Method for acquiring denitrified carbon source by fermenting surplus sludge

A nitrification denitrification carbon and excess sludge technology, applied in chemical instruments and methods, sludge treatment, sludge treatment, etc., can solve the problems of toxicity, environmental hazards, high cost, etc., achieve low cost, save cost, and facilitate follow-up treatment Effect

Inactive Publication Date: 2011-05-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the denitrification efficiency of methanol is high, its own toxicity will cause potential danger to the environment; although the toxicity of ethanol and acetic acid is not as strong as methanol, but the cost is higher

Method used

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Examples

Experimental program
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specific Embodiment approach 1

[0009] Specific implementation mode 1: In this embodiment, the method for obtaining denitrification and denitrification carbon source by fermentation of excess sludge is carried out according to the following steps: 1. Ultrasonic pretreatment is performed on the excess sludge produced by urban sewage plants for 5 to 10 minutes, and then enters the storage tank , and then added to the fermenter, anaerobic fermentation for 5-7 days under the conditions of temperature 20-30°C and pH value 5.5-6.5; 2. The supernatant produced after step 1 fermentation enters the reaction tank for Aeration, so that the dissolved oxygen concentration is 4 ~ 6mg / L, and then the struvite method is used for treatment, and the effluent of the reaction tank is the denitrification and denitrification carbon source obtained from the fermentation of the remaining sludge; the ultrasonic pretreatment in step 1 uses The ultrasonic power is 5KW; the amount of sludge added to the fermentation tank in step 1 accou...

specific Embodiment approach 2

[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, the remaining sludge produced by the urban sewage plant is carried out ultrasonic pretreatment for 5min, then enters the storage tank, and then is added to the fermenter, at a temperature of Anaerobic fermentation was carried out for 7 days under the conditions of 20°C and pH value of 5.5. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, the remaining sludge produced by the urban sewage plant is subjected to ultrasonic pretreatment for 10 minutes, then enters the storage tank, and then is added to the fermenter, at a temperature of Anaerobic fermentation was carried out for 5 days under the conditions of 30°C and pH value of 6.5. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a method for acquiring a denitrified carbon source, particularly a method for acquiring a denitrified carbon source by fermenting surplus sludge. The method comprises the following steps: 1. carrying out ultrasonic pretreatment on surplus sludge, and fermenting; and 2. aerating the supernatant generated after fermentation, and treating the supernatant by a guano process, wherein effluent water of a reaction tank is the denitrified carbon source acquired by fermenting surplus sludge. The raw material adopted by the method is waste in municipal sewage plants, and therefore, the invention achieves the purpose of changing waste into resources; sludge generated in the sewage plants is treated on the spot to produce a carbon source, thereby saving the transportation expenses; surplus sludge after fermentation is converted into harmless substances, the amount of the sludge is reduced, and the surplus sludge can be further composted or fermented to produce methane or can be landfilled, thereby facilitating the subsequent treatment and lowering the cost; when being used as a carbon source, the generated sludge supernatant has the advantages of high content of short chain fatty acids and high C/N ratio; and the effluent water of the reaction tank can be directly transmitted into a denitrification reaction tank and used as a carbon source.

Description

technical field [0001] The invention relates to a method for obtaining a carbon source for denitrification and denitrification. Background technique [0002] At present, the widely used denitrification process generally adopts the combined process of nitrification and denitrification, which generally includes the alternation of anaerobic, anoxic, and aerobic states in space or time. By adjusting and optimizing the combination of the three states and their quantities The spatio-temporal distribution as well as the reflux mode and position can achieve the purpose of efficient denitrification. Among them, denitrification in the denitrification section requires a large amount of organic matter. Due to the fact that the actual C / N of urban sewage in our country is relatively low, and a part of carbon source is unavoidably consumed in the nitrification section, the needs of denitrifying bacteria are often not met during the denitrification process, and the shortage of organic car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/00C02F9/04
CPCY02W10/10Y02W10/20
Inventor 韩洪军胡宏博马文成王伟王冰李慧强徐春燕李雨霏刘音颂
Owner HARBIN INST OF TECH
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