Method for producing forestry controlled-release fertilizer by utilizing sludge of urban sewage plant

Abstract

The invention discloses a method for producing a forestry controlled-release fertilizer by utilizing sludge of an urban sewage plant. The method comprises the following steps: 1) pouring the sludge of the urban sewage plant into an anaerobic regulating tank, and mixing with AcmecTG enzyme and protease; (2) uniformly stirring the sludge mixture in the step (1) in a sludge adjusting tank, and feeding into an anaerobic digestion tank for anaerobic digestion; 3) pumping the municipal sewage plant sludge stabilized by anaerobic digestion into a pretreatment tank, adding a reverse emulsifier, polyaluminum sulfate and zeolite powder, intensely stirring, decomposing the colloidal structure of the sludge, and dehydrating by a plate frame anaerobic machine; 4) feeding the dehydrated mud cake into an aerobic fermentation workshop, adding a leavening agent, a conditioner, an EM strain and brown sugar, uniformly turning and throwing, and stacking for aerobic fermentation; and 5) granulating the fermented semi-finished sludge product of the municipal sewage plant by a one-time drying granulation method, and carrying out coating treatment to obtain the forestry controlled-release fertilizer.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for producing forestry controlled-release fertilizers by utilizing sludge from urban sewage plants. Background technique [0002] With the improvement of urban sewage treatment rate in my country, the sludge output of urban sewage plants has also increased sharply. At present, only a small part of urban sewage treatment plants in the country are used for sanitary landfill, land use, incineration and building materials utilization, etc., while a part of the unstandardized treatment and disposal sludge is rich in nutrients such as organic matter, and contains a certain amount of heavy metals, viruses, etc. Harmful substances such as pathogens and parasite eggs can easily cause secondary pollution to groundwater and soil without effective treatment, directly threatening environmental safety and public health, and greatly reducing the environmental benefits of sewage treatmen...

AI Technical Summary

Problems solved by technology

However, due to many shortcomings such as large land occupation, long processing time, low applicability of processing equipment, and low sludge treatment rate, the composting treatment of sludge has not been able to enter the stage of industrialized treatment for a long time.

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