Heavy metal polluted bottom mud curing agent and curing method thereof

A technology of polluting sediment and heavy metal stabilizers, which is applied in the direction of chemical instruments and methods, sludge treatment, water pollutants, etc., can solve the problems of unfavorable resource utilization, secondary pollution, high pH value, etc., and is not easy to harden , a wide range of applications, the effect of increasing the unconfined compressive strength

Active Publication Date: 2020-09-11
HANGZHOU XINGYUAN FILTER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the bottom sludge solidified by this method, on the one hand, often has a high pH value of the solidified bottom sludge, which is not conducive to the utilization of resources; , in the process of subsequent utilization, as the environment changes, the heavy metals in the solidified sediment are easily re-dissolved and released, resulting in secondary pollution

Method used

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  • Heavy metal polluted bottom mud curing agent and curing method thereof
  • Heavy metal polluted bottom mud curing agent and curing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of modified chitosan: add chitosan to 0.1mol / L hydrochloric acid solution and soak for 1h, adjust pH to 4.5-5.5 with 1mol / L hydrochloric acid solution during soaking, and then dry at 105°C for 24h , and milled through a 100-mesh sieve to obtain modified chitosan.

[0029] Preparation of modified zeolite: Clean 15g of chabazite and place it in a muffle furnace, raise the temperature to 100°C for 1 hour, then raise the temperature to 300°C for 1 hour, and finally raise the temperature to 500°C for 2 hours, then cool down to At room temperature, take out and soak in 250ml of sodium hydroxide solution with a concentration of 1.5mol / L, heat in an oil bath at 95°C for 3h, shake for 10h, filter, wash the solid with deionized water until it is neutral, dry it, and dry it under a pressure of Under the condition of 15Pa and discharge power of 300W, the mixed gas obtained by mixing oxygen and nitrogen at a volume ratio of 1:2 was used as the working gas, and the modifi...

Embodiment 2

[0039] The preparation of modified chitosan is the same as in Example 1.

[0040] Preparation of modified zeolite: Clean 15g of chabazite and place it in a muffle furnace, raise the temperature to 100°C for 1 hour, then raise the temperature to 300°C for 1 hour, and finally raise the temperature to 500°C for 2 hours, then cool down to At room temperature, take out and soak in 250ml of sodium hydroxide solution with a concentration of 1.5mol / L, heat in an oil bath at 90°C for 3 hours, shake for 10 hours, filter, wash the solid with deionized water until it is neutral, dry it, and dry it under a pressure of Under the condition of 12Pa and discharge power of 250W, the mixed gas obtained by mixing oxygen and nitrogen at a volume ratio of 2:3 was used as the working gas, and the modified zeolite was obtained by low-temperature plasma treatment for 6 minutes.

[0041] Preparation of heavy metal stabilizer

[0042] S1: Weigh 2.5g of aminoundecanoic acid, add 40ml of water to dissolv...

Embodiment 3

[0051] The preparation of modified chitosan is the same as in Example 1.

[0052] Preparation of modified zeolite: Clean 15g of chabazite and place it in a muffle furnace, raise the temperature to 100°C for 1 hour, then raise the temperature to 300°C for 1 hour, and finally raise the temperature to 500°C for 2 hours, then cool down to At room temperature, take out and soak in 250ml of sodium hydroxide solution with a concentration of 1.5mol / L, heat in an oil bath at 95°C for 3h, shake for 10h, filter, wash the solid with deionized water until it is neutral, dry it, and dry it under a pressure of Under the conditions of 10Pa and discharge power of 280W, the mixed gas obtained by mixing oxygen and nitrogen at a volume ratio of 1:1 was used as the working gas, and the modified zeolite was obtained by low-temperature plasma treatment for 8 minutes.

[0053] Preparation of heavy metal stabilizer

[0054] S1: Weigh 2.0g of aminoundecanoic acid, add 40ml of water to dissolve, stir a...

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Abstract

The invention discloses a heavy metal polluted bottom mud curing agent and a curing method thereof, and relates to the technical field of bottom mud treatment. The heavy metal polluted bottom mud curing agent comprises curing powder and a curing liquid which are matched for use, the curing powder is prepared from, by weight, 25 to 35 parts of a heavy metal stabilizer, 1 to 5 parts of water glass,2 to 4 parts of modified chitosan, 1.5 to 2 parts of ammonium persulfate and 1 to 2 parts of polyaluminum chloride, and the curing liquid agent is prepared from, by weight, 10 to 15 parts of polyacrylamide, 5 to 10 parts of sodium polystyrene sulfonate and 0.5 to 1.5 parts of glutaraldehyde. According to the heavy metal polluted bottom mud curing agent and the curing method thereof, the cured bottom mud is slightly neutral, subsequent resource utilization is better facilitated, the stability of heavy metal in the bottom mud is good, the heavy metal in the bottom mud cured product is dissolvedand released again, and the probability of secondary pollution is relatively small.

Description

technical field [0001] The invention relates to the technical field of bottom sludge treatment, in particular to a heavy metal polluted bottom sludge solidification agent and a solidification method thereof. Background technique [0002] Heavy metals, especially lead and chromium, have significant biological toxicity, which can produce toxicity in trace concentrations, and will be transformed into more toxic organometallic compounds (such as cyano-methylmercury) under the action of microorganisms; they can be bioaccumulated, Enter the human body through the food chain, resulting in a chronic route. With the rapid development of industry and agriculture, a large amount of industrial and agricultural wastewater enters the river water body. When the industrial and agricultural wastewater carrying heavy metals enters the water body, since these heavy metals cannot be degraded by microorganisms in the water body, they can only undergo mutual transformation and In the process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/008C02F2101/20Y02W30/91
Inventor 许生军陈万苗李洁徐岗
Owner HANGZHOU XINGYUAN FILTER TECH
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