Method for preparing biological organic fertilizer from sludge serving as raw material and application of biological organic fertilizer

Abstract

The invention belongs to the field of biological organic fertilizers, and in particular relates to a preparation method for a biological organic fertilizer by taking sludge as a raw material, and application of the biological organic fertilizer. The preparation method comprises a heavy metal passivation process, a material mixing process, an aerobic fermentation process, an anaerobic digestion process and a sieving and dividing process. The process flows are simple and convenient, the sludge is taken as the raw material, the effectiveness of heavy metals is reduced by a metal passivator, aerobic and anaerobic double-flow fermentation is combined, the obtained fertilizer integrates an organic fertilizer, an inorganic fertilizer and a biofertilizer and has the characteristics of no pollution, long effect, quick effect, synergism and the like, the investment scale is small, the invention is favorable for promotion and application, and a new way for harmless, reductive and regenerative treatment of sludge is provided.

Description

technical field [0001] The invention belongs to the field of bio-organic fertilizers, and in particular relates to a preparation method and application of bio-organic fertilizers using sludge as a raw material. Background technique [0002] With the acceleration of the urbanization process in our country and the great increase of urban sewage discharge, urban sewage has seriously polluted our living environment and endangered our health. Therefore, the treatment of urban sewage has increasingly attracted the attention of the society. According to the "Eleventh Five-Year" plan of the national environmental protection and the "Eleventh Five-Year" plan for the construction of urban sewage treatment and recycling facilities in the country, the sewage treatment rate of all cities in my country will not be lower than 70% by 2010, and the accompanying sludge ( Water content 80%) will be as high as 30 million tons / day, plus polluted river and lake dredging sludge and urban sewer slud...

AI Technical Summary

Problems solved by technology

[0005] At present, the main sludge disposal methods mainly include sanitary landfill, incineration and land utilization. The implementation of these methods has the following three prerequisites: first, there must be enough sludge landfill space; Expensive equipment investment and high operating costs; Third, there are strict restrictions on the content of harmful substances such as heavy metals in sludge

[0006] Among the current sludge disposal methods, the sanitary landfill of sludge began in the 1960s. However, there are two main problems in the sanitary landfill of sludge: one is that the filling pit contains various toxic and harmful Erosion and seepage pollute the groundwater environment; second, the places suitable for sludge landfill are becoming more and more limited due to the massive output of sludge and the acceleration of urbanization.

[0010] There are also relevant literatures on the use of urban sludge to prepare fertilizers, such as a kind of "Using urban sludge to make a series of special fertilizers and its method" disclosed in patent 200410043637.5. Thorough; patent application 00132414.4 discloses a "method for producing bio-organic compound fertilizers from municipal sludge", which is to mix dewatered sludge with a moisture content of 75-85% and dry sludge with a moisture content of less than 15% by volume 1:2 or mix dewatered sludge with a moisture content of 75-85% and return compost with a moisture content of less than 10-40% in a volume ratio of 1-2-3 to make it a sludge with a moisture content of 50-65% For mixed fertilizers, the difference in the above applications is in the composition of the materials, and the preparation process is basically the same

Patent applications related to microbial fertilizers, such as 94118231.2 (name: a production method of biological fertilizer and the microorganisms used therein), 00117587.4 (name: biological fertilizer composition and its application), 97118994.3 (name: an agricultural biological fertilizer and its application) Preparation method), 00131249.9 (name: natural whole element organic biofertilizer for melons and fruits), etc., although the technical schemes recorded are different and have their own advantages, there are also deficiencies in the comprehensive effect