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Anaerobic biological treatment method of heat-engine plant desulphurization waste water

An anaerobic biological and desulfurization wastewater technology, applied in anaerobic digestion treatment, gaseous discharge wastewater treatment, waste fuel, etc., can solve the problems of secondary pollution, high treatment cost, and difficult treatment of high-concentration sulfate-containing desulfurization wastewater. , to achieve the effect of saving treatment costs, reducing the concentration of heavy metals, and good operating stability

Inactive Publication Date: 2014-04-23
JILIN ELECTRIC POWER RES INST LTD +2
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Problems solved by technology

[0007] The invention provides a method for anaerobic biological treatment of desulfurization wastewater from thermal power plants to solve the problem of difficult treatment of desulfurization wastewater containing high-concentration sulfate, and overcome the shortcomings of traditional physical and chemical methods such as high processing costs and easy to cause secondary pollution.

Method used

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  • Anaerobic biological treatment method of heat-engine plant desulphurization waste water

Examples

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experiment example 1

[0032] The diagram of the experimental setup is shown in figure 1 , figure 1 Among them, the sulfate reduction reactor is a UASB reactor, made of plexiglass, with a total height of 1300mm and an effective volume of 7.8L. The reactor is composed of two parts: the reaction zone and the settling zone (separation zone). The gas-liquid-solid three-phase separator installed on the upper part of the reactor avoids the installation of sedimentation and separation devices, auxiliary degassing devices and reflux for granular sludge. Sludge equipment simplifies the process and saves investment and operating costs. At the same time, thermal insulation measures were taken for the reactor, and the temperature was kept at 35°C.

[0033] figure 1 Among them, ① is the gas production port; ② is the water outlet; ③ is the sampling port; ④ is the separation area (three separators); ⑤ is the reaction area, the upper part is the sludge layer area, and the lower part is the sludge bed area; ⑥ is ...

experiment example 2

[0037] In this experiment, within the optimum temperature range (25~40°C) of mesophilic anaerobic digestion, the present invention investigated the effect of different temperatures on SO 4 2- effect on removal efficiency. Experimental parameters: SO 4 2- Concentration is 1000mg / L, HRT is 12h, ρ(COD) / ρ(SO 4 2- ) ratio is 3, and the influent pH is 7.

[0038] temperature / ℃ SO 4 2- Removal rate / % 25 63.05 28 70.31 30 78.02 33 84.46 35 86.21 38 80.08 40 74.05

[0039] SO 4 2- The removal rate showed a trend of first increasing and then decreasing with the increase of temperature. When the temperature increased to 35 °C, SO 4 2- The removal rate is the largest, which can reach about 86%; but with the continuous increase of temperature, SO 4 2- The removal rate started to drop. It shows that the growth and metabolism of SRB is the strongest at 35℃, so the maximum sulfate reduction rate is obtained.

experiment example 3

[0041] Different HRTs have different effects on sulfate bioreduction ability, and the present invention reduces HRT from 30h to 6h for SO 4 2- Study on the effect of removal rate, experimental parameters: temperature is 35°C, SO 4 2- The concentration is 1000mg / L, ρ(COD) / ρ(SO 4 2- ) ratio is 3, and the influent pH is 7.

[0042] HRT / h SO 4 2- Removal rate / % 6 54.29 8 68.52 12 87.87 14 89.54 18 90.29 24 90.86 30 90.64

[0043] When HRT drops from 30h to 12h, SO 4 2- The removal rates were all greater than about 87%; when the HRT continued to drop from 12h to 6h, SO 4 2- The removal rate dropped rapidly to 54%. On the basis of ensuring a good treatment effect, considering that shortening the treatment time can effectively reduce the cost of desulfurization wastewater treatment, it can be considered that HRT=12h is the best HRT under this experimental condition.

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Abstract

The invention provides an anaerobic biological treatment method of heat-engine plant desulphurization waste water, and relates to the field of heat-engine plant wet flue gas desulfurization waste water treatment. A sulfate reducing bacteria (SRB) anaerobic biological treatment method is used for treatment of the heat-engine plant desulphurization waste water, SO4<2-> is reduced into H2S by use of SRB, dissolved form S<2-> reacts with heavy metals in the waste water to produce a sulfide precipitate meanwhile to achieve the purposes of removal of the SO4<2-> and the heavy metals in the waste water and improvement of discharged water pH value. By the sulfate reducing bacteria (SRB) anaerobic biological treatment method, up-to-standard release of the SO4<2->, the heavy metals, COD (chemical oxygen demand) and the discharged water pH value of the desulphurization waste water can be realized. The anaerobic biological treatment method is simple in technology process and high in sulfate and heavy metal removal efficiency, and can significantly improve the discharged water pH value, effectively solves the problems of complex operation, high treatment cost, low tendency to cause secondary pollution and the like of a traditional physical and chemical treatment method, and has good economic and environmental benefits.

Description

technical field [0001] The patent of the present invention relates to the field of wet flue gas desulfurization wastewater treatment in thermal power plants, and specifically relates to a method for treating desulfurization wastewater in thermal power plants with SRB anaerobic biological method. Easy to cause secondary pollution and other shortcomings. Background technique [0002] Among various flue gas desulfurization processes, limestone or gypsum wet flue gas desulfurization process has the advantages of mature technology, wide adaptability to coal types, and high desulfurization efficiency. The utilization rate in actual engineering applications has reached more than 85%. However, during the desulfurization process using this method, a certain amount of desulfurization wastewater containing high concentrations of sulfates, sulfites, various heavy metals and suspended solids and a low pH value will inevitably be produced. Due to the special nature of desulfurization was...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F103/18
CPCY02E50/30
Inventor 陈涛孙成勋陈城张丹朱仁伟
Owner JILIN ELECTRIC POWER RES INST LTD
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