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Method for treating sludge and sewage by using modified red mud and modified steel slag

A modification and red mud technology, applied in the treatment of sewage or sludge, and the field of wastewater, can solve the problems of difficult sludge treatment and low utilization rate, and achieve the effect of efficient co-processing and efficient recycling.

Active Publication Date: 2021-08-10
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of low utilization rate of red mud and steel slag waste and difficult sludge treatment in the prior art, the present invention provides a method for treating sludge sewage by utilizing modified red mud and modified steel slag. Modified pretreatment with steel slag, using modified red mud and modified steel slag to jointly adjust the dehydration performance of sludge and improve sludge dehydration rate; and combine the mud cake after sludge dehydration with modified red mud and modified steel slag Preparation of biochar-based iron-aluminum spinel, and use of biochar-based iron-aluminum spinel for sewage treatment

Method used

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  • Method for treating sludge and sewage by using modified red mud and modified steel slag
  • Method for treating sludge and sewage by using modified red mud and modified steel slag
  • Method for treating sludge and sewage by using modified red mud and modified steel slag

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Embodiment 1

[0050] This embodiment provides a method of using red mud and steel slag to condition sludge and prepare biochar-based iron-aluminum spinel to treat sewage, such as figure 1 As shown, the method specifically includes the following steps:

[0051] S1. Add 500 g of red mud to 1 L of salicylic acid solution with a concentration of 0.034 mol / L, and soak for 8 hours. Dry the soaked red mud at 60-80°C; take 500g of steel slag and add it to 1L of citric acid solution with a concentration of 0.034mol / L, and soak for 8 hours. Dry the soaked red mud at 60-80°C;

[0052] S2. The dried modified red mud and modified steel slag are sent to a ball mill at a mass ratio of 2:1 for mixed grinding, and the mixed grinding time is 1 hour. The mixed and ground sample was sieved through a 100-mesh sieve, and the treated mixed and ground sample was recorded as #1 mixed and ground sample. Add the above-mentioned mixed grinding sample #1 to the sludge with a moisture content of 95%, and the mass rat...

Embodiment 2

[0056] Steps S1-S2 of this example are the same as those in Example 1, except that the mass ratio of modified red mud and modified steel slag in step S2 is 1:1, and the obtained mixed grinding sample is recorded as #2 mixed grinding sample, The moisture content of the mud cake after dehydration was detected to be 53.17%. Scanning electron microscope was used to analyze the microscopic morphology of the sludge dewatered cake conditioned by #2 mixed grinding sample. The obtained SEM image is as follows figure 2 (c) shown. figure 2 The middle picture (a) is the untreated raw sludge, which was obtained by figure 2 It can be seen that figure 2 After the sludge in (b) and 2(c) is conditioned by modified red mud and modified steel slag, the floc structure of the original sludge is destroyed, forming a large particle structure, and some irregular block structures appear. Acting as a skeleton structure during the dehydration process, which is conducive to the removal of water; ...

Embodiment 3

[0060] The steps of this example are the same as those of Example 2, except that the percentage of the dry weight of the sludge to the mass of the mixture system in step S3 is 90%. The removal rate of pollutants such as image 3 shown.

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Abstract

The invention discloses a method for treating sludge and sewage by using modified red mud and modified steel slag. The method comprises the steps of performing modification pretreatment on red mud and steel slag, adding the red mud and the steel slag into sludge, performing dehydration treatment, drying a dehydrated mud cake, performing high-temperature pyrolysis treatment on the dried mud cake, the modified red mud and the modified steel slag, preparing biochar-based hercynite, and using the biochar-based hercynite to treat sewage. According to the invention, co-treatment of the steel slag, the red mud and the sludge and recycling of the final product are realized. The method has important significance in expanding the application and application range of wastes such as the steel slag, the red mud and the sludge and improving the recycling rate of iron and aluminum resources; and the method can be widely applied to the field of sewage treatment, and the dual effects of degrading novel pollutants and adsorbing heavy metals are realized. The method disclosed by the invention has the characteristics of simple production process, easily available raw materials, wide product application range, good economic benefit and social benefit and the like.

Description

technical field [0001] The invention belongs to the field of waste water, sewage or sludge treatment, in particular to the technology of using solid waste to treat sludge and sewage; in particular, it relates to using modified red mud and modified steel slag to adjust the dehydration performance of sludge, and using sludge mud cake, Modified red mud and modified steel slag are used as raw materials to prepare biochar-based iron-aluminum spinel for sewage treatment. Background technique [0002] Sludge is produced along with the sewage treatment process. With the deepening of our country's emphasis on sewage treatment, the popularization of the construction of urban sewage treatment plants and the continuous improvement of treatment technology, the efficiency of sewage treatment has been greatly improved, and the output of sludge has also increased. Rapid increase. Therefore, improving the dewatering performance of sludge and significantly reducing its water content is the p...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/22C02F101/34C02F101/36C02F101/38
CPCB01J20/20B01J20/0229B01J20/0248C02F1/281C02F2101/20C02F2101/22C02F2101/34C02F2101/38C02F2101/40C02F2101/36
Inventor 周显韩毅陈霞庞波娄宗斌万沙彭子凌范泽宇高卓凡吕兴栋高志杨郭文康李明霞
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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