Method for rapidly starting short-cut nitrification of domestic sewage

A technology of domestic sewage and short-range nitrification, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., to achieve the effect of easy implementation, strong operability and stable operation effect.

Active Publication Date: 2022-07-12
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN108793402A discloses a method of using iron ferric oxide nanoparticles to strengthen anaerobic reactor to degrade phenol pollutants. This method improves the removal rate of phenol pollutants, but does not involve the impact of denitrification efficiency and denitrification products
CN101462793A discloses a method for the denitrification and dephosphorization of activated sludge sewage by compound iron enzymatically. The electron transfer chain and enzymatic action are strengthened by iron ions, thereby improving the denitrification and dephosphorization efficiency of activated sludge. This method is mainly aimed at increasing the system load , to enhance system stability, no relevant research on short-range nitrification

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  • Method for rapidly starting short-cut nitrification of domestic sewage
  • Method for rapidly starting short-cut nitrification of domestic sewage
  • Method for rapidly starting short-cut nitrification of domestic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The domestic sewage short-range nitrification system 2 adopts a sequencing batch reactor, which is made of plexiglass, with an effective volume of 6L and a drainage ratio of 50%. , release the air with a microporous aeration hose. The water is fed by the micro submersible sewage pump (inlet pump 3), and the water is discharged by the electric ball valve (drain valve 7), which is automatically controlled by the time-controlled switch.

[0048] The inoculated activated sludge comes from the biological reaction tank of a municipal sewage treatment plant. After several washes, the recovered sludge is inoculated into the domestic sewage short-range nitrification system 2, and the sludge concentration is about 3000mg / L. During operation, the temperature was a low temperature of 8 to 16°C, and the pH was 7.0 to 8.5.

[0049] During the test, the actual domestic sewage was used, and the water quality characteristics are shown in Table 1:

[0050] Table 1 Water quality charact...

Embodiment 2

[0057] The experimental system parameters and environmental conditions are the same as those in Example 1.

[0058] After the activity of the sludge is restored to the normal level by aeration, under the condition of low temperature, the domestic sewage is sent from the domestic sewage raw water tank 1 through the inlet pump 3 into the domestic sewage short-range nitrification system 2, and at the same time, the domestic sewage is sent to the domestic sewage short-range nitrification system 2. Add ferric chloride inside, according to 145mgFeCl 3 / g MLSS (mixed liquid sludge concentration) was added, and the total added mass of ferric chloride was 2.8g.

[0059] After the water inflow ends, turn on the aeration pump 4, and control the dissolved oxygen at 8 mg / L through the flow meter 5; the single-cycle operation mode is as follows: the total cycle time is 360 minutes; the water inflow time is 5 minutes, and the water inflow flow rate is 1.5L / min; 240min, the aeration rate is ...

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Abstract

A method for quickly starting short-cut nitrification of domestic sewage comprises the following steps: (1) inoculating nitrification sludge into a short-cut nitrification system of the domestic sewage to enable the sludge concentration to be 2500-3500 mg / L; (2) recovering the metabolic activity of the inoculated sludge in a domestic sewage short-cut nitrification system under a low-temperature condition to complete activity recovery; (3) mixing the ferric oxide nano-particles or ferric trichloride with the domestic sewage under a low-temperature condition to enter a domestic sewage short-cut nitrification system, and starting and operating the system; (4) carrying out sequencing batch reaction, carrying out aeration after water feeding is finished, and respectively adding the ferric oxide nanoparticles or ferric trichloride according to a certain adding frequency; and (5) monitoring the nitrite accumulation rate of the effluent, and when the nitrite accumulation rate reaches 75% or above and stable operation is carried out for 7 days or above, considering that the short-cut nitrification system is successfully started. The sludge settling performance can be remarkably improved, the process control condition is simple, the operation cost is low, the operability is high, and the operation effect is stable.

Description

technical field [0001] The invention relates to a method for starting a short-range nitrification system of domestic sewage, especially suitable for starting a short-range nitrification system using domestic sewage with low ammonia nitrogen content as a substrate, and belongs to the technical field of sewage biological treatment. Background technique [0002] Traditional sewage treatment plants have problems such as high energy consumption and low treatment efficiency. It is imperative to develop new green and low-carbon sewage treatment processes. The anammox process is a new type of sewage treatment process that uses ammonia as the electron donor and nitrate or nitrite as the electron acceptor under anaerobic conditions to generate nitrogen. Compared with the traditional nitrification and denitrification process, the anammox process saves 60% of the oxygen supply, does not need to add organic carbon sources, and has less excess sludge, so this process has attracted extensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/12
CPCC02F3/1263C02F3/02C02F2305/06C02F2305/08C02F2209/08C02F2209/14C02F2209/44C02F2209/22C02F2203/004Y02W10/10
Inventor 潘凯玲邱晨沈鲁滨魏钰轩毕学军程丽华
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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