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Process for producing carbon source for processing wastewater

A technology for treating wastewater and carbon sources, applied in the direction of sustainable biological treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., to achieve the effects of high acid production rate, increased production, and high residence time

Inactive Publication Date: 2008-07-16
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is a preparation method of carbon source for treating waste water, the purpose of which is to maximize the utilization of the carbon source material in the sludge of sewage treatment plant and to make the sulfate reduction reactor have the maximum reducing capacity, so as to improve the acidic fermentation of sludge in sewage treatment plant The proportion of short-chain volatile fatty acids that sulfate-reducing bacteria can easily use in the product solves the key problem of biological treatment of acidic mine wastewater, effectively reduces the cost of biological treatment of acidic mine wastewater, and discloses a method for preparing and treating sulfate-containing acidic wastewater by using an acidic fermentation process. Technical solution for carbon source of mine wastewater

Method used

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Examples

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Effect test

Embodiment approach 1

[0020] Embodiment 1: Adopt the sequential batch type acid production reactor, adopt the semi-continuous operation mode, that is, the hydraulic retention time is equal to the biological solid residence time, and the hydraulic retention time is represented by HRT, which refers to the average residence time of the feed in the reactor, and the biological solid The residence time is represented by SRT, which refers to the average residence time of the microorganisms in the reactor, instantaneous water inflow and instantaneous water outlet, mechanical stirring is adopted, the stirring speed is 60r / min, the stirring method is intermittent stirring, and the interval time is 60min, Stirring time 10min, acidogenic fermentation temperature 37°C, pH 5.5, feed VS = 22g / L, HRT = 3d, redox potential -130mv, no FeCl 3 . The semi-continuous operation mode is adopted, and the mixed liquid must be stirred before being discharged, and the mud-water mixed liquid is discharged. After this operation...

Embodiment approach 2

[0021] Embodiment 2: Stirring speed is 180r / min, every interval is 40min, stirring time is 5min, pH6.0, feed VS=20g / L, HRT=4.4d, redox potential is-110mv, others are the same as Embodiment 1.

Embodiment approach 3

[0022] Embodiment 3: Acidogenic fermentation temperature is 38°C, stirring speed is 120r / min, every interval is 50min, stirring time is 7min, pH6.5, feed VS=18g / L, HRT=3d, redox potential is -120mv, Others are the same as Embodiment 1.

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Abstract

The invention relates to a preparation method of carbon resource for treating wastewater, which belongs to the technical fields of environmental protection, the wastewater and sludge treatment.The invention is characterized in that the acidic fermentation preparation process is used for treating the carbon source of mine wastewater with sulfate and hydrochloric acid, which makes the sludge acidic fermentation products contain 42 percent-85 percent of propionic acid, 5 percent-18 percent of acetic acid and 10 percent-40 percent of butyrate, so the short chain fatty acid is unnecessary to be extracted from supernatant of acidic fermentation reactor; the supernatant of the acidic fermentation reactor is used as the carbon source of sulfate reducing bacteria and directly added into the mine wastewater with the sulfate and the hydrochloric acid and the obtained; the invention solves the key difficult problem that a biological method is used for treating the acidic mine wastewater. The sludge acidic fermentation process has simple operation and the fermentation products, propionic acid, acetic acid and butyrate, can be used as low cost carbon sources for treating acidic mine wastewater biologically; at the same time, the process achieves the quantity reduction, resource utilization and stabilization of the sludge.

Description

1. Technical field [0001] The invention discloses a method for preparing a carbon source for treating waste water, which belongs to the technical field of environmental protection and waste water and sludge treatment. Specifically, it is a technical scheme for preparing a carbon source for biologically treating sulfate-containing acidic mine wastewater by using an acidic fermentation process. 2. Background technology [0002] During the mining process of sulfidic mines, the sulfides contained in them are oxidized to sulfuric acid to produce a large amount of acid mine wastewater containing high concentrations of sulfates. Wastewater contains high concentrations of SO 4 2- , but the content of organic matter is low, and it also contains Cu 2+ , Mn 2+ and Fe 2+ and other heavy metal ions. At present, neutralization, chemical precipitation and electrodialysis are mainly used to treat this kind of wastewater, but these methods are very uneconomical and cause secondary poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/12C02F1/70
CPCY02W10/10
Inventor 李亚新宋秀兰苏冰琴
Owner TAIYUAN UNIV OF TECH
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