Method for co-composting of blue-green algae and polluted bottom sediment

Abstract

The invention relates to a technology for co-composting of blue-green algae and polluted bottom sediment, and belongs to the technical field of environmental engineering. The technology comprises the following steps: at first, heavy metal in the polluted bottom sediment is removed by adopting a bioleaching technology, then blue-green algae and the polluted bottom sediment are mixed, the physicochemical property of the mixture of the blue-green algae and the bottom sediment is regulated to the condition needed by growth of aerobic fermentation microorganisms through adopting conditioners such as straws, rice husks, bran, spent mushroom composts, dregs of decoctions, wood chips and the like by means of the characteristics of high water content of the blue-green algae and C / N ratio imbalance and the like, a certain quantity of nitrogen conserving agents is added, and then a forced ventilation fermentation manner is adopted in a compost factory, the temperature of the compost is increased to be more than 60 DEG C within an extremely short time, the high-temperature fermentation period is kept for about 15 days, and the compost is transferred in a secondary fermentation zone till the compost is decomposed thoroughly after the high-temperature fermentation period is ended. The technology achieves the cleanness of the polluted bottom sediment and large-scale treatment of the quick composting of blue-green algae and the polluted bottom sediment, and combines the harmlessness and the reclamation of the algae and the polluted bottom sediment organically.

Description

1. Technical field [0001] The invention relates to a method for mixing and composting blue-green algae and polluted bottom mud, which is a technology for harmless and combined resource utilization of blue-green algae and polluted bottom mud, and belongs to the technical field of environmental engineering. 2. Background technology [0002] In recent years, the eutrophication of water bodies in my country has been serious, especially in Dianchi Lake and Taihu Lake. The eutrophication of water bodies has caused a large number of blue-green algae outbreaks. At present, salvage is still the fastest way to solve the blue-green algae crisis. Taking Taihu Lake as an example, during the period of cyanobacteria outbreak, more than 1,000 tons of blooming cyanobacteria were salvaged every day, and the maximum could reach 2,000 tons. Although cyanobacteria contain algal toxins, they are also rich in protein, nitrogen, phosphorus and other nutrients, and have the potential for resource ut...

AI Technical Summary

Problems solved by technology

For bottom mud resources, Japan uses bottom mud to produce high-grade building materials, because the bricks made of bottom mud as the main raw material have good air permeability, light weight, and rich colors, which are very suitable for building decoration materials; The mud method is to directly heat-dry the bottom mud and add inorganic fertilizers and other structure modifiers to make it into granules, which can be used as fertilizers rich in nitrogen and phosphorus. get effective control

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