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Cultivating method for activated sludge for biochemically treating high-temperature salt-containing wastewater

A technology of activated sludge and biochemical treatment, which is applied in the fields of mining wastewater treatment, chemical instruments and methods, biological water/sewage treatment, etc., which can solve the problems of not mentioning the requirements of salinity, inapplicability of high temperature treatment, etc., and achieve salt tolerance High capacity, high efficiency of removing organic matter, and low energy consumption

Active Publication Date: 2015-05-27
BLUESTAR LEHIGH ENG INST CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] By comparing the patent documents, the Chinese published patent document CN1068088A discloses a method for synchronously cultivating activated sludge, but this document still belongs to the domestication and cultivation of activated sludge for industrial sewage treatment at normal temperature, and is not suitable for high temperature treatment
Chinese published patent document CN1257047A discloses a microbial treatment method for alkali slag oil production wastewater polluted by high-concentration organic substances discharged from an oil refinery. The cultured microorganisms are suitable for treating oil production wastewater at 15-40°C, but not at 40°C. The above salty high temperature oil production wastewater
Chinese published patent documents CN 1242935C and CN 1290778C both disclose a method of gradually increasing the temperature for the cultivation of high-temperature wastewater treatment microorganisms, but do not mention the requirements for salt content, especially the mass fraction of salt content (calculated as NaCl) is 10% Salt high temperature oil production wastewater

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  • Cultivating method for activated sludge for biochemically treating high-temperature salt-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1, a kind of activated sludge cultivation method of saline high-temperature wastewater biochemical treatment, the method comprises the following steps:

[0026] (1) Take sludge samples and inoculate them in a culture device at 20°C, and conduct a batch acclimation culture to make the sludge concentration reach 500mg / L;

[0027] (2) Raise the temperature of the culture device to 30°C, carry out the second batch domestication culture, add the domestication nutrient solution and an appropriate amount of actual wastewater, so that the COD concentration of the influent is ≤2000mg / L, and maintain the mass fraction of salt in the wastewater as NaCl ≤10%, the domestication period is 1~7d, when the effluent COD removal rate is ≥90%, the cultivation is terminated, the flocculant is added for flocculation and sedimentation, the supernatant is discarded, and the next stage of cultivation is transferred;

[0028] (3) Raise the temperature of the culture device to 40°C, ca...

Embodiment 2

[0031] Embodiment 2, a kind of activated sludge cultivation method of saline high-temperature wastewater biochemical treatment, the method comprises the following steps:

[0032] (1) Take the sludge sample and inoculate it in a culture device at 30°C, and conduct a batch acclimation culture to make the sludge concentration reach 1500mg / L;

[0033] (2) Raise the temperature of the culture device to 40°C, carry out the second batch domestication culture, add the domestication nutrient solution and an appropriate amount of actual wastewater, so that the COD mass concentration of the influent is ≤2000mg / L, and maintain the mass fraction of salt in the wastewater as NaCl ≤10%, the domestication period is 1~7d, when the effluent COD removal rate is ≥90%, the cultivation is terminated, the flocculant is added for flocculation and sedimentation, the supernatant is discarded, and the next stage of cultivation is transferred;

[0034] (3) Raise the temperature of the culture device to 5...

Embodiment 3

[0037] Embodiment 3, a kind of activated sludge cultivation method of saline high-temperature wastewater biochemical treatment, the method comprises the following steps:

[0038] (1) Take the sludge sample and inoculate it in a culture device at 25°C, and conduct a batch acclimation culture to make the sludge concentration reach 1000mg / L;

[0039] (2) Raise the temperature of the culture device to 35°C, carry out the second batch domestication culture, add the domestication nutrient solution and an appropriate amount of actual wastewater, so that the COD mass concentration of the influent is ≤2000mg / L, and maintain the mass fraction of salt in the wastewater as NaCl ≤10%, the domestication period is 1~7d, when the effluent COD removal rate is ≥90%, the cultivation is terminated, the flocculant is added for flocculation and sedimentation, the supernatant is discarded, and the next stage of cultivation is transferred;

[0040] (3) Raise the temperature of the culture device to 4...

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Abstract

The invention discloses a cultivating method for activated sludge for biochemically treating high-temperature salt-containing wastewater. The method comprises the steps of inoculating a sludge sample from soil in a hot spring, a volcanic basin, a hot area and the like into a 20-30-DEG C cultivating device; cultivating in an intermittent habituated cultivation way and in three stages, namely cultivating at the temperature of 30-40 DEG C for 1-7 days, cultivating at the temperature of 40-50 DEG C for 7-14 days and cultivating at the temperature 50-60 DEG C for 7-14 days; and adding a microbiological stabilizer to obtain the activated sludge for treating high-temperature salt-containing wastewater. The method disclosed by the invention is simple and easy and relatively low in operation energy consumption; the obtained activated sludge has the characteristics of strong salt and temperature tolerance and high organism removing efficiency; a biochemical system constructed by using the activated sludge is strong in stability; the effluent quality is relatively good; the high-temperature salt-containing wastewater can be discharged up to the standard; and the activated sludge can be used for biochemically treating refinery wastewater and oil producing wastewater.

Description

technical field [0001] The invention relates to a method for cultivating microorganisms, in particular to a method for cultivating activated sludge used for treating high-temperature waste water containing salt. Background technique [0002] Salt-containing high-temperature wastewater refers to wastewater with a salinity mass fraction ≥ 1% (measured as NaCl) and a high temperature (generally ≥ 40°C). The wastewater discharged from many industrial production processes, such as oil refining wastewater, oil production wastewater, food wastewater, etc., has a high temperature when discharged, and the temperature is about 40 ° C to 60 ° C. At the same time, the salt content is high, which is corrosive to a certain extent. In the traditional wastewater treatment process, ordinary microorganisms can only be applied to the treatment of wastewater at normal temperature or medium temperature (35°C). If the temperature is ≥35°C, some proteases in the microorganisms will lose their act...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F103/10
CPCC02F3/00C02F2103/10
Inventor 张彬彬李学字田凤蓉杨志林刘德敏王开春胡聪崔庆兰
Owner BLUESTAR LEHIGH ENG INST CO LTD
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