Novel method for utilizing blue-green algae in Taihu lake

Abstract

The invention discloses a novel method for utilizing blue-green algae in the Taihu lake, and belongs to the field of waste resource utilization and biomass energy. The method comprises the following steps: dewatering and drying the blue-green algae in the Taihu lake until the water content of the blue-green algae in the Taihu lake is 8 to 25 percent; dewatering and drying other biomass waste until the water content of the other biomass waste is 8 to 25 percent, crushing the dewatered and dried biomass waste to 5 to 10 mm; uniformly mixing 20 to 100 percent of the dried blue-green algae in the Taihu lake and other 0 to 80 percent of biomass raw materials, all by dry weight, and performing extrusion forming on the mixture by using a forming machine at the forming pressure of 100 to 300 MPa and the forming temperature of 70 to 170 DEG C to obtain solid fuel. The forming method for a mixed biomass fuel, disclosed by the invention, has the characteristics that 1) the method is simple, feasible and environment-friendly, the treatment efficiency is high, the cost of raw materials is low, and large-scale industrial production is facilitated; 2) the blue-green algae in the Taihu lake is added into the solid fuel, so that the forming is facilitated, and the combustion characteristics of the fuel are improved; 3) the recycling of the blue-green algae in the Taihu lake is realized, and meanwhile, the source of the raw materials of the solid fuel is enriched.

Description

technical field [0001] The invention belongs to the fields of waste recycling and biomass energy, and relates to a method for recycling Taihu cyanobacteria, specifically refers to preparing solid fuel by extruding Taihu Lake cyanobacteria and other biomass wastes as raw materials. Background technique [0002] When cyanobacteria blooms break out, thick blue-green lakes form on the water surface, causing great harm to people's lives and the ecological environment: 1) The turbidity of the water body increases, the water color deepens, and the transparency decreases, which affects water quality; 2) Some cyanobacteria are growing Or send out unpleasant smell in the decomposition process, affect tourist landscape; 3) the dissolved oxygen in water can be consumed in a large amount when cyanobacteria grows, make fish suffocate and die, reduce and destroy the flavor and quality of aquatic products; 4) the occurrence of cyanobacteria bloom makes Aquatic vegetation disappears, biodive...

AI Technical Summary

Problems solved by technology

[0002] When cyanobacteria blooms break out, thick blue-green lakes form on the water surface, causing great harm to people's lives and the ecological environment: 1) The turbidity of the water body increases, the water color deepens, and the transparency decreases, which affects water quality; 2) Some cyanobacteria are growing Or send out unpleasant smell in the decomposition process, affect tourist landscape; 3) the dissolved oxygen in water can be consumed in a large amount when cyanobacteria grows, make fish suffocate and die, reduce and destroy the flavor and quality of aquatic products; 4) the occurrence of cyanobacteria bloom makes Aquatic vegetation disappears, biodiversity declines, the original community structure is destroyed, and the material circulation and energy flow in the original water ecosystem are hindered, which eventually leads to the imbalance of the entire water ecosystem; 5) Cyanobacteria cells contain some algae toxins, When cyanobacteria cells die and rot, they will release algal toxins, and the released toxins have a great impact on the liver function of organisms. Drinking water containing microcystins for a long time can induce liver cancer, rectal cancer, and directly threaten human health.

[0003] When blue-green algae breaks out on a large scale, salvage is still the most effective and feasible way to solve the blue-green algae crisis. It can not only reduce the density of algae, but also take away nutrients such as nitrogen and plate, and reduce the problem of eutrophication in water bodies. If it is not handled properly, it will cause a series of problems: 1) the moisture content (~90%) of freshly salvaged cyanobacteria is very high, and transportation is inconvenient, which increases the burden of transportation costs and subsequent treatment costs; 2) random placement of algae will take up a lot of land ; 3) Arbitrary placement of algae causes environmental problems such as stench; 4) Salvage of algal toxins and other toxic substances contained in blue-green algae can lead to liver dysfunction or even liver cancer if eaten by mistake. secondary pollution problem

[0004] At present, the following research and development have been carried out on the utilization of cyanobacteria resources at home and abroad: 1) anaerobic fermentation, which uses cyanobacteria anaerobic fermentation technology to produce biogas and fertilizer, but the fermentation cycle is long and occupies a large area; 2) aerobic composting, Mainly including cyanobacteria composting and cyanobacteria directly used as fertilizer; 3) extracting phycocyanin and other biologically active substances; 4) cyanobacteria feed, mainly including processing cyanobacteria into feed or extracting amino acids as feed additives, etc., but there are microcystis Limiting factors such as toxin residue, cyanobacteria conversion rate and cyanobacteria wall breaking cost