Composite sludge conditioner based on iron-containing sludge pyrolysis residue as well as preparation and application of composite sludge conditioner

A conditioner and sludge technology, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problem of neglecting synergy, ineffective utilization of iron elements, and waste of resources and other problems to achieve the effect of convenient dehydration treatment

Active Publication Date: 2017-12-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For iron sludge pyrolysis residues with high iron content (iron content is 10% to 40%), this method cannot effectively utilize the abundant iron in the residue, and also ignores the synergistic effect of Fe and biochar on sludge conditioning , resulting in a waste of resources

Method used

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  • Composite sludge conditioner based on iron-containing sludge pyrolysis residue as well as preparation and application of composite sludge conditioner
  • Composite sludge conditioner based on iron-containing sludge pyrolysis residue as well as preparation and application of composite sludge conditioner
  • Composite sludge conditioner based on iron-containing sludge pyrolysis residue as well as preparation and application of composite sludge conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The preparation and application method of the sludge pyrolysis residue based on iron-containing sludge in this embodiment is carried out according to the following steps:

[0063] (1) Put 17kg of sludge into the sludge conditioning tank and add 128.2g of FeSO 4·7H 2 O to stir, the stirring speed is 150rpm, the stirring time is 5min, then add 104.9mL of 30% hydrogen peroxide for stirring, the stirring speed is 100rpm, the stirring time is 30min, so that the oxidation reagent and the sludge fully react, and finally add 166g red mud, and quickly stir for conditioning, the stirring speed is 150rpm, and the stirring time is 5min. Among them, the percentage content of iron in red mud is 26%, the mass percentage content of aluminum oxide is 18%, the mass percentage content of titanium oxide is 6%, and the content percentage content of silicon dioxide and other minerals is 50%. Finally, 17.4kg of conditioned sludge was obtained.

[0064] (2) Use a plate and frame filter pres...

Embodiment 2

[0070] The preparation and application method of the sludge pyrolysis residue based on iron-containing sludge in this embodiment is carried out according to the following steps:

[0071] (1) Add 17kg of sludge into the sludge conditioning tank, add 58.57g of FeCl 2 Stir, the stirring speed is 150rpm, the stirring time is 5min, then add 104.9mL hydrogen peroxide with a purity of 30% for stirring, the stirring speed is 100rpm, the stirring time is 30min, so that the oxidation reagent and the sludge fully react, and finally add 15g Quicklime, and fast stirring for conditioning, the stirring speed is 150rpm, the stirring time is 5min, and finally 17.3kg of conditioned sludge is obtained.

[0072] (2) Use a plate and frame filter press to dehydrate the conditioning sludge. First pump 17.3kg of conditioning sludge into a sludge feeding tank with a volume of 50L, and finally use an air compressor to pump the sludge in the feeding tank. The conditioned sludge is pressed into the diap...

Embodiment 3

[0077] The preparation and application method of the sludge pyrolysis residue based on iron-containing sludge in this embodiment is carried out according to the following steps:

[0078] (1) Add 15.4kg of sludge into the sludge conditioning tank, add 73.92g of FeCl 2 Stir, the stirring speed is 150rpm, the stirring time is 5min, then add 154.1mL of 30% hydrogen peroxide for stirring, the stirring speed is 100rpm, and the stirring time is 30min, so that the oxidation reagent and the sludge fully react, and finally 15.4kg of conditioned sludge.

[0079] (2) Use a plate and frame filter press to dehydrate the conditioning sludge. First pump 15.4kg of conditioning sludge into a sludge feeding tank with a volume of 50L, and finally use an air compressor to pump the sludge in the feeding tank. The conditioned sludge is pressed into the diaphragm plate frame for dehydration. The pressure of the air compressor is gradually increased from 0 to 0.8MPa every 1min, and kept for 25min. O...

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Abstract

The invention discloses a composite sludge conditioner based on iron-containing sludge pyrolysis residue as well as preparation and application of the composite sludge conditioner. The composite sludge conditioner contains the iron-containing sludge pyrolysis residue and an oxidant matched with the iron-containing sludge pyrolysis residue for use, wherein the iron-containing sludge pyrolysis residue is the pyrolysis residue prepared by the steps of dehydrating iron-containing sludge obtained from an advanced oxidation technique involved with an iron-containing element reagent so as to obtain an iron-containing mud cake, and carrying out pyrolysis on the iron-containing mud cake. Compared with the prior art, the composite sludge conditioner has the advantages that by utilizing an integral reutilization manner of a subsequent treatment processes of the mud cake of the iron-containing sludge and improving the specific reaction condition parameters in each subsequent treatment process step, the treatment problem of the mud cake at the tail end in an existing sludge treatment technique can be effectively solved, and the composite sludge conditioner formed by the mud cake of the iron-containing sludge for the deep dehydration of the sludge can be used as a sludge conditioner for circularly conditioning the sludge, so that the adequate utilization of resources can be realized.

Description

technical field [0001] The invention belongs to the technical field of sewage sludge treatment, and more specifically relates to a sludge composite conditioner based on iron-containing sludge pyrolysis residue and its preparation and application. The sludge composite conditioner is based on iron-containing sludge thermal It can be used as an advanced oxidation composite conditioner for deep dehydration of sludge, and it is a resource reuse method for iron-containing sludge. Background technique [0002] The so-called sludge is a general term for various sediments and floating objects produced in different treatment processes in urban domestic and industrial sewage treatment. There are mainly various pathogens, oxygen-consuming pollutants, plant nutrients, toxic and carcinogenic pollutants, general organic substances, and inorganic pollutants such as acids, alkalis, and salts. Because sludge contains high organic matter, its strong hydrophilicity and large specific surface a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/14
CPCC02F11/00C02F11/06C02F11/14C02F2209/06C02F11/10C02F11/143C02F2209/02C02F2209/38C02F2305/023C02F2305/026Y02W10/40
Inventor 杨家宽陶爽奕梁莎肖可可虞文波裘晶晶甘泉关若楠侯慧杰刘冰川胡敬平
Owner HUAZHONG UNIV OF SCI & TECH
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