Preparation method of sludge biomass fuel

Abstract

The invention discloses a preparation method of sludge biomass fuel, and belongs to the field of fuel preparation. The biomass fuel disclosed by the invention is prepared by the following steps: putting sludge into a treating pond, adding a sodium carbonate solution to mix, planting elodea nuttallii, and removing the elodea nuttallii when measuring that the sulphur content is in the required range; carrying out aeration on the sludge, standing, taking out for airing, and mixing with wheat straws, sawdust and rice bran according to the ratio; repeatedly spraying a nutrient solution, and then hermetically introducing oxygen for fermentation; stopping fermentation and sealing when measuring that the nitrogen content is within the required range, and planting amaranthus paniculatus, vicia villosa and ciliate desert-grass; and removing plants when heavy metal content in the fermented product is within the required range, taking out and drying the plants, and extruding the plants into blocks. The preparation method has the beneficial effects that the sludge is fully utilized to prepare the biomass fuel; the problems of secondary pollution of the sludge on the environment, occupation of much land and the like are solved; and sustainable and reasonable utilization of resources can be achieved; and the fuel is safe to use, environment-friendly, high in combustion heat value and low in consumption.

Description

technical field [0001] The invention relates to a method for preparing sludge biomass fuel, belonging to the field of fuel preparation. Background technique [0002] Sludge is an inevitable product of sewage treatment plants and sewage treatment. It is estimated that the amount of sludge produced in my country is 3 million tons per year, and the annual growth rate is greater than 10%. If all domestic urban sewage is treated, the dry weight of sludge will be about 8.4 million tons per year, accounting for about 10% of my country's solid waste. Even in several cities and regions with a high level of urbanization in my country, the problem of sludge treatment is already very prominent. Sludge that has not been properly treated and disposed of enters the environment, directly causing secondary pollution to water bodies and the atmosphere, which not only reduces the effective treatment capacity of the sewage treatment system, but also poses a serious threat to the ecological envi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: for sludge accumulation, incineration, and landfill treatment, the operating cost is high and a large amount of land resources are occupied, resulting in low safety performance and poor controllability of sludge treatment, which is easy to cause secondary pollution to the environment. A method for preparing sludge biomass fuel is provided. The present invention is to take sludge in a treatment tank, add sodium carbonate solution to mix, plant Elodea, and remove Elodea when its sulfur content is measured to be within the required range. , then aerate the sludge, take it out to dry after standing still, mix it with wheat straw, sawdust and rice bran in proportion, then spray the nutrient solution repeatedly, then seal it and pass it into oxygen for fermentation, and measure the nitrogen content when it is within the required range , stop fermentation and sealing, plant wild amaranth, purple-leaved sweet potato and centipede grass, when the heavy metals in the fermented product are within the required range, remove the plants, take them out and dry them, and squeeze them into blocks