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Recovery processing method of protein waste water

A technology for the recovery and treatment of protein wastewater, which is applied in the field of recovery and treatment of protein wastewater, to achieve the effects of easy operation, high treatment cost and simple process

Inactive Publication Date: 2010-07-14
上海启源环境科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of recovery and treatment of protein wastewater in the prior art, the present invention provides a method for recovery and treatment of protein wastewater. Compared with traditional biochemical treatment methods, the core of this method is to use membrane separation technology to recycle valuable waste water. Resources, turning polluting substances into useful substances; rather than degrading and decomposing substances in wastewater to reduce their hazards

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Embodiment 1

[0017] Embodiment 1: Ultrafiltration nanofiltration combined recovery treatment of milk whey

[0018] Milk whey is a kind of animal protein waste water, which is a very important by-product in cheese production industry. In general, processing 100kg of milk will result in 10kg of cheese and 90kg of whey. In this embodiment, whey produced from fresh milk casein is used as raw material. Firstly, the roll-type polyethersulfone ultrafiltration membrane is used for protein recovery. The ultrafiltration operating conditions are: pressure 0.5MPa, temperature 35°C, pH 4.1, after concentration 9 times, add water amounting to 15% of the raw material volume in two times. After the ultrafiltration, the whey raw material was concentrated about 9 times, the whey protein recovery rate was 87%, the whey protein content increased from the initial 0.62% to 4.87%, and the lactose content decreased from the initial 5.85% to 0.37%. Compounds were reduced from the initial 0.73% to 0.19%, and the ...

Embodiment 2

[0021] Embodiment 2: the nanofiltration recovery treatment of milk whey

[0022] The milk whey is treated with a nanofiltration system, the whey is concentrated more than 3 times, and the permeate is tested, and no protein is detected in it, and the lactose content is 0.01%. The turbidity is significantly lower than that of whey, and it is colorless and transparent , CODcr, BOD5 removal rates were 97.62%, 99.17%.

Embodiment 3

[0023] Embodiment 3: the recycling processing of soybean whey

[0024] Soy whey is produced during the production process of soybean protein isolate. Industrial production of 1 ton of soybean protein isolate requires about 60 tons of whey. The soybean whey is subjected to alkaline precipitation with Ca(OH)2 to obtain a supernatant, and then the supernatant is processed through membrane filtration. Ultrafiltration is used as the first stage of membrane filtration to recover protein; nanofiltration is used as the second stage of membrane filtration to recover oligosaccharides; reverse osmosis is used as the third stage of membrane filtration to intercept amino acids and inorganic salts, and the effluent can be used as process water for recycling use. In the ultrafiltration process, after treatment, the COD value of the whey stock solution drops from 14360 mg.l-1 to below 10 mg.l-1, reaching or approaching pure water and reused in the process.

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Abstract

The invention discloses a recovery processing method of protein waste water, belonging to the field of food waste water processing. The processing method is as follows: after early-day preprocessing, protein waste water passes through an ultrafiltration system; after passing through a filtration membrane with different cut-off molecular weight ranges, separated and purified protein is obtained by recovering from concentrated cut-off liquid; ultrafiltration permeate passes through a nanofiltered system or a reverse osmosis system; on one hand, other micromolecule useful substance can be further recovered from the concentrated cut-off liquid, on the other hand, permeate can be directly discharged or serves as process water to be recovered; or preprocessing protein waste water is directly processed by a nanofiltered membrane or a reverse osmosis membrane, and useful substance is recovered. The invention realizes the recycling recovery processing of protein waste water, solves the problems of high treatment cost and environment pollution due to hard processing of protein waste water and has wide adaptability, simple technology, easy operation and low operation cost.

Description

Technical field: [0001] The invention relates to a method for treating wastewater, in particular to a method for recycling and treating protein wastewater using membrane technology. Background technique: [0002] As one of the by-products of food processing industries such as milk and soybeans, the treatment of protein wastewater has always been a difficult problem. The main reason is that such wastewater often contains rich nutrients, such as soluble protein, sugar, and vitamins. etc. The existence of these nutrient elements has caused protein wastewater to have the characteristics of high pollution and difficult treatment; some current treatment methods for protein wastewater, such as biochemical treatment, mainly focus on degrading and decomposing nutrients such as protein and sugar in wastewater post-treatment so that the wastewater can be discharged; the current treatment method not only makes the treatment cost high and the treatment effect unstable due to the high con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/44C02F1/66C02F1/38C02F103/32
Inventor 程兆鹏
Owner 上海启源环境科技有限公司
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