Evaporation and Concentration Method of Yeast Wastewater

A yeast wastewater, evaporation and concentration technology, applied in the direction of heating water/sewage treatment, etc., can solve the problem of high energy consumption and steam consumption, and achieve the effects of reducing wastewater treatment costs, reducing steam consumption, and preventing foaming

Active Publication Date: 2015-11-25
ANGELYEAST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect of high energy consumption, especially high steam consumption, when the existing multi-effect evaporation and concentration system is used to treat yeast wastewater, and to provide a method for evaporation and concentration of yeast wastewater. The MVR system is used to reduce the Steam consumption reduces the cost of waste water treatment, and the comprehensive energy saving effect is remarkable

Method used

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  • Evaporation and Concentration Method of Yeast Wastewater
  • Evaporation and Concentration Method of Yeast Wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Beet honey was used as raw material to ferment Saccharomyces cerevisiae, and the yeast wastewater produced by the yeast during the yeast separation process was used as the evaporation and concentration object of this embodiment. The COD of the yeast wastewater is 5000mg / L, the solid content concentration in the wastewater is 4%±1% (W / W), and it is preheated to 60°C.

[0048] Yeast wastewater with 65m 3 The flow rate of / h enters the tubular heating tube of the heater 1 through the feed port 13 of the heater 1, and the material flows downward along the inner wall of the heating tube of the heater in a uniform film shape; at the same time, the raw steam at 115-125 ° C is passed through the inlet The gas port 14 enters the heater 1 and is evenly distributed on the outer wall of the tubular heating tube. The yeast wastewater in the heating tube exchanges heat with the raw steam on the outer wall of the heating tube to generate a two-phase material flow including gas phase a...

Embodiment 2

[0055] The process adopted in this example is basically the same as that in Example 1, except that the temperature of the compressed secondary steam is 85.5°C; the evaporation temperature of the yeast wastewater in the heater 1 is 78°C; the final solid concentration of the yeast wastewater is 10% (w / w). The MVR device using the process method of Example 2 can be continuously used for 17 days, and the scale thickness in the heater 1 is only about 5mm, and no crystallization occurs.

Embodiment 3

[0057] The process adopted in this example is basically the same as that in Example 1, except that the temperature of the compressed secondary steam is 85.5°C; the evaporation temperature of the yeast wastewater in the heater 1 is 78°C; the final solid concentration of the yeast wastewater is 12% (w / w). The MVR device using the process method of Example 3 can be continuously used for 16 days, and the scale thickness in the heater 1 is only about 5mm, and a small amount of crystallization is produced. Example 3 is compared with Example 1 to illustrate that the trend of material crystallization is enhanced while maintaining the output concentration while reducing the evaporation temperature.

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Abstract

The invention provides an evaporation concentration method of yeast wastewater. The method comprises the following steps: (1) an evaporation process, namely introducing the yeast wastewater into a heater (1) for heat treatment, and heating the wastewater to 78-82 DEG C to carry out evaporation to obtain a double-phase material flow comprising a gas phase and a liquid phase; (2) a separation process, namely separating the double-phase material flow in a separator (2); (3) steam compression circulation process, namely separating the compressed secondary steam obtained by treating the secondary steam using a steam compressor (3), wherein the compressed secondary steam is recycled to the heater (1) to be reused as a supplemental heat source; (4) a mother solution re-evaporation process, namely again carrying out the evaporation process in the heater (1) by recycling the mother solution separated from the separator (2) into the heater (1) until the solid content concentration in the yeast wastewater is 10-14% (W / W). By adopting the method provided by the invention, steam consumption is reduced, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for evaporating and concentrating yeast wastewater using MVR technology. Background technique [0002] The raw material for the production of active yeast is mainly waste molasses produced by sugar cane sugar factories or beet sugar factories. Molasses is a waste product from sugar factories and has a high impact on the environment. With the development of yeast fermentation technology, the use of waste molasses to produce active yeast has become one of the effective ways to effectively utilize waste molasses at home and abroad to solve the pollution of sugar factories. However, in the production of active yeast, the active ingredients in molasses can be used, and the undegradable sugars, colloids and new organic substances produced by yeast metabolism in the yeast fermentation will follow the various links in the production process. If the waste water is discharged...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04
Inventor 张林俞学锋李知洪余明华肖明华李天乐华同一杨建京
Owner ANGELYEAST CO LTD
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