Preparation method and application of coagulated sludge-based granular filler used for water treatment

A granular filler and water treatment technology, applied in the field of water treatment, can solve the problems of limited application, achieve strong cation exchange capacity, good removal effect, and low risk of leaching toxicity

Pending Publication Date: 2021-03-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used modified fillers are mainly biochar for adsorption and coagulation sludge, most of which are in powder form, and are easy to transfer in porous media under the action of rainwater leaching, which limits their application in water phase

Method used

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  • Preparation method and application of coagulated sludge-based granular filler used for water treatment
  • Preparation method and application of coagulated sludge-based granular filler used for water treatment
  • Preparation method and application of coagulated sludge-based granular filler used for water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dry the coagulation sludge, bentonite and corn cobs from the water purification plant at 60°C in an electric heating constant temperature blast drying oven, and grind all raw materials into powder with a grinder and pass through a 100-mesh sieve to obtain powdery raw materials, granules Diameter <0.15mm; the coagulation sludge comes from the surface water purification plant, and polyaluminum chloride (PAC) is used for coagulation treatment; bentonite is a conventional product of chemical plants, and there is no strict requirement on purity.

[0026] 2) uniformly mixing the coagulation sludge, bentonite and corncob powder after the treatment in step 1) according to the ratio of 3:2:1 by mass, adding an appropriate amount of water and stirring evenly to form a viscous mixture;

[0027] 3) preparing the viscous mixture prepared in step 2) into granules with a diameter of 5-6mm by rolling granulation to obtain a composite granule base;

[0028] 4) Drying the composite pa...

Embodiment 2

[0051] The difference between this example and Example 1 is that the mass ratio of coagulated sludge, bentonite and corn stalk powder is 6:3:1, and the granular filler is prepared by pressure granulation, and the remaining operation steps are the same as those in the example 1 is the same.

[0052] The strength of the granular filler obtained in this example is 0.43Mpa, and there is no risk of ecotoxicity. The static adsorption capacity of the granular filler for phosphorus is 11.49mg-P g -1 , the static adsorption capacity of the representative heavy metal lead is 11.87 mg g -1 .

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Abstract

The invention discloses a preparation method and application of a coagulated sludge-based granular filler used for water treatment, belonging to the technical field of water treatment. The invention provides the preparation method of the coagulated sludge-based granular filler which is used for water treatment, wide in raw material source, low in cost, good in adsorption and filtration effect andstable in property. According to the invention, coagulated sludge powder from a surface water purification plant or advanced sewage treatment plant, bentonite and plant-based biomass are used as raw materials and are mixed and granulated, and then pyrolysis is performed under an anaerobic condition to prepare the granular filler. After a bioretention pond or an ecological filter pond is filled with the filler, the anti-clogging performance of the filler is superior to the anti-clogging performance of powdery coagulation sludge, the filler has a good removal effect on pollutants under differentrainfall conditions, and the physicochemical property, leaching property and pollutant adsorption efficiency of the filler meet use requirements. Besides, the granular filler prepared by using the method uses the biomass and the binder which are high in yield and low in cost, and has the advantages of being simple in process and low in cost as the granular filler conducts treatment under medium and low temperature conditions.

Description

technical field [0001] The invention relates to a preparation method and application of a coagulated sludge-based granular filler for water treatment, belonging to the technical field of water treatment. Background technique [0002] Bioretention pond or ecological filter, as an important measure to control urban rainwater runoff from the source, has a good effect on controlling stormwater runoff pollution, reducing the volume of rainwater runoff and controlling the peak value of rainwater runoff. The removal of pollutants is mainly through plants and microorganisms. , Biological, chemical and physical effects of soil and filler. [0003] Fill layers for bioretention tanks range from sand to gravel and soil mixtures, biochar, wood chips, shale, zeolites, and other commercial products. However, due to the influence of the background value in the soil or filler and the root system of the plant, the removal effect of the bioretention tank on nitrogen and phosphorus fluctuates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
CPCC02F3/00
Inventor 王秀蘅王梦悦
Owner HARBIN INST OF TECH
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