How to turn sludge into fertilizer?
If sludge can be made a renewable resource, it not only solves the garbage problem of sludge, but also fundamentally solves the secondary pollution caused by improper use of sludge containing heavy metals, pathogenic bacteria, and toxic organics. Sludge treatment is generally landfill, fertilizer, power generation, heating and other methods. Landfilling involves the in-depth landfilling of some inseparable and unusable materials, allowing the natural world to decompose them through prolonged physical and chemical treatments. Fertilizer is used to make use of organic matter in sludge to make agricultural fertilizers; During the heating, the sludge is used for pyrolysis and fermentation to generate heat and biogas during fermentation. Among these treatments, fertilizer production is the most cost-effective and economical way to use it effectively. The use of fertilizers such as fertilizers is simple and convenient, as long as the operation is carried out, and it can be made in several days.
The method is to add appropriate amount of crushed straw, sawdust, and other organic materials in the sludge, and then put a small amount of a fertilizer starter into the sludge and stir it evenly. Generally 7-10 days can be completed by fermentation and can be used or sold at ease. The harmless treatment of urban sludge can reduce odor, reduce water, kill pathogenic bacteria and parasites (eggs), obtain composted sludge compost, compost, dry and pulverize the sludge, add appropriate amounts of chemical fertilizers and The beneficial microorganisms are made of organic compound fertilizers and bio-organic compound fertilizers.
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