Method for performing biological denitrification of wastewater by using residual sludge and biological denitrification system for implementing same

A technology for excess sludge and biological denitrification, which is applied in the field of biological denitrification system, can solve the problems that the nitrogen index of the treated water cannot meet the standard, increase the operating cost of the sewage treatment plant, and reduce the denitrification effect of the system, so as to solve the problem of denitrification carbon source Insufficient, reduced processing costs, cost-saving effects

Inactive Publication Date: 2015-06-17
杭州智水水务科技有限公司 +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] Unfortunately, the study found that after water earthworms were introduced into the sewage treatment system, although the reduction of sludge discharge was achieved, the denitrification effect of the system declined.
Ratsak et al. in the Netherlands conducted a research on water earthworm sludge reduction technology with different processes, and found that water earthworms have the effect of sludge reduction in aerobic ponds, but due to the metabolism of water earthworms, a large amount of nitrate is released, making The nitrogen index of the treated water is basically not up to the standard
[0008] However, in order to meet the emission standards of TN, we are faced with the problem of insufficient raw water carbon sources.
Moreover, after being predated by water worms, the remaining sludge has been reduced in volume and quality, and it is difficult to use it again in sewage treatment
Whether it is processing excess sludge or adding external carbon sources will increase the operating costs of sewage treatment plants

Method used

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  • Method for performing biological denitrification of wastewater by using residual sludge and biological denitrification system for implementing same
  • Method for performing biological denitrification of wastewater by using residual sludge and biological denitrification system for implementing same

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Embodiment 1

[0038] Such as figure 1 The wastewater biological denitrification system shown includes anoxic tank, aerobic tank and secondary sedimentation tank connected in sequence. The anoxic tank is equipped with a water inlet, and the anoxic tank is equipped with a stirring device; the bottom of the aerobic tank is equipped with perforated aeration. Hollow plastic balls are hung in the aerobic tank, and filter cloth is installed inside the ball; an internal backflow device is installed between the aerobic tank and the anoxic tank, and the secondary settling tank is equipped with a water outlet and a sludge discharge port. A water quality detector is installed between them; a sludge thickening tank, an ultrasonic processor and an anaerobic fermentation tank are sequentially connected between the sludge outlet and the water inlet.

[0039] In this embodiment, a method for biological denitrification of wastewater using excess sludge is to use figure 1 The implementation of wastewater bio...

Embodiment 2

[0047] In this embodiment, a method for biological denitrification of wastewater by using excess sludge is also used figure 1 The implementation of wastewater biological denitrification system includes the following steps:

[0048] (1) Take domestic sewage from the canal section of Hangzhou City (hereinafter referred to as canal sewage), and feed it into the anoxic pool, with 30L of water in each batch, and control the DO in the anoxic pool to 15mg / L, and the reaction time in the anoxic pool is 2h;

[0049] A hollow plastic ball with a diameter of 7cm is suspended in the aerobic pool, and a 40-mesh filter cloth with a proportion of 70% is installed in the ball. Water earthworms are mounted in the filter cloth, and the loading capacity of water earthworms is 2kg / L canal sewage; DO is 4~6mg / L, after 6 hours of reaction, return the nitrification solution to the anoxic tank, the reflux ratio of the nitrification solution (reflux flow / influent flow) is 100%, when the total nitrogen...

Embodiment 3

[0054] In this embodiment, a method for biological denitrification of wastewater by using excess sludge is also used figure 1 The implementation of wastewater biological denitrification system includes the following steps:

[0055] (1) Take the domestic sewage from the canal section of Hangzhou City (hereinafter referred to as the canal sewage), and feed it into the anoxic pool. Each batch of water intake is 30L. The DO in the anoxic pool is controlled at 0.4mg / L, and the reaction time in the anoxic pool is 2h;

[0056] A hollow plastic ball with a diameter of 7cm is hung in the aerobic pool, and a 40-mesh filter cloth with a proportion of 60% is installed in the ball. Water earthworms are mounted in the filter cloth, and the loading capacity of water earthworms is 2kg / L canal sewage; control the aerobic pool DO is 4~6mg / L, after 6 hours of reaction, return the nitrification solution to the anoxic tank, the reflux ratio of the nitrification solution (reflux flow / influent flow)...

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Abstract

The invention discloses a method for performing biological denitrification on wastewater by using residual sludge and a biological denitrification system for implementing the method. The method comprises the steps of (1) performing sequencing batch internal circulation A / O biological denitrification on the wastewater to be treated, and taking the residual sludge discharged after denitrification; (2) performing ultrasonic treatment on the residual sludge to obtain a sludge mixed solution; (3) performing anaerobic fermentation on the sludge mixed solution to obtain fermentation broth, and refluxing the fermentation froth to the wastewater to be treated; and (4) repeating the steps (1)-(3). A filling material is added in an aerobic tank to improve the degradation efficiency of functional microbes to pollutants; tubificidae are loaded on the filling material to prey active sludge so as to realize effective reduction of the residual sludge; and the discharged residual sludge is further treated to obtain fermentation broth serving as a carbon source, so that an additional carbon source does not need to be added, the problem of insufficient denitrification carbon source is solved, and secondary reduction of the residual sludge is realized.

Description

technical field [0001] The invention belongs to the technical field of excess sludge treatment, and in particular relates to a method for biological denitrification of wastewater by utilizing excess sludge and a biological denitrification system for implementing the method. Background technique [0002] Generally, urban sewage can only remove about 25-30℅ of BOD by sedimentation method 5 , Colloids and dissolved organic matter in sewage cannot be removed by precipitation methods, and chemical methods are not suitable for use because of the high cost of chemicals and the poor effect of chemical coagulation to remove dissolved organic matter. Using biological treatment (activated sludge process) is the most economical and effective option to remove organic matter in wastewater. [0003] Nitrogen in wastewater generally exists in four forms: organic nitrogen, ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen. In the common sequencing batch internal circulation A / O biol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/04C02F101/16
CPCY02W10/20
Inventor 郑旭晨方圆骆椿明屈立宇龙於洋沈东升冯华军
Owner 杭州智水水务科技有限公司
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