System and method for extracting microprotein from sludge through hydrolysis

Abstract

The invention provides a system and a method for extracting microprotein from sludge through hydrolysis, relating to the field of sewage and sludge treatment. The system comprises a sludge storage device, a sludge conveying device, a mixing device, a hydrolysis reaction device, a flash distillation device, a solid-liquid separation device, a residue collecting and conveying device, a filtrate collecting device, a preheating device, an evaporation concentration device, a drying device, a waste gas collecting device, a waste gas treatment device, a waste gas discharge device and a process waterrecovery device. The extraction method comprises the following steps of: completely hydrolyzing activated sludge, flash distilling, cooling, carrying out solid-liquid separation, and concentrating the filtrate to obtain the microprotein solution product with the concentration of 5%-40% by mass percentage or drying to obtain a microprotein dry powder product. When used for extracting microprotein from sludge through hydrolysis, the invention has the advantages of low energy consumption, high production efficiency and high extraction ratio of microprotein, and the microprotein products have excellent performance and better foaming performance than foaming agents in market.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a sludge hydrolysis extraction microbial protein system and an extraction method. Background technique [0002] With the increase of the sewage treatment rate and the deepening of the treatment degree, the sludge output of the sewage plant is increasing year by year, which causes great harm to the water source, the atmosphere, the land and human health, mainly in the following aspects: (1) The impact on the water source Hazards: During the unmeasured stacking and landfilling of sludge, a large amount of acidic, alkaline, toxic substances and heavy metals in sludge are produced, which flow into surface water sources after rain and penetrate below the surface, causing black and odorous underground water and deteriorating water quality. At present, 60% of the rivers in the country have been polluted by ammonia nitrogen, volatile phenol, and permanganate, and the fluoride has s...

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Problems solved by technology

[0002] With the increase of the sewage treatment rate and the deepening of the treatment degree, the sludge output of the sewage plant is increasing year by year, which causes great harm to the water source, the atmosphere, the land and human health, mainly in the following aspects: (1) The impact on the water source Hazards: During the unmeasured stacking and landfilling of sludge, a large amount of acidic, alkaline, toxic substances and heavy metals in sludge are produced, which flow into surface water sources and penetrate below the surface after rain, causing black and odorous underground water and deteriorating water quality

At present, 60% of the rivers in the country have been polluted by ammonia nitrogen, volatile phenol, and permanganate, and the fluoride has seriously exceeded the standard. Coupled with the inflow and infiltration of sludge and wastewater, the water body has lost its self-purification function, affecting the reproduction of aquatic organisms and the utilization of water resources.

(2) Pollution to the atmospheric environment: due to incineration or long-term stacking, the discharged sludge releases a large amount of odor, dioxin, sulfur dioxide and other toxic gases, and dust and fine particle suspension migrate with the wind, resulting in sulfur dioxide in the air and suspended particulate matter exceeded the standard, acid rain and dusty weather occurred frequently

(3) Harm to the land: land erosion, sludge production of about 18 million tons per year, organic matter, heavy metals, pathogenic bacteria and other harmful substances are left in the soil, and hard-to-degrade substances seriously corrode the land and pollute groundwater sources

(4) Harm to human health: Sludge incineration, landfill, and stacking release a large amount of dust, dioxin, sulfur dioxide and other toxic gases, which pose a carcinogenic risk to the human body

The problems in the above-mentioned process are as follows: (1), continuously feeding steam for stirring, destroys the uniformity of the material in the hydrolysis process, cannot guarantee the balance of water in the hydrolysis process, and affects the hydrolysis effect; (2), the material after hydrolysis is directly used The residual pressure is used for filtration. As the filtration progresses, the pressure in the kettle gradually decreases, so that the solid-liquid separation cannot be completed; (3), before the hydrolyzed material enters the filtration equipment, there is no cooling device, and the material relies on natural cooling, which cannot guarantee the hydrolysis reaction. (4), filtering immediately after the completion of hydrolysis will cause damage to the filter equipment due to excessive temperature of the material, and the solid-liquid separation cannot be completed; (5), mentioned in the patent that the filtered The filtrate is concentrated in the long-tube concentration equipment. The single-effect long-tube evaporation consumes a lot of energy, and the evaporation time is too long, which cannot guarantee the product performance of the sludge protein.

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