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Yeast wastewater zero discharge treatment method

A technology of yeast wastewater and treatment method, which is applied in the field of yeast wastewater treatment, can solve the problems of high operating cost and dry wall, and achieve the effects of reducing energy consumption, reducing production cost, and avoiding dry wall

Active Publication Date: 2015-07-22
ZHEJIANG QIANCAOSU BIOTECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the technical problems of high operating cost and dry wall phenomenon in the existing multi-effect falling film evaporator concentrated yeast wastewater; and provides a zero-discharge treatment method for yeast wastewater

Method used

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  • Yeast wastewater zero discharge treatment method

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Embodiment Construction

[0022] combine figure 1 To describe in detail, the zero-discharge treatment method of yeast wastewater in the present invention is accomplished through the following steps:

[0023] Step 1. The yeast wastewater is passed into the first-stage tubular preheater 1 and preheated to 70°C with condensed water, and then passed into the second-stage tubular preheater 2 with raw steam for heat exchange and preheated to 90°C. ℃;

[0024] Step 2, then flow into the first-effect heater 3 to heat up to a temperature rise of 2°C, and then pass into the first-effect evaporation separator 4 for evaporation to obtain a double-material flow including gas phase and liquid phase, and the gas phase is passed into the steam compressor 7 for treatment and recycling Back in the heater, the liquid phase is circulated back to the first-effect heater 3 and mixed with the continuously fed yeast waste water to perform heating and evaporative separation cycles until the solid content in the yeast waste wa...

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Abstract

The invention discloses a yeast wastewater zero discharge treatment method, and belongs to the field of yeast wastewater treatment. The method solves the technical problems of high operating cost and drywall phenomenon in the existing multi-stage film fall evaporator yeast wastewater concentration. The method comprises the following steps: firstly, preheating yeast wastewater for two times to 90 DEG C; secondly, performing circulation of heating and separation by evaporating till the concentration of solid content in the yeast wastewater is 30 percent; thirdly, performing circulation of heating and separation by evaporating till the concentration of solid content in the yeast wastewater is 50 percent, and ensuring that a discharged material part returns a material inlet part; then adopting conventional centrifugation and spray drying methods to obtain organic fertilizer and feed additives; discharging condensate water after the condensate water is subjected to biochemical treatment and meet wastewater standard. The method effectively controls the concentration of materials in all links, and avoids the drywall phenomenon of heating tubes. According to the method, evaporated and separated gas phase is reused, so that the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of yeast wastewater treatment. Background technique [0002] The yeast industry is mainly water pollution. The yeast wastewater with waste molasses as the main raw material has a darker brownish black color due to the high content of melanin, phenols and caramel; yeast wastewater contains about 0.5% dry matter , the main components are yeast protein, cellulose, colloidal substances, and nutrients such as residual sugar in waste molasses that have not been fully utilized. Yeast wastewater separated from yeast liquid fermentation tank, COD30000-70000mg / L, up to 110000mg / L, and changes with yeast production batches. Some yeast enterprises treat this part of yeast wastewater separately. The main process is evaporation and concentration process, and the concentrated solution is further prepared as organic fertilizer for agricultural use; although the evaporated water has a very light color, the COD value is still 2000mg / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04
CPCC02F1/04C02F1/041C02F2301/08
Inventor 孙国梁
Owner ZHEJIANG QIANCAOSU BIOTECH CO LTD
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