Sludge-biological carbon organic compound fertilizer and preparation method thereof

Abstract

The invention provides sludge-biological carbon organic compound fertilizer and a preparation method thereof. The sludge-biological carbon organic compound fertilizer is prepared from the following raw materials: sludge, biological carbon, a mineral powder binding agent, a compound microorganism bacterium agent, a granulation binding agent and a film coating material; the preparation method of the compound fertilizer comprises the following steps: carrying out high-temperature cracking on crop straws to prepare the biological carbon; after mixing the sludge with the straws and composting, dehydrating, sterilizing and curing; removing heavy metal elements by utilizing a biological leaching method; after mixing and melting the prepared sludge and the biological carbon according to a reasonable ratio, melting and granulating; carrying out screening and film coating on grains to prepare the sludge-biological carbon organic compound fertilizer. The compound fertilizer provided by the invention sufficiently utilizes a lot of residual sludge and straw resources and has the advantages of fertilizer slow release, soil improvement, carbon fixation and emission reduction and the like; the nutrient matching is reasonable; after the sludge-biological carbon organic compound fertilizer is matched with conventional compound fertilizer and is applied, the fertilizer efficiency and the utilization rate can be effectively improved and the yield and quality of crops are remarkably improved. The method provided by the invention has relatively low cost and a feasible process and is suitable for large-scale popularization.

Description

technical field [0001] The invention relates to a sludge-biochar organic compound fertilizer and a preparation method thereof. Background technique [0002] About one-third of the crop stalks in rural areas of our country are not used, and a large part of them are burned directly, which not only wastes high-grade biomass resources, but also leads to a series of environmental pollution problems. With the rapid development of the economy and industrial scale, urban sewage treatment plants are producing a large amount of surplus sludge every day. Due to the complex sources of these sludge, some components are unstable and unsafe. At present, the main treatment method is underground burial. The way it is handled goes against the basic principles of sustainable development. If straw and municipal sludge can be harmlessly treated, stabilized and utilized as resources, it will produce huge economic and ecological benefits. [0003] Sludge is an accessory after sewage treatment. I...

AI Technical Summary

Problems solved by technology

[0002] About one-third of the crop straws in rural areas of our country are not used, and a large part of them are burned directly, which not only wastes high-grade biomass resources, but also leads to a series of environmental pollution problems

With the rapid development of the economy and industrial scale, urban sewage treatment plants are producing a large amount of surplus sludge every day. Due to the complex sources of these sludge, some components are unstable and unsafe. At present, the main treatment method is underground burial. The treatment is contrary to the basic principles of sustainable development

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