Blue-green alga mud deep-dehydration method based on thermal rearrangement of capsular polysaccharide soft lattices

Abstract

The invention provides a blue-green alga mud deep-dehydration method based on thermal rearrangement of capsular polysaccharide soft lattices. The method comprises the following steps: pretreating blue-green alga mud, carrying out heating, adding a multivalent cationic salt, adjusting a pH value to 1.5-5, enabling a ratio of the energy storage modulus of the blue-green alga mud to the loss modulusof the blue-green alga mud to be less than 3.0 so as to ensure that capsular polysaccharide soft lattices in the blue-green alga mud to undergo thermal rearrangement, then pumping the treated blue-green alga mud into a preheated dehydration device, wherein a preheating temperature is in a range of 70-100 DEG C, and carrying out hot-pressing dehydration. The method has the advantages of simple process, mild reaction, good dehydration effect, no addition of conditioners such as calcium oxide and clay, cost reduction, capacity of reducing the inorganic matter content of a blue-green alga cake andrelatively increasing the organic matter content and the calorific value of a filter cake, and no increase in the COD of a filtrate; and dehydrated and dried blue-green alga powder is high in organicmatter content (with a ratio of volatile solid to total solid of more than 85%) and high in heat value, the recycling ways of blue-green alga can be increased, and the quality of subsequent productscan be improved.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a deep dehydration method of blue-green algae mud based on capsular polysaccharide soft lattice thermal rearrangement. Background technique [0002] Cyanobacteria are ecological products produced after eutrophication of freshwater lakes. Since the cyanobacteria water crisis broke out in Taihu Lake in 2007, Wuxi City has been organizing scientific research forces to solve the problems of cyanobacteria salvage and harmless treatment, and has become an auxiliary center for the promotion of advanced cyanobacteria treatment technology to all parts of the country. At present, cyanobacteria mud with a water content of about 90% is generally landfilled, which occupies a large area and occupies land resources. Further volume reduction treatment of cyanobacteria mud is still required. Although cyanobacteria mud can be utilized as a resource through biogas production, b...

AI Technical Summary

Problems solved by technology

Although this method can dehydrate the blue-green algae mud to about 50%, its pre-treatment is more cumbersome, and there are many kinds of agents added, which is difficult for practical application

In addition, the application number is 201910040109.0, a method for deep dehydration of cyanobacteria, which uses the Fenton reaction to oxidize and degrade organic matter into small molecules, which is beneficial to dehydration by pressure filtration, but due to molecular degradation, the COD in the filtrate will increase significantly. Increased difficulty in handling the filtrate

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