CN100344556C - Bioreactor for sewage treatment - Google Patents

Abstract

A bioreactor for sewage treatment, comprising a reactor main body, the upper part of the reactor main body is provided with a water outlet and a tail gas outlet, the lower part of the reactor main body is provided with a water inlet and a compressed air inlet, and the inside of the reactor main body is provided with a solid-liquid separation device, the solid-liquid separation device includes a counterflow pipe and a return pipe, the upper part of the counterflow pipe is connected with the inner cavity of the reactor, the upper part of the backflow pipe is connected with the water outlet pipe, and the water outlet pipe is connected with the water outlet of the reactor; For the return pipe mentioned above, a fender is provided under the deposition chamber, and a gap is left between the deposition chamber and the fender; a mud discharge port is provided at the bottom of the reactor main body. The sewage treatment bioreactor of the present invention reduces the post-processing equipment required in the conventional pressurized biochemical method, adopts a built-in solid-liquid separation device to automatically perform liquid-solid separation, saves subsequent sedimentation treatment, and reduces process flow equipment , reducing operating costs.

Description

A sewage treatment bioreactor

(1) Technical field

The invention relates to a biological reactor for sewage treatment.

(2) Background technology

The traditional aerobic biological treatment method is limited by its oxygen supply capacity, which limits the concentration of microorganisms and treatment efficiency, and is only suitable for low-to-medium concentration organic wastewater. The main reason is that the oxygen supply rate cannot meet the requirements of microorganisms for oxygen, resulting in long residence time, low removal efficiency and low volume load. In the conventional pressurized biochemical method, after the biochemical reaction, the effluent needs to enter the follow-up sedimentation tank for sedimentation treatment to separate the liquid and solid, which increases the follow-up treatment equipment of the reactor.

(3) Contents of the invention

The purpose of the present invention is to provide a sewage treatment bioreactor with a built-in solid-liquid separation device.

The sewage treatment bioreactor of the present invention comprises a reactor main body, the upper part of the reactor main body is provided with a water outlet and the tail gas outlet, the lower part of the reactor main body is provided with a water inlet and a compressed air inlet, and the inside of the reactor main body is provided with A solid-liquid separation device, the solid-liquid separation device includes a counterflow pipe and a return pipe, the upper part of the counterflow pipe is connected to the inner cavity of the reactor, the upper part of the backflow pipe is connected to the water outlet pipe, and the water outlet pipe is connected to the water outlet of the reactor;

A deposition chamber is provided below the counterflow pipe, the deposition chamber communicates with the return pipe, a fender is provided below the deposition chamber, and a gap is left between the deposition chamber and the fender;

The bottom of the main body of the reactor is provided with a sludge outlet.

The solid-liquid separation device of the present invention can be designed in a U-shape or other shapes, but it is most preferable that the return pipe is sleeved on the outside of the reverse flow pipe, and the inside of the return pipe below the reverse flow pipe constitutes the deposition chamber.

The fender can also be used as a diversion device at the same time, when the waste water and air enter from the bottom of the reactor, it can prevent the waste water and air from entering the solid-liquid separation device, thereby ensuring that the muddy water in the solid-liquid separation device is completely separated, separated The final sludge is reused in time to ensure that the wastewater stays in the main body of the reactor for a certain period of time to achieve the purpose of removing organic matter. The fender is preferably a conical baffle.

In order to make the gas distribution in the reactor even, the lower part of the inner cavity of the reactor is preferably equipped with a gas distribution device, and the gas distribution device is connected to the compressed air inlet.

Further, one or more sampling ports are provided in the middle part of the reactor main body.

Still further, the upper part of the reactor main body is provided with a pressure gauge.

Described sewage treatment bioreactor works as follows:

1. Sludge domestication: put the activated sludge into the inner cavity of the reactor, and after a certain period of time, add a certain amount of sewage and a certain proportion of nutrients for domestication and cultivation. After the sludge has a certain activity, carry out Continuous biological oxidation treatment.

2. Pressure biological reaction: The sewage is pumped into the inner cavity of the reactor according to a certain flow rate, and after a certain period of aeration reaction, it overflows to the solid-liquid separation device inside the main body of the reactor. After complete separation, the sludge is self-solidified. The bottom of the liquid separation device flows from the bottom of the reactor to the inner cavity of the external reactor, and the circulation reaction is carried out, and the supernatant liquid flows out from the water outlet arranged on the upper part of the reactor. At the same time, the remaining sludge in the reactor is regularly removed from the sludge outlet.

The sewage treatment bioreactor of the present invention reduces the post-processing equipment required in the conventional pressurized biochemical method, adopts a built-in solid-liquid separation device to automatically perform liquid-solid separation, saves subsequent sedimentation treatment, and reduces process flow equipment , reducing operating costs.

