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Advanced treatment method of anaerobic effluent of cassava alcoholic waste liquor

A technology of anaerobic effluent and cassava alcohol, which is applied in the field of sewage purification and treatment, can solve the problem of high content of soluble organic matter, and achieve the effects of improving treatment efficiency and energy recovery rate, good application and research prospects, and low cost.

Active Publication Date: 2017-08-18
JIANGNAN UNIV
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  • Abstract
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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a method for the advanced treatment of cassava alcohol waste liquid anaerobic effluent in view of the high content of soluble organic matter in the effluent of the first-stage high-temperature CSTR reactor. The method adopts an upflow anaerobic Oxygen sludge bed reactor UASB, inoculated with granular sludge for mesophilic continuous anaerobic fermentation to produce biogas

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  • Advanced treatment method of anaerobic effluent of cassava alcoholic waste liquor
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  • Advanced treatment method of anaerobic effluent of cassava alcoholic waste liquor

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Experimental program
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Effect test

Embodiment 1

[0033] use figure 1 The upflow anaerobic sludge bed UASB reactor device shown is made of all glass, with a volume of 9.5L and an actual effective reaction volume of 7.2L. The reaction temperature is 35°C, the influent water enters from the bottom of the reactor through a pump, the biogas generated by the reaction is separated by a three-phase separator, and is discharged from the gas discharge pipe to the gas collection bag for collection, and the effluent and influent water are refluxed at a ratio of 2:1. The outside of the reactor is a glass interlayer, and the water bath heating method is used to maintain the temperature at 35°C.

Embodiment 2

[0034] Variation of UASB reactor effluent COD under different operating conditions of embodiment 2

[0035] The operating performance of the UASB reactor is as follows: figure 2 shown. After being treated in the first-stage CSTR anaerobic reactor, the effluent is diluted according to the set corresponding hydraulic retention time and volume load, and then enters the UASB reactor for anaerobic fermentation using a pump. At 3kgCOD / (m 3 .d) Operate under load for 10 days, increase to 5kgCOD / (m 3 .d) Run for 15 days, then increase to 7kgCOD / (m 3 .d) Run 33d. After nearly 60 days of treatment, the final reactor operating load is 7kgCOD / m 3 .d, the concentrations of TCOD and SCOD in the effluent water were 1327.9 and 551.2 mg / L, respectively, and the removal rate of TCOD reached 83.0% to 84.1%. During the treatment process, the concentration of organic matter in the effluent increases with the increase of the influent volume load.

[0036] Such as image 3 As shown, the dail...

Embodiment 3

[0040] Example 3 Kinetic model of CSTR anaerobic reaction biogas production rate under different volume loads

[0041] The operating parameters of the reactor are controlled according to the following kinetic model:

[0042] The establishment of the kinetic model is based on the conservation of materials, then:

[0043]

[0044] In the above formula:

[0045] V R is the volume of the reactor (L); m o is the amount of material added (L / d); C 0 is the concentration of organic matter in the feed material (g / L); c is the concentration of organic matter in the reactor (g / L); r(c) is the rate at which the substrate is digested (g / L.d); y is the unit raw material Gas production rate (L / gTCOD); y m is the maximum unit raw material gas production rate (L / gTCOD);

[0046] According to the first order reaction kinetics:

[0047]

[0048] Among them, k is the first order reaction rate (d -1) .

[0049] According to HRT=m 0 .VR, under steady state conditions, can be obtaine...

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Abstract

The invention discloses an advanced treatment method of anaerobic effluent of cassava alcoholic waste liquor, and belongs to the technical field of wastewater purification treatment. Inoculated sludge is moderate-temperature anaerobic granular sludge in a food processing factory, an upflow anaerobic sludge blanket (UASB) is used as a reactor, the sludge is subjected to continuous anaerobic treatment under the condition of a moderate temperature of 35 DEG C, the fermentation property of the sludge is analyzed, meanwhile, a kinetic model is built to provide optimizing operation parameters for the fermentation process, and a reliable operation management theoretical guidance is provided for treatment of actual cassava alcoholic waste liquor. Anaerobic deep fermentation of the wastewater can produce a lot of marsh gas, the waste liquor of the first-stage high-temperature anaerobic effluent of cassava alcohol can be effectively treated, and detoxifiton, reduction and recycling of the high-concentration organic wastewater are achieved. The method is simple and easy to operate, high in stability, and capable of effectively treating the waste liquor of the first-stage high-temperature anaerobic effluent of the cassava alcohol.

Description

technical field [0001] The invention relates to a method for advanced treatment of cassava alcohol waste liquid anaerobic effluent, and belongs to the technical field of sewage purification treatment. Background technique [0002] According to relevant reports, cassava fuel ethanol will play an increasingly important role in the future energy allocation process. Because the roots and stems of cassava contain a lot of carbohydrates and starch, a large amount of organic wastewater will be generated during the production of ethanol alcohol, which contains a large amount of renewable nutrients, and is a kind of non-toxic and high-concentration organic wastewater. In the production process of cassava fuel ethanol, about 15 tons of alcohol wastewater can be discharged per ton of alcohol. This type of wastewater has the characteristics of high solid content, high COD and low pH, and is a type of industrial high-concentration organic wastewater that is difficult to degrade. Not only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F103/36
CPCC02F3/2846C02F2103/36Y02E50/30
Inventor 赵明星廖家林卞志明阮文权
Owner JIANGNAN UNIV
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