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Process for treating waste water by aerobic-anaerobic microbic repeated coupling

An anaerobic microorganism and new process technology, which is applied in the new process field of aerobic-anaerobic microbial repeated coupling treatment of sewage, can solve the problems of device blockage, biofilm easy to fall off, weak denitrification function, etc., achieve efficient removal and save foundation The effect of construction and operating costs

Active Publication Date: 2004-12-15
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a fixed bed, due to the smaller fluid shear force, a biofilm with a higher concentration can be formed than in a fluidized bed. However, although the surface of the filler currently used can absorb microorganisms, the filler will lose weight over time in the process of sewage treatment. The biofilm on the surface is easy to fall off, causing blockage in the device, which limits the popularization and application of this technology
Due to the uneven distribution of dissolved oxygen in the reactor, most of the dissolved oxygen is used by organic matter oxidizing microorganisms, which is not conducive to the generation of nitrification reaction, so the denitrification function of the device is very weak under normal operating conditions

Method used

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  • Process for treating waste water by aerobic-anaerobic microbic repeated coupling
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  • Process for treating waste water by aerobic-anaerobic microbic repeated coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Experimental conditions:

[0018]

[0019] When the residence time of the fluidized bed is 2h and the residence time of the fixed bed is 11h, for the COD of the influent Gr In 500-600mg / L, ammonia nitrogen 20-25mg / L synthetic wastewater, after 160 days of continuous operation, the removal of organic matter can reach 85-99%, the removal of ammonia nitrogen can reach 35%, and the removal of total nitrogen It can reach 20% to 30%. COD of effluent Gr <60mg / L, suspended solids (SS) in effluent <20mg / L, pH between 7-8. The COD, ammonia nitrogen, SS and pH in the treated water all meet the national first-level discharge standards.

Embodiment 2

[0021] Experimental conditions:

[0022]

[0023] When the residence time of the fluidized bed is increased to 4h and the residence time of the fixed bed is still 11h, the COD of the influent Gr In 500-600mg / L, ammonia nitrogen is 20-25mg / L synthetic wastewater, after 110 days of continuous operation, it shows that the removal efficiency of organic matter is 85-99%, and the removal efficiency of ammonia nitrogen can reach 40-50%. Nitrogen removal can reach about 45%. COD of effluent Gr <40mg / L, effluent suspended solids (SS) <20mg / L, pH between 7-8. The COD, ammonia nitrogen, SS and pH in the treated water all meet the national first-level discharge standards.

Embodiment 3

[0025] Experimental conditions:

[0026]

[0027] Controlling the residence time, the inlet concentration of COD and ammonia nitrogen is the same as in Example 2, except that the liquid at the outlet of the fixed bed is returned to the inlet of the fixed bed with a constant flow pump. The main purpose is to increase the residence time and the distance of the wastewater in the reactor. The effect of the fixed bed flow-down distance on the treatment effect. After 30 days of continuous operation, it shows that the removal efficiency of organic matter has declined, but it is also higher than 70%. The main reason is that the reflux increases the horizontal movement of microorganisms in the fixed bed, and the dead microorganisms also increase; the removal efficiency of ammonia nitrogen is reduced. The improvement can reach 40-70%, the removal of total nitrogen can reach 50%-70%, and the COD of effluent Gr Between 110-120mg / L, suspended solids (SS) in effluent water between 20-60...

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Abstract

The present invention belongs to the field of waste water treating technology, and is especially repeated aerobic-anaerobic microbe coupling process of treating waste water in environment protection. Biological fluidizing beds and biological fixed beds are connected serially with overflow partition boards and added with two different kinds of porous biological carriers. Via repeated aerobic-anaerobic microbe coupling in different layers, the present invention disposes organic matter and nitrogen compound in waste water while in-situ decomposing sludge. The present invention realizes the effective elimination of organic matter and nitrogen in waste water, the forced separation of the solid particles from water in the fixed beds and the digestion, degradation and final complete decomposition of solid matter. The present invention has high efficiency, low power consumption and low running cost.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a new process for repeatedly coupling aerobic-anaerobic microorganisms to treat sewage by combining a three-phase biological fluidized bed and a biological fixed bed in environmental protection. Background technique [0002] With the development of society and economy, the discharge of urban sewage, industrial wastewater and runoff sewage is increasing, which has caused huge pressure on water environment protection. At present, the sewage treatment method is mainly biological method, which is divided into activated sludge method and biofilm method. About 80% of the world's sewage treatment plants use the activated sludge method. The basic principle of the activated sludge method is to use the naturally occurring microbial communities in the sewage to oxidize and decompose the dissolved organic matter, and then form flocs under the action of its own floc...

Claims

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Application Information

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IPC IPC(8): C02F1/74C02F3/10C02F3/30C02F11/02
CPCY02W10/10Y02W10/20
Inventor 邢新会冯权娄恺罗明芳
Owner TSINGHUA UNIV
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