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Fe3+ loading composite catalyst, preparation method of catalyst and dewatering pretreatment method for Fenton-like sludge

A composite catalyst, sludge dewatering technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. The effect of preventing precipitation

Active Publication Date: 2019-10-11
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a strong acid environment is required in the traditional Fenton reaction, the applicable range of pH is narrow, and Fe 2+ The addition of iron sludge is easy to produce and cannot be recycled, so the application of the traditional Fenton reaction is limited to a certain extent

Method used

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  • Fe3+ loading composite catalyst, preparation method of catalyst and dewatering pretreatment method for Fenton-like sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) a kind of Fe 3+ The preparation method of supported composite catalyst comprises the following steps:

[0045] Step 1: Sludge Pretreatment

[0046] The sludge is the remaining sludge with a water content of 80% obtained after being filtered by a plate and frame filter press, and then dried and ground, and passed through a 60-mesh sieve to obtain sludge particles;

[0047] Step 2:

[0048] The kaolin used in this embodiment is clay mineral; according to the mass ratio, sludge particles: kaolin = 5:1, the sludge particles are mixed with kaolin to obtain a mixture;

[0049] To the mixture, add FeCl with a substance concentration of 30mmol / L 3 solution, while adding EDTA-2Na with a mass of 0.5% of the sludge particles, stirring evenly, and granulating to prepare ceramsite with a diameter of 5mm; wherein, by volume ratio, the mixture: FeCl 3 Solution = 1:1.5;

[0050] Step 3: Drying and Calcination

[0051] Dry the prepared ceramsite. Then place it in an oven for ...

Embodiment 2

[0058] (1) a kind of Fe 3+ The preparation method of supported composite catalyst comprises the following steps:

[0059] Step 1: Sludge Pretreatment

[0060] Sludge is to remove Fe in embodiment 1 3+ The dewatered pretreated sludge loaded with composite catalyst, this sludge is passed through Fe 3+ Supported composite catalyst with H 2 o 2 After the composition of the Fenton-like reagent pretreatment, and then through the removal of Fe 3+ The composite catalyst is loaded and dehydrated by suction filtration, and the moisture content of the mud cake is 62.7%. After the sludge is dried and ground, it passes through a 60-mesh sieve to obtain sludge particles;

[0061] Step 2:

[0062] The attapulgite used in this example is a viscous mineral; according to the mass ratio, sludge particles:attapulgite=5:1, the sludge particles and attapulgite are mixed to obtain a mixture;

[0063] To the mixture, add FeCl with a substance concentration of 40mmol / L 3 solution, while addin...

Embodiment 3

[0071] With the Fe reclaimed in embodiment 1 3+ The loaded composite catalyst is reused, and it and H 2 o 2 Reagent formed Fe 3+ The method for the sludge dewatering pretreatment of the class Fenton reagent specifically comprises the following steps:

[0072] (1) Fe used in Example 1 3+ The loaded composite catalyst is separated from the sludge after dewatering pretreatment by filtration, washed and dried with deionized water, and sent to the next group of sludge dehydration pretreatment experiments (experimental conditions are the same as in Example 1);

[0073] (2) Add the recycled Fe to the test sludge 3+ supported composite catalyst, where H 2 o 2 (30%) The concentration of the substance whose dosage accounts for the volume of the wet sludge is still 90mmol / L, under the condition of the original pH (about 6.9) of the sludge, 40r / min is used for sludge pretreatment for 90min, and the dehydration pretreatment is obtained. sludge.

[0074] (3) Treatment effect: In the...

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Abstract

The invention discloses a Fe3+ loading composite catalyst, a preparation method of the catalyst and a dewatering pretreatment method for Fenton-like sludge, and belongs to the field of treatment of urban solid waste and resource utilization. Carriers of the Fe3+ loading composite catalyst are sludge particles and clay minerals, wherein the mass ratio of the sludge particles to the clay minerals is(3-5):1; the average loading amount of Fe3+ in the Fe3+ loading composite catalyst is 5-10 mmol / g. The preparation method of the catalyst comprises the steps that after the carriers are mixed, a FeCl3 solution is added, prilling and dry calcination are conducted, and the catalyst is prepared. Fe3+ in the Fe3+ loading composite catalyst replaces Fe2+, the Fe3+ and H2O2 are subjected to a Fenton-like reaction under the original sludge pH condition, and therefore the sludge is subjected to efficient and economical intensified sludge dewatering pretreatment. The Fe3+ loading composite catalyst can be recycled. According to the dewatering pretreatment method, the sludge can be quickly and efficiently dewatered, later treatment cost of the sludge is reduced, waste is treated by waste, and the economical efficiency and the effectiveness are achieved.

Description

technical field [0001] The invention belongs to the technical field of urban solid waste disposal and resource utilization, specifically a Fe 3+ Loaded composite catalyst, its preparation method and Fenton-like sludge dehydration pretreatment method. Background technique [0002] my country pays more and more attention to sewage treatment, and sewage treatment has reached a very high level, while the level of sludge treatment and disposal needs to be improved. At present, most urban sewage treatment plants use biochemical processes to treat sewage. In this process, a large amount of biochemical sludge will inevitably be produced. The sludge usually has complex components, large variability, and high moisture content (usually ≥99%). The water content of the concentrated sludge is still above 90%, and the volume is huge, which brings inconvenience to transportation, storage and use, and may cause secondary pollution to the environment. Therefore, sludge dehydration has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F11/143
CPCB01J23/745C02F11/143C02F2305/026
Inventor 徐文迪明铁山李艳李学田邵鸿媚张伟崔勇
Owner SHENYANG LIGONG UNIV
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