A method for controlling heavy metals in river sludge

A heavy metal and sludge technology, which is applied in the direction of sludge treatment, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of strict growth environment requirements, high cost, and short stabilization time, so as to prevent secondary pollution and improve Effect of specific surface area and improvement of adsorption rate

Active Publication Date: 2021-05-28
YIKANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nowadays, most of the heavy metals in the sediment are removed or fixed by cement-fly ash to stabilize and fix the heavy metals in the sediment. This is an important method that is widely used. However, the fixation of cement and other curing agents will cause the sludge to not flow and cannot play a role. Sludge action, and it is not easy to remove; or use dredging and other methods to filter out the sludge, this method requires a large amount of engineering, high cost and easy to damage the river bed; there is also a large amount of chemicals directly sprinkled into the river, but the stabilization time is short and the cost High potential for secondary pollution; or use biological methods to cultivate plants or microorganisms to treat heavy metals in river sludge, but plants or microorganisms have strict requirements on the growth environment, and it is difficult to adjust the growth curve. Sludge heavy metals approach critical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for combined treatment of river sludge heavy metals, comprising the following steps:

[0026] (1) Mix peanut shells and straw at a ratio of 1:1, soak in river water at a temperature of 25°C, and an oscillation speed of 20 r min -1 , sealed and shaken for 30 days; filtered, dried, and ground to obtain a mixed residue.

[0027] (2) Take 50g of clay minerals passed through a 100-mesh sieve and 150ml of 0.1mol / L HCl in a 500ml volumetric flask, so that the hydrochloric acid and the mixed residue can be fully mixed, sealed and shaken for 30min, centrifugally dried and ground; take 3ml Chlorosulfonic acid was dropped into 5ml of chloroform at a constant pressure, and then 1g of the above-mentioned clay mineral was added thereto, stirred on a constant magnetic stirrer for 2h at a temperature of 30°C, and subjected to sulfonation modification treatment; the filtrate was removed, and Washing with ionic water three times, drying, and grinding to obtain modified clay min...

Embodiment 2

[0035] Take by weight the modified clay mineral that is 20 parts by weight, the modified fly ash of 50 parts by weight, the modified residue of 20 parts by weight, and the cross-linking agent of 10 parts by weight and fully mix with a ball mill to obtain river sludge Heavy metal adsorbent pellets;

[0036] Take 1g of adsorbent pellets and add them to 10ml of 100mg / L Cd, Cu, Cr, Pb contamination solution respectively, 100r min -1 Rotate for 2 hours, filter, and measure the concentration of heavy metals in the contaminated solution after adsorption. The removal rates of Cd, Cu, Cr, and Pb are 88.6%, 80.3%, 60.1%, and 75.4%, respectively.

Embodiment 3

[0038] Take by weight the modified clay mineral that is 25 parts by weight, the modified fly ash of 40 parts by weight, the modified residue of 25 parts by weight, and the cross-linking agent of 10 parts by weight and utilize ball mill to fully mix to make river sludge Heavy metal adsorbent pellets;

[0039] Take 1g of adsorbent pellets and add them to 10ml of 100mg / L Cd, Cu, Cr, Pb contaminated solution respectively, 100r min -1 Rotate for 2 hours, filter, and measure the heavy metal concentration of the contaminated solution after adsorption. The removal rates of Cd, Cu, Cr, and Pb are 92.1%, 86.7%, 90.5%, and 88.9%, respectively.

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Abstract

The invention relates to a method for controlling heavy metals in river sludge. The method comprises the following steps: adding adsorbent pellets to the heavy metal-containing sludge, shaking for 2-6 hours, and centrifuging to obtain a treated product. The preparation of the adsorbent pellets comprises: pulverizing and mixing peanut shells and corn stalks, soaking them in river water, sealing and shaking for 30 days; filtering, drying, and grinding to obtain mixed residues; mixing modified mixed residues, modified Clay minerals, modified fly ash and cross-linking agent are mixed and dried to obtain adsorbent pellets. This method avoids the secondary pollution of heavy metals in the river sludge to the environment, and the method has a high removal rate of heavy metals, the material is environmentally friendly, the engineering amount is small, the cost is low, the recycling of solid waste can be realized, and the black and odor of the river can also be suppressed. The water body is generated, and the adsorbent pellets can achieve the purpose of secondary utilization.

Description

technical field [0001] The invention belongs to the field of river pollution control in environmental protection, and relates to a method for treating heavy metals in river sludge. Background technique [0002] At present, with the rapid economic development and population growth year by year, urban river pollution is gradually increasing. Among them, heavy metals are non-biodegradable and easy to bioaccumulate, and eventually affect the top organisms or humans in the "food chain". Therefore, the effective separation of heavy metals in sediment and their fixation or stabilization have become the key issues for the massive reuse of sediment. [0003] Nowadays, most of the heavy metals in the sediment are removed or fixed by cement-fly ash to stabilize and fix the heavy metals in the sediment. This is an important method that is widely used. However, the fixation of cement and other curing agents will cause the sludge to not flow and cannot play a role. Sludge action, and it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00B01J20/24B01J20/28B01J20/30C02F101/20C02F101/30C02F103/00
CPCB01J20/103B01J20/24B01J20/28019C02F11/00C02F2101/20C02F2101/30C02F2103/007
Inventor 曲毅郝进伟丁宇张华巍王兆选张培杨谢辉杨宏旺徐慧荟刘雪曹贻社常安盖君朋贾宁金田宗康琦李鹏梁春花柳晓明马吉飞牟玉明裴俊玲任国杰宋晓琳孙国剑王翠辉吴晓峰夏鸿飞刘丽肖洪钢武伟于海深臧岐山张广为张来君赵伟龙李楠郑勇王昌启冯平
Owner YIKANG TECH CO LTD
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