Biological organic fertilizer and method for preparing the biological organic fertilizer by fermentation of municipal sludge

Abstract

The invention relates to the field of biotechnology, in particular to a good-quality biological organic fertilizer and method for preparing the good-quality biological organic fertilizer by fermentation of municipal sludge. The method comprises well mixing sludge 55-65wt%, conditioner 0.5-0.75wt%, straw 25-35wt%, humic acid 5-15% and decomposing microbial inoculums 0.01-0.02wt% to serve as a fermentation material with a water content 50-60%; heaping the fermentation material at 10 DEG C. for 2-3 days to allow the fermentation material temperature to rise to 55-65 DEG C. while turning for 1-2 times every day and controlling the fermentation temperature at 55-60 DEG C. for 5-7 days; and further decomposing for 3-5 days when the heap fermentation material is cooled to 30-40 DEG C. The inventive method has simple process and low cost, and can produce a biological organic fertilizer with good fertilizer effects and solve the problem that the long-term stored municipal sludge can pollute the environments.

Description

[0001] technical field [0002] The invention relates to the field of biotechnology, in particular to a high-quality bio-organic fertilizer prepared by fermenting municipal sludge and a method thereof. Background technique [0003] Municipal sludge is solid, semi-solid and liquid waste produced by urban purification and treatment of sewage, with a huge amount and rapid growth. It mainly comes from primary sedimentation tank sludge and residual activated sludge. Sludge from urban sewage treatment plants includes solid particles such as sediment, fibers, animal and plant residues in wastewater and their coagulated flocs, bacterial micelles formed by various microorganisms and their adsorbed organic matter, heavy metal elements and salts Species, a small amount of pathogenic microorganisms, parasite eggs and other comprehensive solid substances. Sludge is perishable and smelly. If it is discharged without treatment, it will cause serious pollution to the environment. [0...

AI Technical Summary

Problems solved by technology

The reason is that there are many key problems in the sludge composting process itself that have not been resolved.

[0005] ⑴The composting speed is slow, resulting in high cost

[0006] The traditional composting speed is slow and the time is long, and it takes more than one month for composting to mature, resulting in an increase in composting costs

[0007] ⑵Ammonia volatilization, causing environmental pollution

[0008] Fertilizer efficiency is the most critical factor determining the agricultural efficacy of sludge composting. The relatively low fertilizer efficiency of compost makes compost lack competitiveness and economic efficiency in the market, which is not conducive to the promotion and sales of sludge compost in the market.

[0009] (3) High water content of sludge increases the difficulty and cost of composting

[0010] At present, sludge from sewage plants in my country is usually concentrated and then mechanically dehydrated. If it is to be composted, it still needs to be further dried to reduce the moisture content, which increases the difficulty and cost of sludge composting to a certain extent.