Wastewater improvement of soil: implement in areas polluted by heavy metals in soil (cadmium 0.75mg / kg, lead 169.1mg / kg, pH value 7.2), take physalis wastewater and irrigation water during sweet potato processing, of which physalis wastewater Physalis wastewater and irrigation water are mixed to obtain the first mixed water, and the pH of the first mixed water is controlled to be 5.5; according to the soil pH range, the mixed water is used to fill the soil once for the first time , so that the pH of the soil is adjusted to 6.9, let the water layer dry naturally, then put the organic fertilizer into the palladium field after 10 days of simmering, and then mix the soil and fertilizer evenly in the palladium field again to cultivate rice seedlings.

[0025] (2) Regula...

Embodiment 3

[0027] Embodiment three: utilize sweet potato starch Physalis waste water to improve paddy field soil and reduce the method for rice heavy metal content, be in the following specific implementation steps:

[0028] (1) Wastewater improvement of soil: implement in areas polluted by heavy metals in soil (cadmium 0.75mg / kg, lead 169.1mg / kg, pH value 7.2), take physalis wastewater and irrigation water during sweet potato processing, of which physalis wastewater Physalis wastewater and irrigation water are mixed to obtain the first mixed water, and the pH of the first mixed water is controlled to be 5.25; according to the soil pH range, the mixed water is used to fill the soil once for the first time , so that the pH of the soil is adjusted to 6.5, let the water layer dry naturally, then put in organic fertilizers in the palladium field after 10 days of simmering, and then mix the soil and fertilizer evenly in the palladium field again to cultivate rice seedlings.

[0029] (2) Regul...

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Abstract

The invention discloses a method for utilizing sweet potato starch acid slurry wastewater to improve paddy soil and reduce heavy metal content of rice, and belongs to the technical field of agriculture. The method is characterized in that the method includes steps of soil improving with wastewater, regular watering and paddy field management; and the method can adjust the pH values of paddy soil by acid slurry wastewater produced by sweet potato starch and improve the organic matters of soil, so that the activation of heavy metal in the soil can be inhibited, and the purpose of reducing the heavy metal content of rice can be achieved. The method can be used for paddy soil improvement and soil heavy metal pollution remediation technologies, and has advantages of being low in cost, simple inoperation, green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of agriculture, and in particular relates to a method for improving rice field soil and reducing rice heavy metal content by using sweet potato starch acid slurry wastewater. Background technique [0002] The heavy metals involved in environmental pollution mainly refer to mercury, cadmium, lead, chromium, and metalloid arsenic with significant biological toxicity, and also include toxic heavy metals such as zinc, copper, cobalt, nickel, tin, and vanadium. Once the environment is polluted by heavy metals, it is difficult to control. After entering the environment, heavy metals will accumulate and enrich in the biological chain, and can remain latent in the environment for a long time, and enter the human body along with the food chain, seriously endangering life and health. Therefore, in recent years, the remediation technology of heavy metal pollution has been a research hotspot in the field of heavy metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02A01G22/22
Inventor 催译丹周子恒王艳龙赵益萌周佳周宝龙王昌纬周艳平
Owner YANGXIAN COUNTY ZHUHUAN ORGANIC IND TECH CONSULTATION CO LTD
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