Reduction method for biological sludge

A biological sludge and sludge technology, which is applied in biological sludge treatment, chemical instruments and methods, sludge treatment, etc., can solve the problems of difficulty in breaking microbial cell walls, high energy consumption, and high cost, and reduce sludge production The effect of increasing the amount, increasing the contact area, and improving the effect

Active Publication Date: 2010-07-28
江苏乐尔环境科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty of breaking the microbial cell wall, it

Method used

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  • Reduction method for biological sludge
  • Reduction method for biological sludge
  • Reduction method for biological sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The remaining sludge discharged from the final sedimentation tank is heated to a temperature of 100°C, and the non-ionic surfactant TW-80 is added first, and the dosage is 10 mg / l, which is left for 30 minutes, and then Ca(OH) is added. 2 The pH value of the liquid was adjusted to 9, and it was kept at 100°C for 15 minutes. After the above treatment, the SCOD / TCOD value of the sludge was measured to be 0.94, which was close to completely breaking the wall.

Embodiment 2

[0024] Add the anionic surfactant sodium dodecylbenzoate to the remaining sludge discharged from the final sedimentation tank, the dosage is 500mg / l, let it stand for 15 minutes, then add KOH liquid to adjust the pH value to 10, and send it to the ultrasonic reaction device at 1.34W / cm 2 Sludge wall breaking was carried out for 3 minutes under the sound energy density. The SCOD value obtained after the completion of wall breaking was 3126mg / L, while the SCOD value obtained by ultrasonication for 10 minutes was 3216mg / L when the pH value was 10 but no surfactant was added, and the two remained basically the same. Under the condition of achieving the same lysis effect, ultrasonic is costly and produces noise pollution, while adding surfactant is more economical and convenient.

Embodiment 3

[0026] Send the sludge discharged from the final sedimentation tank to the sludge pretreatment tank for aeration, control the dissolved oxygen at about 4.5mg / l, and aerate for 15 minutes. Then add cationic surfactant benzalkonium chloride, the dosage is 200mg / l, and the standing time is 30 minutes, and then add NaOH liquid to adjust the pH value to 11. Results Compared with the system without aeration, under the condition of the same wall-breaking effect, the amount of alkali is reduced by 35%, and the operating cost is reduced.

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Abstract

The invention relates to a reduction method for biological sludge, which comprise the following steps: adding a Tween surfactant into the sludge for carrying out cell wall breaking on the remaining sludge, wherein the added amount of the surfactant is 10 to 500 mg/l; and adding alkali and adjusting the pH value to be between 9 and 13, the temperature to be between 10 and 100 DEG C and the processing time to be between 15 and 300 minutes. The method improves the wall breaking effect and reduces the wall breaking cost, and greatly reduces the cell dissolving cost of the sludge with small investment. By returning the biological sludge subjected to cell dissolving to an anaerobic or anoxic tank for carrying out anaerobic-anoxic-aerobic denitrification and phosphorous removal processes, the method not only can reduce the sludge production, but also provide carbon sources for denitrification and phosphorous removal, thereby improving the denitrification and phosphorous removal efficiency.

Description

technical field [0001] The invention relates to a treatment method of biological sludge, which belongs to the reduction method of biological sludge in the field of water treatment. Background technique [0002] With the increasing eutrophication of water bodies, many countries have formulated increasingly stringent nitrogen and phosphorus discharge standards. However, most sewage plants operate in a low-carbon source environment, and when the carbon source is too low, the conventional anaerobic-anoxic-aerobic biological treatment process is often difficult to meet the requirements of efficient nitrogen and phosphorus removal at the same time. To further increase the removal rate of nitrogen, it is necessary to supplement the carbon source. However, due to the inherent nature of raw water, the amount of water to be treated is large, and the addition of carbon sources will inevitably increase the cost. Therefore, efficient nitrogen and phosphorus removal from raw water with l...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/02C02F3/30
CPCY02W10/20
Inventor 张书延张云霞王雅丽
Owner 江苏乐尔环境科技股份有限公司
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