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A spiral bed biofilm reactor for sewage treatment

A biofilm reactor and sewage treatment technology, applied in the fields of environmental engineering and chemical engineering, can solve the problems of uneven distribution, local carrier accumulation and insufficient liquid mixing, so as to ensure the circulation rate and facilitate the gas-liquid mass transfer rate , The effect of reducing the loss of vertical pressure head

Active Publication Date: 2020-06-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of the moving bed biofilm reactor is that the carrier in the reactor is in a fluidized state by the lifting effect of aeration and water flow, but in actual operation, it often occurs that local carrier buildup and poor fluid mixing
The depth of the moving bed bioreactor is generally 2-6 meters. Although the oxygen transfer efficiency per meter depth is higher than that of the activated sludge reaction tank, it is still relatively low, about 1.0-2.5% / m

Method used

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  • A spiral bed biofilm reactor for sewage treatment
  • A spiral bed biofilm reactor for sewage treatment
  • A spiral bed biofilm reactor for sewage treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: spiral bed biofilm reactor

[0054] like Figure 1~5 As shown, a spiral bed biofilm reactor for sewage treatment includes a reaction tank 1, a draft tube 14, an empty channel 3 and a carrier channel 2; the inner space of the tank 1 includes a gas-liquid mixing zone and is located in the gas The gas-liquid separation zone 19 above the liquid mixing zone; the gas-liquid separation zone 19 refers to the area above the liquid level in the reactor, including the area where the foam is located; the gas-liquid mixing zone is the area below the liquid level; the tank body 1 The top of the tank is provided with an exhaust port 11, the bottom is provided with a mud discharge port 15, and a water outlet 13 and a water inlet 12 are arranged on the side wall of the tank body 1; the water inlet 12 is located near the top of the draft tube, and the water outlet 13 is located at the water inlet 12 above; the guide tube 14 is coaxially arranged with the tank body 1, and t...

Embodiment 2

[0076] Example 2: 200L spiral bed biofilm reactor

[0077] Such as Figure 4~6 As shown, a spiral bed biofilm reactor filled with a carrier, the basic structure is similar to that of Example 1, the difference is that the inner diameter of the reaction tank corresponding to the gas-liquid separation zone 19 is the same as that of the reaction tank corresponding to the gas-liquid mixing zone The inner diameter of the body is the same.

[0078] The inner diameter of the reaction tank 1 is 370 mm, the cylinder height is 2260 mm, the lower part is an elliptical steel head, and the upper part is open. The outer diameter of the diversion cylinder 14 is 160mm, the height is 1500mm, and the thickness is 5mm. The bottom of the diversion cylinder 14 is 80mm from the lower edge of the cylinder of the reaction tank, and is supported on the bottom of the reaction tank by 3 legs. Body 10 is installed coaxially. Sewage is directly passed into the upper part of the guide tube 14 through the...

Embodiment 3

[0086] Embodiment 3: Aerobic aeration effect of spiral bed biofilm reactor

[0087] Taking the spiral bed biofilm reactor described in Example 2 as the implementation device, the aerobic biological treatment performance test of sewage was carried out, and compared with the activated sludge method.

[0088] The inoculum sludge comes from the secondary sedimentation tank of a municipal sewage treatment plant in Jiangsu. The concentration of the initial inoculum sludge in the reactor is 5800 mg / L mixed liquid suspended solids (MLSS). The feed liquid is synthetic sewage, composed of: glucose (500mg / L), NH 4 Cl (270mg / L), KH 2 PO 4 (44mg / L), MgSO 4 ·5H 2 O (20mg / L), CaCl 2 (10mg / L), FeSO 4 (2.5mg / L), CuSO 4 ·5H 2 O (0.39mg / L), MnCl 2 4H 2 O (0.28mg / L), prepared from tap water, pH 6.8-7.0.

[0089] Taking the airlift reactor as a comparison, there is no spiral screen and carrier in the airlift reactor, and the size of the reaction vessel is the same as that of the spiral ...

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Abstract

The disclosure herein relates to a helical bed biofilm reactor for wastewater treatment, and belongs to the fields of environment engineering and chemical engineering. The helical bed biofilm reactor comprises a reaction vessel, a draft tube, helical screen meshes, carriers, a carrier passage, a gas distributor, a gas inlet, a gas outlet, a water inlet, a water outlet and a sludge outlet. By improving the arrangement structure of the carriers and the structure of the helical passage, the helical bed biofilm reactor improves the oxygen transfer rate, the oxygen transfer efficiency and the biological reaction efficiency of a biological treatment process of wastewater, and helps to control the thickness of the biofilm and reduce energy consumption in wastewater treatment.

Description

technical field [0001] The invention relates to a spiral bed biofilm reactor used for sewage treatment, belonging to the fields of environmental engineering and chemical engineering. Background technique [0002] Aeration is an essential and most energy-intensive operating unit in the sewage aerobic biological treatment process, accounting for 50-80% of the total energy consumption of sewage treatment plants and 1% of the total electricity consumption in some countries. But in the biological aeration reactor, only 2-10% of the oxygen is effectively absorbed and utilized by microorganisms. How to save energy has become an urgent concern of modern sewage biological treatment. Improving the oxygen transfer rate, oxygen transfer efficiency and microbial reaction efficiency is the main way to solve this problem. It needs to be considered from the perspectives of bioreactor, microbial population, treatment process and metabolic reaction mechanism. Explore. Biofilm treatment of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/10
CPCC02F3/10C02F3/109C02F3/1236C02F3/02C02F3/101C02F3/208C02F2301/026Y02W10/10C02F3/20
Inventor 郑志永王子凡刘和
Owner JIANGNAN UNIV
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