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Sludge drying method based on natural limestone

A technology for drying sludge and limestone, which is used in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of long sludge treatment time, high operating cost, low treatment scale, etc. Small footprint effect

Inactive Publication Date: 2015-09-23
何庆堃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have the problems of large floor area, high operating cost, and long treatment time per unit weight of sludge, resulting in low treatment scale.
The sludge disposal scale of traditional sludge drying technology is 300 tons / day, which requires an area of ​​100-200 mu, and the cost is about 120-160 yuan / ton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Select a natural limestone somewhere in Gansu. According to the mass percentage, its main components are as follows: CaO 55.65%, SiO2 15.48%, MgO7.39%, Al2O3 1.53%, Na2O 1.47%, K2O 0.31%. The limestone is crushed into an average The powder preparation with a particle size of 5 μm is called an activator.

[0026] 2. Transport the dehydrated sludge with a water content of 85% from the sewage treatment plant to the sludge storage tank. The sludge storage tank is a cylindrical silo, and there are hydraulically driven sludge carriages and screw conveyors at the bottom of the storage tank. Prevent sludge caking.

[0027] 3. The fly ash from thermal power plants or large energy-consuming enterprises is used as the original fly ash and transported to the original fly ash storage tank. The storage tank is a cylindrical silo with a screw conveyor at the bottom of the storage tank.

[0028] 4. Send the original fly ash in the original fly ash storage tank into the double-rolle...

Embodiment 2

[0033] 1. Select a natural limestone somewhere in Gansu. According to the mass percentage, its main components are as follows: CaO 46.81%, SiO2 10.48%, MgO 6.30%, Al2O3 1.73%, Na2O 2.47%, K2O 0.31%. Use a ball mill to crush the limestone to an average particle size The powder preparation of 5 μm is called the stimulator.

[0034] 2. Transport the dehydrated sludge with a water content of 85% from the sewage treatment plant to the sludge storage tank. The sludge storage tank is a cylindrical silo, and there are hydraulically driven sludge carriages and screw conveyors at the bottom of the storage tank. Prevent sludge caking.

[0035] 3. The fly ash from thermal power plants or large energy-consuming enterprises is used as the original fly ash and transported to the original fly ash storage tank. The storage tank is a cylindrical silo with a screw conveyor at the bottom of the storage tank.

[0036] 4. Send the original fly ash in the original fly ash storage tank into the doub...

Embodiment 3

[0041] 1. Select natural limestone somewhere in Gansu. According to the mass percentage, its main components are as follows: CaO 46.65%, SiO2 12.37%, MgO 7.88%, Al2O 35.73%, Na2O 6.47%, K2O 2.31%. The limestone is crushed into The powder preparation with an average particle size of 5 μm is called an activator.

[0042] 2. Transport the sludge with a water content of 80% after dehydration in the sewage treatment plant to the sludge storage tank. The sludge storage tank is a cylindrical silo, and there is a hydraulically driven sludge carriage and screw conveyor at the bottom of the storage tank. Prevent sludge caking.

[0043]3. The fly ash from thermal power plants or large energy-consuming enterprises is used as the original fly ash and transported to the original fly ash storage tank. The storage tank is a cylindrical silo with a screw conveyor at the bottom of the storage tank.

[0044] 4. Send the fly ash in the original state fly ash storage tank into the double-roller h...

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Abstract

The invention discloses a sludge drying method based on natural limestone. The sludge drying method comprises the following steps: selecting the following components in percentage by weight: 45-55% of CaO, 10-15% of SiO2, 6-8% of MgO and the balance of natural limestone as impurities and crushing the mixture to be powdery, wherein the average particle diameter of an exciting agent is 5 microns; feeding fly ash into a stirring tank, and adding the exciting agent for stirring for 1 min under the rotational speed of 24 revolutions per minute, wherein the mass ratio of the exciting agent to original state fly ash is (2-3): 100; feeding dehydrated sludge in a sewage treatment plant and a finished product of fly ash into another stirring tank to be stirred uniformly, wherein the mass ratio of the dehydrated sludge in the sewage treatment plant to the finished product of fly ash is (8-9): ( 2-1), and the moisture content of a finished product of sludge is 20-30%; leaving the stirred sludge to stand for 7 hours or above to obtain half-dry sludge; air-drying or oven-drying to obtain a finished product of dry and loose sludge.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for treating sludge from a sewage treatment plant by adding specific substances. Background technique [0002] The sewage treatment plant is the sewage (waste) water discharged from the pollution source. Due to the high total amount or concentration of pollutants, it cannot meet the requirements of the discharge standard or the environmental capacity requirements, thereby reducing the quality of the water environment and the functional goals. Places of artificial intensive treatment. It is generally divided into urban centralized sewage treatment plants and scattered sewage treatment plants of various pollution sources, which are discharged into water bodies or urban pipelines after treatment. Sometimes in order to recover and recycle waste water resources, when it is necessary to improve the quality of the treated effluent, it is necessary to build a sewage reuse or r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 何庆堃
Owner 何庆堃
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