(4) Description of drawings

FIG. 1 is a schematic structural view of the sewage treatment bioreactor described in Example 1.

Fig. 2 is a working schematic diagram of the solid-liquid separation device described in Example 1.

(5) Specific implementation methods

The present invention will be further described below in conjunction with the examples, but the protection scope of the present invention is not limited thereto.

Example 1

Referring to Fig. 1 and Fig. 2, a bioreactor for sewage treatment includes a reactor main body 1, a water outlet 2 and an exhaust gas outlet 3 are provided on the upper part of the reactor main body, and a water inlet 4 and a compressed air inlet 5 are provided on the lower part of the reactor main body 1 , the reactor main body 1 is provided with a solid-liquid separation device inside, the solid-liquid separation device includes a counterflow pipe 6 and a return pipe 7, the upper part of the counterflow pipe 6 communicates with the inner cavity of the reactor, the upper part of the backflow pipe 7 is connected to the outlet pipe 8, and the outlet pipe 8 is connected The reactor water outlet 2; the return pipe 7 is socketed outside the reverse flow pipe 6, and the inside of the return pipe 7 below the reverse flow pipe 6 forms a deposition chamber 9, and the deposition chamber 9 is connected to the return pipe 7; a fender 10 is provided under the deposition chamber 9, There is a gap between the deposition chamber 9 and the fender 10; a mud outlet 11 is provided at the bottom of the reactor main body 1; an air distribution device 12 is provided at the lower part of the reactor inner cavity, and the air distribution device 12 is connected to the compressed air inlet 5; the reactor The middle part of the main body 1 is provided with a sampling port 13; the upper part of the reactor main body 1 is provided with a pressure gauge 14.

Sewage is treated as follows:

1. Sludge domestication stage: Take a certain amount of activated sludge and put it into the inner cavity of the reactor. After a certain period of time, add a certain amount of sewage to maintain the COD in the reactor at a certain concentration (300-1000mg/L). The mud concentration is 3-4g/L, and nutrients are added according to the ratio of C:N:P=100:5:1 for acclimatization and cultivation. When the removal rate of COD in the reactor is greater than 85%, gradually increase the COD in the reactor. COD concentration, after acclimatization for a period of time, microscopic examination shows that the bacteria micelles are dense, transparent in color, and the microbial activities are very active, and they can operate normally at this time.

2. Pressure bioreaction stage: Sewage is poured into the inner cavity of the reactor at a certain flow rate from the water inlet 4, and air is blown in from the compressed air inlet 5 at a certain air flow rate, and the air-water ratio is controlled at 16:1 to 20:1. The pressure is controlled at 0.05-0.8MPa, preferably 0.1-0.2Mpa, and made stable. Aeration reaction in the inner chamber of the reactor for a certain period of time, after the air and sewage are fully contacted and reacted, overflow to the solid-liquid separation device inside the reactor, and the liquid-solid separation is carried out automatically. After complete separation, the sludge flows from the sedimentation chamber 9 To the external reactor cavity, the circulation reaction is carried out, and the supernatant flows out from the water outlet 2 arranged on the upper part of the reactor main body 1 . The remaining sludge in the reactor is regularly removed from the sludge outlet 11.

Claims (6)

1. A bioreactor for sewage treatment, comprising a reactor body, the upper part of the reactor body is provided with a water outlet and an exhaust gas outlet, and the lower part of the reactor body is provided with a water inlet and a compressed air inlet, characterized in that: the reactor body A solid-liquid separation device is provided inside, and the solid-liquid separation device includes a counterflow pipe and a return pipe, the upper part of the counterflow pipe is connected with the inner cavity of the reactor, the upper part of the return pipe is connected with the water outlet pipe, and the water outlet pipe is connected with the water outlet of the reactor; A deposition chamber is provided under the countercurrent pipe, and the deposition chamber communicates with the return pipe. A fender is provided below the deposition chamber, and a gap is left between the deposition chamber and the fender. The return pipe is sleeved on the outside of the reverse flow pipe, and the inside of the return pipe below the reverse flow pipe constitutes the deposition chamber; the bottom of the main body of the reactor is provided with a sludge discharge port. 2. The bioreactor for sewage treatment as claimed in claim 1, characterized in that the fender is a conical baffle. 3. The bioreactor for sewage treatment as claimed in claim 1, characterized in that the lower part of the inner cavity of the reactor is provided with an air distribution device, and the air distribution device is connected to the compressed air inlet. 4. The bioreactor for sewage treatment according to claim 3, characterized in that a sampling port is provided in the middle of the main body of the reactor. 5. The bioreactor for sewage treatment as claimed in claim 4, characterized in that a pressure gauge is provided on the upper part of the main body of the reactor. 6. The sewage treatment bioreactor according to claim 1, characterized in that a pressure gauge is installed on the upper part of the reactor main body.

Images