A diatom-based porous ceramic used as a sludge biological drying conditioner and its preparation method

A porous ceramic and diatom-based technology, which is applied in the field of diatom-based porous ceramics and its preparation, can solve the problems of inability to heat up the pile, poor permeability of the pile, and low free air space, and achieve good chemical stability, High anti-friction ability, water content improvement effect

Active Publication Date: 2020-09-01
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, too high moisture will easily increase the difficulty of oxygen diffusion inside the pile, resulting in a local anaerobic environment, which will affect the release rate of aerobic microbial energy, and the specific heat capacity of water is large, and a large amount of water in the pile will absorb heat. The body does not heat up quickly and normally
At the same time, the wet bulk density of high-moisture material piles makes the piles easy to compact, and the porosity and free airspace are small
Free airspace too low, O 2 The diffusion and storage process of the heap is hindered, the heap presents an anaerobic environment, and the activity of aerobic microorganisms is inhibited, leading to anaerobic fermentation of the heap. With the reduction of free airspace, the permeability of the heap becomes poor, and the gas passes through the pressure of the heap. drop increases, resulting in an increase in energy consumption

Method used

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  • A diatom-based porous ceramic used as a sludge biological drying conditioner and its preparation method
  • A diatom-based porous ceramic used as a sludge biological drying conditioner and its preparation method
  • A diatom-based porous ceramic used as a sludge biological drying conditioner and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, preparation diatom-based porous ceramics

[0023] The main raw material diatomite used in the present invention is purchased from Zhedong diatomite fine product factory in Shengzhou City, Zhejiang Province, and glass powder is purchased from Huayi Mineral Products Processing Factory in Lingshou County. See the table below for sub-analysis (unit: w%):

[0024]

[0025] First, the raw materials with a particle size greater than 200 mesh are transported to a high-pressure suspension roller mill and ground to about 200 mesh. The mass ratio of diatomite to glass powder is 85:15, and the mass of added carbon powder accounts for the total of diatomite and glass powder. 40% of the mass. According to the above ratio (Formula C), the ingredients are sent to the double-cone high-efficiency mixer for mixing, and then enter the drum-type ball forming machine to form a spherical or ellipsoid green body with a diameter of about 2cm, and place it in a ventilated open ...

Embodiment 2

[0032] Embodiment 2, the application example of diatom-based porous ceramics

[0033]The dewatered sludge with a moisture content of 84.1% was mixed with the diatom-based porous ceramic prepared in Example 1 at a mass ratio of 7:3, and the biological drying experiment was carried out in a static batch sludge biological drying reaction system with a reactor volume of about 160L , 1m high, 0.45m inner diameter. The air required in the reaction process is supplied by an air compressor, and six temperature sensors with a length of 20mm are laid on the upper, middle and lower symmetrical positions on both sides of the cylinder, which are used to monitor the temperature change in the reactor online. During the drying process, the system starts up and heats up very quickly. The temperature of the material can be close to 50°C at the 29th hour. At the 41st hour, it reaches the highest temperature of 58.2°C. The heating rate reaches 25°C / d. The moisture removal of the porous ceramic st...

Embodiment 3

[0034] Embodiment 3, the application example of diatom-based porous ceramics

[0035] The dewatered sludge with a moisture content of 84.1% was mixed with the diatom-based porous ceramics prepared in Example 1 at a mass ratio of 5:3, and the biological drying experiment was carried out in the drum sludge biological drying reaction system. The volume of the drum section reactor was 3000L It is 1m long and has an inner diameter of 2m. The inner wall surface is covered with small holes with a diameter of 3mm and a spacing of 5cm for uniform air distribution. The space between the inner and outer walls is evenly divided into 6 parts by the partition, and each part is inserted with an intake branch pipe, a suction branch pipe and a drain pipe, and is connected with the position sensor, and the drain pipe is close to the partition for discharge Condensation water entering between the two walls. When the drum rolls to the proper position, the intake and exhaust valves are automatica...

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Abstract

The invention describes a diatom-based porous ceramic for a biological drying conditioner for sludge and a preparation method of the diatom-based porous ceramic. The preparation method of the diatom-based porous ceramic comprises the following steps: taking diatomite, glass powder and carbon powder as raw materials, mixing the diatomite, the glass powder and the carbon powder according to the accurate ratio and then sintering and forming. The obtained finished product has abundant capillary pore structures, the saturated water absorptivity reaches 99.00%, the porosity reaches 70.72%, the volume density reaches 0.715 g / cm<3>, and the compressive strength reaches 3.43 MPa. The surface of the obtained finished product is a porous vitrification layer, the inside of the finished product has a net-shaped capillary pore structure, and the strength and wear resistance of the finished product are good. In the biological drying process of the sludge, the conditioner is combined to the sludge well, particles are easily formed in a composting process, the heating speed of the system is high, the breakage rate at a single time of the conditioner is smaller than 1%, and the conditioner is easy to screen and can be recycled.

Description

technical field [0001] The invention relates to a diatom-based porous ceramic used as a sludge biological drying conditioner and a preparation method thereof. Background technique [0002] At present, my country's sludge treatment and disposal technologies mainly include land use, landfill, and incineration. Land use is a typical way of recycling sludge. Its rich nitrogen, phosphorus, potassium and organic matter can increase soil fertility and promote the growth of crops. However, heavy metals and pathogens contained in untreated sludge are easy to And crops cause secondary pollution, and finally enter the human body through the food chain, there is a great potential safety hazard. Landfill is a well-developed disposal technology in the world. It has the characteristics of low investment, large capacity and quick effect. However, sludge landfill has great limitations due to the special properties of sludge. Dewatered sludge with a moisture content of 80% is bulky, has hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/14
CPCC04B35/14C04B38/08C04B2235/36C04B2235/422C04B2235/77C04B2235/96C04B38/0074C04B38/0067
Inventor 王洪涛杜琼洪庆洋陈坦刘彦廷陆文静
Owner TSINGHUA UNIV
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