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

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...

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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

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