Method for efficiently treating plant protein wastewater

Abstract

The invention discloses a method for efficiently treating plant protein wastewater, and belongs to the field of protein wastewater treatment. The method includes 'multistage pre-treatment, efficient anaerobic, anoxia and aerobic' combined technologies, so that efficient anaerobic treatment, stable running and recycling can be carried out on the plant protein wastewater. A 'multistage pre-treatment technology' mainly includes physiochemical per-treatment and biochemical pre-treatment; suspended particles in the plant protein wastewater can be efficiently intercepted by the aid of the physiochemical pre-treatment, and bean pulp resources in the plant protein wastewater can be recycled by the aid of the physiochemical pre-treatment; protein can be destructed by the aid of the biochemical pre-treatment, calcium ions and phosphate radicals can be intercepted by the aid of the biochemical pre-treatment, and anaerobic disturbance influence factors can be eliminated; the pH (potential of hydrogen) and the temperature of inlet water can be reasonably controlled by efficient anaerobic units, accordingly, anaerobic systems can assuredly efficiently and stably run, and the volume load of the anaerobic systems can reach 25 kg / (m<3>.d). Compared with the traditional processes and technologies for plant protein wastewater, the technical method has the advantages of high efficiency, stability, high resource utilization rate and the like. Besides, the plant protein wastewater can be efficiently treated by the aid of the method.

Description

technical field [0001] The invention belongs to the field of protein waste water treatment, and more specifically relates to a high-efficiency treatment method for plant protein waste water. Background technique [0002] Soybean protein is an important vegetable protein, which is widely used in various food processing industries due to its rich protein nutrients. The production of soybean protein isolate in my country started relatively late, and more than 60 protein isolate manufacturers have been established and put into production, mainly distributed in Shandong, Henan, Hebei and the three northeastern provinces. The annual output of soybean protein in my country is about 1 million tons, and the export volume accounts for more than half of international trade. At present, the domestic soybean protein production process is mainly "alkali-dissolving and acid-precipitating method". figure 2 As shown, a large amount of wastewater will be generated in the soybean protein prod...

AI Technical Summary

Problems solved by technology

Plant protein wastewater has the following characteristics: (1) High protein content: This is caused by the protein process itself. After the "alkali-soluble acid precipitation" in the conventional soybean protein production process, there are still a large amount of protein substances in the water, which is not only a waste A large number of raw materials, and it increases the difficulty of subsequent wastewater treatment

(2) Strong pH buffering performance: After the "alkali-dissolving and acid precipitation" in the soybean protein production process, the remaining protein substances in the water have strong acid-base buffering performance, and can gain electrons in acidic solutions and lose electrons in alkaline conditions. Therefore, if Without removing this part of the protein, it is very difficult to adjust the water pH to neutral only by adding acid or alkali. Not only does it need to consume a lot of acid or alkali, but the pH of the water after mixing is unstable, The pH will still change with time

(3) High SS content: A large amount of soybean meal residue remains in the protein wastewater. If it is not effectively removed in the physical and chemical unit, these suspended solids are difficult to be degraded by microorganisms in the biochemical unit, and these suspended solids will adhere to the biochemical system. The surface of the granular sludge will block the mass transfer channels of the granular sludge, resulting in the death or hollowing of the sludge, or under water conservancy conditions, the suspended particles may have a certain degree of shearing effect on the granular sludge, resulting in the disintegration or fragmentation of the sludge

However, there are generally technical problems in the industry that the anaerobic system is difficult to operate efficiently and stably. The current anaerobic unit granular sludge disintegrates seriously, and there are a large amount of fine granular sludge in the effluent. The anaerobic system cannot realize the proliferation of granular sludge, and periodic Adding granular sludge brings huge sewage treatment costs to protein production enterprises, and even inhibits the continuous expansion of production scale

Shandong University, Tsinghua University and many other colleges and universities have carried out research work on the treatment of protein wastewater, but no key technological breakthroughs have been made in the field of theoretical discovery and engineering practice. The air flotation effect is not good, the volume load of the anaerobic system is low, the granular sludge needs to be replenished periodically, and the industry is facing technical difficulties in standard upgrading and transformation. Although technical personnel in this field are aware of the current technical problems, However, the root cause of this technical problem has not been fully recognized, so there is no way to find a targeted solution. At present, the common patented technology for protein wastewater treatment mainly focuses on the optimization and transformation of the anaerobic reaction device itself (soybean protein wastewater treatment device) and its treatment method, CN201510095066.8; anaerobic methanogenesis and anammox combined treatment device and method for soybean protein wastewater, CN201410454215.0; a new type of high-efficiency anaerobic processor for soybean protein wastewater, CN201110444751.9), these patents The technology only stays in how to transform the anaerobic reactor, and does not involve the solution to the fundamental problem, so it is impossible to solve the practical problems in the industry. The technical personnel in the industry lack the overall grasp and key points of the protein wastewater treatment process, and there is no The corresponding patented technology solves the common technical problems in the field of wastewater treatment in the protein industry by choosing a reasonable method

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