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Concentrating and phosphorus removing method for excess sludge

A technology for excess sludge and sludge concentration, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of large gravity concentration tank, complex air flotation concentration equipment, and cost of dosing agents High-level problems, to achieve the effect of small footprint, low drug price, and small footprint

Inactive Publication Date: 2015-07-08
烟台亿源环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the volume of excess sludge, further concentration is required to reduce the water content. Concentration methods include gravity concentration, air flotation concentration and mechanical concentration. The gravity concentration tank has a large volume and takes a long time. The air flotation concentration equipment is complex, cumbersome to operate, and high in cost. Mechanical concentration requires high cost of adding chemicals and low efficiency. Due to the long concentration time and the long anaerobic time of the remaining sludge, the sludge releases more phosphorus, so that the phosphorus content in the clear water discharged after concentration is high. The phosphorus removal of the system has a great influence, which is the main shortcoming of the above three concentration methods

Method used

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  • Concentrating and phosphorus removing method for excess sludge
  • Concentrating and phosphorus removing method for excess sludge
  • Concentrating and phosphorus removing method for excess sludge

Examples

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Effect test

Embodiment 1

[0024] like figure 1 Shown, the thickening and dephosphorization method of surplus sludge of the present invention comprises the steps:

[0025] (1) The excess sludge to be treated is the activated sludge mixture discharged from the aeration tank with a concentration of 2 to 5 g / L, and the concentration of the sludge in the excess sludge to be treated and the concentration of the sludge after dehydration are detected. Phosphorus content in clean water: Take an appropriate amount of the remaining sludge mixture to be treated, measure the sludge concentration according to the national standard method (GB / T11901-1989) and measure the phosphorus content in the de-cleaned water according to the national standard method (GB11893-89), Calculate the sludge concentration in the remaining sludge to be treated and the phosphorus content in the clean water;

[0026] (2) Put the remaining sludge to be treated and the compound thickening agent together in a stirring device and stir at 300-...

Embodiment 2

[0033] like figure 1 Shown, the thickening and dephosphorization method of surplus sludge of the present invention comprises the steps:

[0034] (1) The excess sludge to be treated is the excess sludge discharged from the aeration tank and discharged through the secondary settling tank with a concentration of 8-9 grams per liter. The sludge concentration and sludge concentration in the excess sludge to be treated are detected. Phosphorus content in clean water after sludge dehydration: take an appropriate amount of residual sludge mixture to be treated, measure the concentration of sludge according to the national standard method (GB / T11901-1989) and measure the concentration in the dewatered water according to the national standard method (GB11893-89). The phosphorus content is calculated to obtain the sludge concentration in the remaining sludge to be treated and the phosphorus content in the clear water;

[0035] (2) Put the remaining sludge to be treated and the compound ...

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Abstract

The invention discloses a concentrating and phosphorus removing method for excess sludge. The method comprises the following steps: (1) taking appropriate excess sludge mixed liquor to be processed, and determining sludge concentration and the content of phosphorus in clear water; (2) putting the excess sludge to be processed and a mixed concentrating agent into a stirring device for stirring at the sped of 300-330r / min; after uniformly stirring, transferring to a concentrating machine for concentrating to obtain concentrated sludge with the concentration of 40-50g / L, wherein the content of phosphorus in the clear water drained after concentration is smaller than 1mg / L. Compared with the gravity concentration method, the concentrating and phosphorus removing method for the excess sludge has small occupied area and short time. Compared with a mechanical concentrating method, the occupied area is small, the price of drugs is low, and the operation is simple and fast. The content of phosphorus in the clear water drained after concentration is smaller than 1mg / L, and the clear water returning a processing system has a small influence on the phosphorus removal of an integral processing system.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for enriching and removing phosphorus from excess sludge. Background technique [0002] During the aerobic treatment of sewage, one-third of the organic matter is degraded, and two-thirds are synthesized into microorganisms—that is, activated sludge. The activated sludge will continue to increase with the operation of the system. In order to maintain the active sludge in the system Balance, part of the activated sludge needs to be continuously discharged from the system as excess sludge. The remaining sludge flows from the aeration tank to the secondary settling tank for sedimentation, part of the settled sludge flows back to the aeration tank, and part of it is discharged from the system, with a concentration of 7-9 grams per liter and a water content greater than 99%. In order to reduce the volume of excess sludge, further concentration is required to reduce the water c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
Inventor 苏宏张晓杰
Owner 烟台亿源环保科技有限公司
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