Blue alga cake tubular pyrohydrolysis dewatering method and device

Abstract

The invention provides a blue alga cake tubular pyrohydrolysis dewatering method and a blue alga cake tubular pyrohydrolysis dewatering device. The device provided by the invention consists of a feeding system, a modifying system, a dewatering system, a heat exchange system and a purifying system. The method comprises: filling the pretreated blue alga cake raw material with a water content of about 80 percent by using raw material tank, heating the raw material by low-pressure steam directly, performing pyrohydrolysis under a medium-temperature condition, fully recovering and using residual energy in a hydrolysis process, adding treated clay, increasing the specific gravity of the mixture and obtaining a liquid-solid mixture; making the water content in the treated material obtained after liquid-solid separation adjustable, and reducing the water content to 40 to 60 percent from the 80 percent in the originally treated blue alga cake. Compared with the prior art, the device has the advantages that: the structure is simple, the operation is continuous and smooth; the hydrolysis temperature of algae is 110 to 150 DEG C; the reaction time is 10 to 20 minutes; the alga treatment is economic; reduction and innocent treatment can be realized quickly and effectively; and large-scale treatment can be carried out easily. Therefore, the invention provides a new approach for the treatment, disposal and recycling of blue algae and the recovery of energy from the equipment.

Description

technical field [0001] The invention relates to the technical field of water bloom cyanobacteria waste treatment, in particular to a method for reducing and dehydrating lake water bloom cyanobacteria, in particular to a method and device for tubular thermal hydrolysis dehydration of cyanobacteria, belonging to the field of agricultural environmental protection. Background technique [0002] With the increasing development and utilization of environmental resources by human beings, the development of industry and the high concentration of urban population, a large amount of industrial wastewater and domestic sewage containing pollutants will be discharged into the water body without proper treatment, making the ammonia nitrogen, phosphorus and organic matter in the water body The increase in the concentration of pollutants and other oxygen-consuming substances increases the load of nutrients in the water; and in order to increase the yield of crops, the application of chemical...

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Problems solved by technology

[0005] At present, the municipal treatment and disposal of cyanobacteria mainly adopts salvage and pressing dehydration. The main problems are: salvage is an important measure to eliminate algal bloom pollution in inland water bodies. The water content of the cyanobacteria cells is about 90%, and the salvaged cyanobacteria cells still have a large amount of gravity water and adsorption water in the compartment. Regardless of whether manual or mechanical methods are used to salvage, the water content of the blooming cyanobacteria is generally 95%-99%. Excessive water content not only brings great costs to the transportation of cyanobacteria, but also brings great difficulties to the final disposal of cyanobacteria

[0014] However, the above-mentioned methods are only for the purpose of unilaterally collecting and reducing the water content of cyanobacteria. The process requires more treatment processes, harsh equipment requirements, large-scale production is difficult, the process cannot be effectively guaranteed, and the economic cost of cyanobacteria disposal is high.

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