A kind of sludge soil conditioner and its preparation method and device

Abstract

The invention provides a sludge soil conditioner and a preparation method and application thereof, belonging to the technical field of sludge treatment. The preparation method of the sludge soil conditioner comprises the following steps: pre-dehydrating sludge to obtain first sludge; carrying out thermal hydrolysis reaction on the first sludge to obtain second sludge; sequentially carrying out filter pressing dehydration, crushing and drying on the second sludge to obtain sludge particles; mixing the sludge particles and biomass auxiliary materials, and performing pyrolysis reaction to obtainthe sludge soil conditioner. The preparation method meets the principles of reduction, harmlessness, stabilization and resource utilization, and has low cost and high efficiency. By adding the biomassauxiliary materials, the content of organic matters in the material is increased, a large amount of pyrolysis gas can be generated, the self-balance of system heat is realized, the dependence on an external fuel is reduced, and the operation cost is greatly reduced; the carbon content in solid carbon slag is improved, and the requirement of the soil conditioner for forestry is met.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge soil conditioner and a preparation method and device thereof. Background technique [0002] With the development of our country's social economy, the requirements for environmental protection are increasing day by day, the scale of urban sewage treatment is expanding rapidly, and the treatment standards are becoming increasingly strict. How to dispose of a large amount of sludge generated by municipal sewage treatment plants every day has become a hot spot of common concern in the field of sewage treatment and solid waste. Sludge disposal is required to meet the four modernization principles of reduction, harmlessness, stabilization, and resource utilization. At present, the main disposal methods of municipal sewage plant sludge are sanitary landfill, anaerobic digestion, aerobic composting, incineration, and co-processing in cement kilns. [0003] Among them,...

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Problems solved by technology

[0003] Among them, the sanitary landfill technology is mature and the cost is low, but it cannot meet the four principles of sludge disposal, and it needs to occupy a large amount of land resources, and there is a risk of secondary pollution; the anaerobic digestion process technology is mature and meets the four principles of sludge disposal. However, it is more suitable for implementation in big cities, but it is very difficult to use this process route in small and medium-sized cities with relatively weak capital and technical capabilities, especially in towns; aerobic composting treatment Method Sludge composting has a high degree of resource utilization, but due to the large amount of heavy metals in the sludge, the compost products cannot be used in agriculture, which leads to the unfavorable compost market, and the compost covers a large area, produces odorous gases, and there is a risk of secondary pollution; sludge incineration can be achieved Sludge reduction and resource utilization, but the single incineration equipment has a large processing capacity, which is only suitable for the construction of sludge disposal centers in large and medium-sized cities. For sewage treatment plants in small and medium-sized cities and towns, no matter from one-time investment or operation Cost considerations are not suitable for incineration; cement kiln co-processing is a good method for sludge disposal, but only sewage plants with cement kilns nearby can choose this process route, and it cannot be widely promoted due to environmental restrictions

[0004] Therefore, the above-mentioned sludge treatment methods, except for sanitary landfill, can realize resource utilization, but the cost is high and the secondary pollution is serious. The utilization rate of slag is low or even the problem that carbon slag cannot be reused

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