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Enhanced anaerobic remediation agent for chromium-contaminated sites, preparation method and use method

A repairing agent and chromium pollution technology, which is applied in the field of chromium pollution control, can solve the problems of less vegetable oil, sodium bicarbonate failure, and higher cost of chemicals, and achieve the effect of easy-to-obtain raw materials and strengthen anaerobic bioremediation

Active Publication Date: 2022-04-19
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few domestic studies on emulsified vegetable oil-enhanced microbial reduction of hexavalent chromium. Only Zhao Yongsheng et al. invented an in-situ repair agent using emulsified vegetable oil as a slow-release carbon source (application number CN201910681691.9); however, this More surfactants (Tween 80) and less vegetable oil are used in the preparation of patented emulsified vegetable oil, which leads to higher cost of medicine and limited long-term sustained release effect; at the same time, Tween 80 surfactant used in large quantities has potential toxicity; the The patent medicine uses ascorbic acid and sodium bicarbonate at the same time, and the two will react to produce carbon dioxide, which will cause ascorbic acid and part of the sodium bicarbonate in the medicine to fail

Method used

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  • Enhanced anaerobic remediation agent for chromium-contaminated sites, preparation method and use method
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  • Enhanced anaerobic remediation agent for chromium-contaminated sites, preparation method and use method

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preparation example Construction

[0051] The present invention also provides a preparation method of strengthening anaerobic restoration agent, comprising:

[0052] Step 1. Add emulsifier and glycerin to part of the water, heat and dissolve at 40-50°C, stir and mix to form solution A;

[0053] Step 2. Add lactate, lactic acid ester, vitamin B12, and diamine phosphate to the rest of the water, and stir and mix at room temperature to form solution B;

[0054] Step 3. Mix vegetable oil, solution A and solution B into a vacuum-sealed high-shear emulsification tank, start the equipment to stir and mix for 40-60 minutes, the stirring speed is 2000-3000 rpm, and stand for 20-40 minutes after stirring Discharging; Wherein, preferably stand still 30 minutes discharging.

[0055] The present invention provides a method for using an intensified anaerobic remediation agent, comprising:

[0056] Mix 6%-10% volume of enhanced anaerobic remediation agent with 90%-94% volume hydrogen-containing water and inject into soil or...

Embodiment 1

[0060] Mix 10 grams of sucrose, 1 gram of glycerin, and 15 grams of water at a temperature of 50°C to form solution A. Mix 1 gram of sodium lactate, 1 gram of ethyl lactate, 0.5 grams of vitamin B12, 0.5 grams of diamine phosphate, and 11 grams of water at room temperature Mix to form solution B; mix solution A, solution B, and 60 grams of soybean oil into a vacuum-sealed high-shear emulsification tank, start the equipment to stir and mix for 60 minutes, the stirring speed is 2000 rpm, and let stand for 30 minutes after the stirring is completed. , airtightly stored in a clean oil-free and water-free polypropylene plastic bottle for later use.

[0061] Carry out the following 2 sets of experiments:

[0062] Table 1 Experimental setup

[0063]

[0064] Group A: Put 100 ml of hexavalent chromium wastewater with a concentration of 20 mg / L in a 150 ml transparent plastic bottle, seal the transparent plastic bottle with a flip-top butyl rubber stopper in an infusion bottle, and...

Embodiment 2

[0071] The sucrose ester of embodiment 1 is replaced by monoglyceride, sodium lactate is replaced by potassium lactate, soybean oil is replaced by peanut oil; all the other are consistent with embodiment 1;

[0072] Sampling was carried out on day 1, day 5, day 10, day 20, and day 30 of the reaction. The contents of hexavalent chromium in the waste water of the two groups of experiments are shown in the table below.

[0073] Table 3 Hexavalent chromium content at different reaction times

[0074]

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Abstract

The invention discloses an enhanced anaerobic remediation agent for chromium-contaminated sites, a preparation method and a use method, wherein the enhanced anaerobic remediation agent includes: vegetable oil, emulsifier, glycerin, lactate, lactic acid ester, vitamin B12 , diamine phosphate and water; the preparation method includes: adding emulsifier and glycerin to part of the water, dissolving under heat to form solution A; adding lactate, lactate, vitamin B12, and diamine phosphate to the remaining part of water, and mixing to form solution B ;Stir and emulsify the vegetable oil, solution A and solution B, and let it stand for discharge; the method of use includes: mixing 6%-10% volume of enhanced anaerobic restoration agent with 90%-94% volume of hydrogen-containing water and injecting soil or groundwater. The restoration medicament of the present invention has the advantages of high efficiency, long sustained release time, environmental protection, easy-to-obtain materials and the like.

Description

technical field [0001] The invention relates to the technical field of chromium pollution control, in particular to an intensified anaerobic remediation agent for chromium-contaminated soil or groundwater, a preparation method and a use method. Background technique [0002] Hexavalent chromium is one of the most serious pollutants that endanger the health of residents. Its pollution sources mainly include: chromium salt chemical industry, tanning, and electroplating enterprises in the production process of leaking, leaking, excessive waste water discharge, chromium-containing waste residue and chromium-containing sludge. Unreasonable stacking, etc. [0003] Since Cr(VI) is the most toxic, about 100 times that of Cr(Ⅲ), the toxicity of Cr(Ⅲ) is relatively low; Cr(VI) has a strong migration ability, while Cr(Ⅲ) has a weak migration ability. At present, there are two main ways to deal with Cr(VI) pollution: (1) Remove Cr(VI) from the polluted medium. The commonly used removal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40C02F3/28C02F101/22C02F103/06
CPCB09C1/08B09C1/002C09K17/40C02F3/28B09C2101/00C02F2101/22C02F2103/06
Inventor 李淑彩魏丽方华祥任贝李来顺唐先进陈窈君
Owner BEIJING GEOENVIRON ENG & TECH