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Method for treating yeast wastewater

A treatment method, a technology for yeast wastewater, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large footprint, large investment, etc., and achieve treatment costs low cost, high biochemical efficiency, and simple operation

Active Publication Date: 2010-06-16
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process requires a large investment and covers a large area, and the treatment cost after the fertilizer is sold to offset the cost still reaches 38 yuan / t

Method used

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  • Method for treating yeast wastewater

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Embodiment 1

[0045] A pilot test was carried out on wastewater from a yeast factory. The COD of the raw water was about 31600mg / L, and the surface load of the primary sedimentation tank was 0.85m 3 / m 2 h, the pre-acidification time is 8 hours, adjust the pH value of the wastewater to about 7 and pump it into the upflow multi-stage treatment anaerobic reactor, and the reactor load is 18.5kgCOD / m 3 d, the ascending flow rate is 6m / h, and the volume load of the aerobic tank is 1.0BOD / m 3 d, dissolved oxygen 2mg / L, sludge concentration about 3500mg / L, aerobic effluent COD 380mg / L, add H 2 o 2 800mg / L, FeSO 4 ·7H 2 O 436mg / L, the hydraulic retention time in the upflow heterogeneous oxidation tower is 0.5h, after the air flotation treatment, the COD of the effluent is 87mg / L, reaching the first-level national comprehensive wastewater discharge standard.

Embodiment 2

[0047] A certain yeast factory in Guangxi adopts the method of the present invention to treat the waste water of the factory, the COD of the waste water is about 27000mg / L, and the design treatment capacity is 3000m 3 / d, the surface load of the primary sedimentation tank is 0.97m 3 / m 2 h, the hydraulic retention time is 3 hours, the pre-acidification time is 10 hours, the pH value of the effluent from the circulating tank is about 7, and it is pumped into the upflow multi-stage treatment anaerobic reactor, and the reactor load is 20kgCOD / m 3 d, the ascending flow rate is 7.5m / h, and the volume load of the aerobic tank is 0.8BOD / m 3 d, dissolved oxygen 2mg / L, sludge concentration about 3500mg / L, aerobic effluent COD 300mg / L, add H 2 o 2 900mg / L, FeSO 4 ·7H 2 O 380mg / L, the hydraulic retention time in the upflow heterogeneous oxidation tower is 1h, after the air flotation treatment, the COD of the effluent is 92mg / L, which meets the national first-class standard for compr...

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Abstract

The invention discloses a method for treating yeast wastewater. The treatment method comprises the following steps: firstly, performing coagulative precipitation pretreatment on wastewater; secondly, performing anaerobic treatment on the pretreated wastewater; thirdly, performing aerobic treatment on the wastewater after the anaerobic treatment; and finally, performing advanced oxidation treatment on the wastewater after the aerobic treatment by a Fenton advanced oxidation method and air floatation. The treatment method has the advantages of simple operation, low treatment expense, high biochemical efficiency, guarantee of up-to-standard water by advanced treatment and the like.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a yeast wastewater treatment method. technical background [0002] The wastewater discharged during yeast production is one of the most polluted and difficult industrial wastewaters. Its high-concentration wastewater mainly comes from the wastewater discharged from centrifugal separation and filtration devices in the yeast fermentation process. The main components are yeast protein, cellulose, colloidal substances, and nutrients in waste molasses that have not been fully utilized, such as residual sugar, etc. Many of them are It is difficult to degrade; in addition to the high concentration of organic matter, the caramel compound in the yeast wastewater makes the color of the yeast wastewater darker, which is dark brown; at the same time, the yeast wastewater also contains microbial metabolites, inorganic salts, and sulfate radicals during the fermentation process. The concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/72C02F1/52
Inventor 陈楠陆立海周永信韦海浪
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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