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Process for producing carbon source for processing wastewater
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A carbon source, sewage treatment plant technology, applied in sustainable biological treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve the effect of huge quantity, simple process operation and simple operation
Inactive Publication Date: 2010-08-11
TAIYUAN UNIV OF TECH
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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
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Embodiment approach 1
[0020] Embodiment 1: Sequential batch type acid production reactor is adopted, with semi-continuous operation mode, that is, the hydraulic residence time is equal to the biosolids residence time, and the hydraulic residence time is expressed by HRT, which refers to the average residence time of the feed in the reactor. The residence time is expressed by SRT, which refers to the average residence time of microorganisms in the reactor, instantaneous water inflow and instantaneous water outflow, using mechanical stirring, stirring speed 60r / min, stirring mode is intermittent stirring, each interval time is 60min, Stirring time 10min, acid fermentation temperature 37℃, pH5.5, feed VS=22g / L, HRT=3d, oxidation-reduction potential is -130mv, no FeCl is added 3 . It adopts semi-continuous operation mode, stirring before discharging the mixed liquid, and the mud-water mixed liquid is discharged. After this operation mode, a sedimentation tank is added for mud-water separation, and the se...
Embodiment approach 2
[0021] Embodiment 2: The stirring speed is 180r / min, each interval is 40min, the stirring time is 5min, pH 6.0, feed VS=20g / L, HRT=4.4d, oxidation-reduction potential is -110mv, and others are the same as in Embodiment 1.
Embodiment approach 3
[0022] Embodiment 3: Acid 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 in 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 acidicfermentation 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 provides a method for preparing a carbon source for wastewater treatment, belonging to the technical field of environmental protection and wastewater and sludge treatment. Specifically, it is a technical solution for preparing a carbon source for biological treatment of sulfuric acid and hydrochloric mine wastewater by adopting an acid fermentation process. 2. Background technology [0002] In the mining process of sulfide mines, the sulfide contained in it is oxidized to sulfuric acid, which produces a large amount of acid mine wastewater containing high concentration of sulfate. Wastewater contains high concentration of SO 4 2- , But low organic content, in addition to Cu 2+ , Mn 2+ And Fe 2+ And other heavy metal ions. Currently, neutralization, chemical precipitation and electrodialysis methods are mainly used to treat this type of wastewater, but these methods are not economical and may cause secondary pollution. The wetland method c...
Claims
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Application Information
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