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Method for activating water supply plant sludge-base haydite to enhance phosphorus adsorption effect

A technology for water supply plant sludge and water supply sludge, which is applied in the field of water treatment, can solve the problems of restricting the wide use of water supply plant sludge, low sludge doping amount, poor adsorption effect, etc. The effect of mud content and protection of cultivated land

Inactive Publication Date: 2017-05-31
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, sludge ceramsite has the defects of low doping amount of sludge in water supply plants and poor adsorption effect.
These shortcomings limit the widespread use of sludge from water supply plants. Therefore, the preparation of high-efficiency dephosphorization and water supply plant sludge ceramsite will become an inevitable trend of sludge resource utilization in the future.

Method used

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  • Method for activating water supply plant sludge-base haydite to enhance phosphorus adsorption effect
  • Method for activating water supply plant sludge-base haydite to enhance phosphorus adsorption effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for preparing ceramsite with waterworks sludge, the specific steps are as follows:

[0031] (1) Naturally dry the sludge from the water supply plant, crush it, and sieve it to make the particle size ≤ 125 μm;

[0032] (2) After mixing the sludge and clay from the water supply plant with a mass of 2:1, put them in the ball forming machine, set the speed of the ball machine to 40rpm, spray water with a mass of about 15% of the material mass, and granulate into balls;

[0033] (3) Sieve to obtain raw material balls with a particle size of 0.8mm ~ 1mm, dry them naturally, move them into a muffle furnace and preheat them at 400°C for 20 minutes, then raise the temperature to 900°C, roast them for 10 minutes, and cool down in the furnace to obtain the raw meal balls. Clay ceramsite.

[0034] The cylinder compressive strength of the ceramsite is 4.3MPa, and the specific surface area is 2.7m 2 / g.

Embodiment 2

[0036] The activation method for preparing ceramsite from waterworks sludge, the specific steps are as follows:

[0037] (1) Weigh 3 parts of 5g ceramsite, place them in 50mL HCl solution with a concentration of 0.5mol / L, 1mol / L, and 2mol / L respectively, and soak for 24h;

[0038] (2) Filter out the ceramsite, wash it with deionized water, and dry to obtain the activated water plant sludge ceramsite.

Embodiment 3

[0040] Determination of Phosphorus Adsorption Performance of Feedwater Sludge Ceramsite Before and After Activation

[0041] Prepare KH with an initial concentration of 50mg / L 2 PO 4 The solution simulates phosphorus-containing wastewater, adding the feedwater sludge ceramsite before and after activation prepared in Example 1-2, under the condition that the solid-to-liquid ratio is 1:100, vibrate at a speed of 100 rpm in a shaking incubator for 100 h, before and after activation The phosphorus removal effect of ceramsite is as figure 2 shown. It can be seen from the figure that the phosphorus removal effect of ceramsite after activation is significantly improved, and with the increase of hydrochloric acid concentration, the removal rate and adsorption capacity gradually increase. When the concentration of hydrochloric acid is 2mol / L, the removal rate of ceramsite to phosphorus in the solution is as high as 87%, and the adsorption capacity is 961mg / kg.

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Abstract

The invention belongs to the field of water treatment, and particularly relates to a method for activating water supply plant sludge-base haydite to enhance phosphorus adsorption effect. The method comprises the following steps: drying and crushing water supply plant sludge, uniformly mixing the sludge with clay, granulating in a granulator while spraying a proper amount of water, drying, carrying out high-temperature calcination to obtain haydite, soaking the haydite in hydrochloric acid for activation, cleaning and drying to obtain the activated sludge haydite. The activated sludge haydite has favorable phosphorus removal properties, and can be used as an adsorbing material for treating phosphorus-containing wastewater. The method solves the problem in water supply plant sludge treatment, saves the energy consumption for haydite production, and has favorable environmental and economic benefits.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for activating sludge-based ceramsite in a water supply plant and strengthening its phosphorus absorption effect. Background technique [0002] Phosphorus is a basic nutrient element for biological growth, but phosphorus content > 0.02mg / L will lead to eutrophication of water bodies and seriously damage aquatic ecosystems. At the same time, phosphorus is also a key factor affecting the eutrophication of water bodies in my country. Removing phosphorus in sewage to meet discharge standards is an effective means to delay water eutrophication. As a simple, efficient and rapid phosphorus removal technology, adsorption has attracted widespread attention. The key lies in finding efficient and cheap adsorption materials. Currently commonly used adsorption materials include activated alumina, activated carbon, zeolite, clay minerals and some industrial by-products....

Claims

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Application Information

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IPC IPC(8): C04B33/132C04B41/85B01D39/20C02F1/00C02F1/28B01J20/12B01J20/30
CPCB01D39/2075B01J20/12C02F1/001C02F1/281C04B33/1321C04B41/5016C04B41/85C04B2235/96Y02P40/60
Inventor 裴元生李秀青
Owner BEIJING NORMAL UNIVERSITY
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