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Pretreatment method of molasses alcohol wastewater

A technology for the pretreatment of molasses alcohol wastewater, which is applied in the fields of food industry wastewater treatment, water/sewage treatment, natural water treatment, etc., can solve the problems affecting the practical effect of the concentration combustion method, and achieve the improvement of fluid mechanics and heat transfer characteristics, and reduce the load, and the effect of ensuring up-to-standard discharge

Active Publication Date: 2018-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These problems directly affect the practical effect of the concentrated combustion method

Method used

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  • Pretreatment method of molasses alcohol wastewater
  • Pretreatment method of molasses alcohol wastewater
  • Pretreatment method of molasses alcohol wastewater

Examples

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Effect test

Embodiment 1

[0039] In this embodiment, a pretreatment method for molasses alcohol wastewater is provided. The pretreatment object in this embodiment is taken from the molasses alcohol wastewater produced by domestic alcohol production plants using molasses as raw material to produce alcohol. The main water quality indicators are: pH4.2, COD Cr 110416mg / L, total sugar content 21068mg / L, ethanol content 0.1%, n-propanol content 0.045%, isopropanol content 0.015%, solid suspended matter content 12640mg / L.

[0040] Including the following process steps:

[0041] (1) The molasses alcohol wastewater enters the gravity settling tank and is treated with the flocculant fed by the metering pump for flocculation and sedimentation. The amount of flocculant polyacrylamide added by metering pump is 2g / m 3 The waste water and flocculant are put into the circular gravity settling tank through the concentric circle distributor. The bottom of the gravity sedimentation tank is a cone, which is convenien...

Embodiment 2

[0047] In this embodiment, a pretreatment method for molasses alcohol wastewater is provided. The pretreatment object in this embodiment is the molasses alcohol wastewater produced by domestic alcohol production plants using molasses as raw material to produce alcohol. The wastewater is brown-black liquid, and the water quality indicators are: pH4.2, COD Cr 111024mg / L, total sugar content 21214mg / L, ethanol content 0.11%, n-propanol content 0.043%, isopropanol content 0.015%, solid suspended matter content 12742mg / L. Including the following process steps:

[0048] (1) The molasses alcohol wastewater enters the gravity settling tank and is treated with the flocculant fed by the metering pump for flocculation and sedimentation. The amount of flocculant polyacrylamide added by the metering pump is 2.3g / m 3 The waste water and flocculant are put into the circular gravity settling tank through the concentric circle distributor. The bottom of the gravity sedimentation tank is a...

Embodiment 3

[0054] In this embodiment, a pretreatment method for molasses alcohol wastewater is provided. The pretreatment object in this embodiment is taken from the molasses alcohol wastewater produced by the domestic alcohol production plant using molasses as raw material to produce alcohol. The main water quality indicators are: pH 4.1, COD Cr 108962mg / L, total sugar content 20536mg / L, ethanol content 0.1%, n-propanol content 0.042%, isopropanol content 0.014%, solid suspended matter content 11657mg / L.

[0055] Including the following process steps:

[0056] (1) The molasses alcohol wastewater enters the gravity settling tank and is treated with the flocculant fed by the metering pump for flocculation and sedimentation. The amount of flocculant polyacrylamide added by metering pump is 3g / m 3 The waste water and flocculant are put into the circular gravity settling tank through the concentric circle distributor. The bottom of the gravity sedimentation tank is a cone, which is conve...

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Abstract

The invention belongs to the technical field of industrial sewage treatment, and discloses a pretreatment method of molasses alcohol wastewater. The pretreatment method comprises the steps of performing sedimentation, filtration and rectification pretreatment on the molasses alcohol wastewater; and specifically comprises the following steps: (1) sedimentation: the molasses alcohol wastewater is added into a gravity sedimentation pool, and a flocculating agent is put into the pool through a concentric circle distributor, the wastewater after the flocculation and gravity sedimentation treatmentis filtered through a filter and then subjected to microfiltration treatment through a membrane separation device; and (2) rectification: after the microfiltration treatment, the wastewater enters a rectification tower for rectification to obtain a tower top product and a tower bottom product which are subjected to subsequent processing separately. According to the pretreatment method, the separation efficiency is high, the stability is good, the pertinence is high, colloids, flocculates and other solid particles in the wastewater can be effectively removed, light components in the wastewatercan be well separated and recovered, and load of the subsequent treatment process can be effectively reduced, thereby ensuring that the wastewater is finally discharged up to standards, therefore, thepretreatment method is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, in particular to a pretreatment method for molasses alcohol wastewater. Background technique [0002] Molasses alcohol wastewater is an associated product in the process of molasses fermentation to produce alcohol. For every ton of alcohol produced, about 10 to 15 tons of wastewater are produced. ~60000mg / L, pH 3~4.5. Its large amount, complex composition, strong acidity, and deep color have caused serious harm to the environment, and its treatment technology has become a bottleneck restricting the development of the alcohol industry. At present, the treatment methods of molasses alcohol wastewater mainly include biological method and physicochemical method. The concentrated combustion method in the physical and chemical method evaporates and concentrates the molasses alcohol wastewater, sends the concentrated liquid to the boiler for combustion, and returns the heat generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/32
CPCC02F1/001C02F1/04C02F1/444C02F1/56C02F9/00C02F2001/007C02F2103/325C02F2301/066C02F2303/10
Inventor 陈砺韦美姣严宗诚
Owner SOUTH CHINA UNIV OF TECH
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