CROSS REFERENCE TO RELATED APPLICATION

This is a national stage application of PCT/CN2019/094762, filed Jul. 4, 2019, which claims priority to CN 201910544409.2 filed Jun. 21, 2019. The subject matter of this earlier filed application is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a technical field of wastewater treatment equipment, in particular, to a high-concentration organic wastewater treatment reactor.

BACKGROUND

At present, methods of treating high-concentration organic wastewater include physical, chemical and biological methods. Among them, the physicochemical method and the chemical method have the characteristics of low removal efficiency and high treating cost and so on, and the chemicals introduced by the chemical method further forms secondary pollutants. Anaerobic technology is a biochemical treatment technology commonly used in the treatment of high-concentration organic wastewater, which is also the most economical technology for treating the high-concentration organic wastewater at present. The anaerobic technology also generates additional benefits while treating pollutants, which brings great advantages to humans in treating wastewater. Therefore, people have been working hard to develop new anaerobic technology and develop anaerobic reactors with more advantages. The anaerobic technology is a process in which organic matters in wastewater are transformed into substances such as methane, carbon dioxide and so on by microorganisms in sludge. Therefore, whether the wastewater and sludge are fully mixed is essential to the removal of organic matters. There are many methods for internal mixing of sludge and wastewater generally used in anaerobic reactors: (1) utilizing the biogas produced by itself and influent water to agitate without providing a mixing equipment. Such reactor has short-flow phenomenon therein, which affects the treating capacity, has a long startup time and is sensitive to sudden changes in water quality and load; (2) utilizing external circulating water to agitate to mix the sludge and wastewater, which is achieved by sending the water at the top of the reactor or the effluent water to the lower part of the reactor by a circulating pump to increase ascending flow rate. Such mixing method requires external power, and has high energy consumption and a dead zone; and (3) mechanical agitating, which is achieved by utilizing a motor provided at the top of the reactor to drive an agitator blade provided at the bottom of the reactor to agitate, and the agitator blade being connected to the motor by a connecting shaft. However, such method has high energy consumption, large vibration and noise, and the anaerobic reactor is usually high, and thus the connecting shaft will be too long, resulting in that it is easy to malfunction.

Therefore, currently, most of the devices used in high-concentration organic wastewater treatment projects have problems such as low treatment efficiency, high energy consumption, low organic load, uneven water distribution, weak resistance to impact load and the like.

SUMMARY

The technical problems to be solved by the present invention is to provide a high-concentration organic wastewater treatment reactor, which has advantages of low energy consumption, high removal efficiency, good effluent water quality, large biogas production, and no odor, and can overcome the problems existing in conventional devices.

The present invention solves the above technical problems with the following technical solutions:

A high-concentration organic wastewater treatment reactor of the present invention includes a reactor body. A lower water distribution system, an upper water distribution system, a lower three-phase separator and an upper inclined plate separator are provided from bottom to top in the reactor body. A gas-liquid separator is disposed on the top of the reactor body. The lower water distribution system and the upper water distribution system are both connected to an influent pipe. A lower biogas ascending pipe connected to the gas-liquid separator is disposed on the top of the lower three-phase separator. An upper biogas ascending pipe and an effluent pipe are disposed above the upper inclined plate separator. An outlet end of the upper biogas ascending pipe is connected to the gas-liquid separator. A high-load reaction zone is formed between the lower water distribution system and the lower three-phase separator. A low-load reaction zone is formed between the lower three-phase separator and the upper inclined plate separator. A downcomer extending into the high-load reaction zone is disposed on the bottom of the gas-liquid separator. An air pipe is disposed on the top of the gas-liquid separator.

A cyclone separator is connected to an outlet end of the effluent pipe of the present invention, so as to further carry out sludge-water separation.

The lower water distribution system of the present invention includes a lower water distribution pipe and a water distribution hood. The lower water distribution pipe is located below the water distribution hood. The lower water distribution pipe is provided with effluent holes. The wastewater entering into the lower water distribution pipe is sprayed out through the effluent holes, and forms an ascending swirl after passing through the water distribution hood.

The upper water distribution system of the present invention includes: an upper water distribution main pipe surrounding the outside of the reactor body; and a plurality of water distribution branch pipes, each of which has one end connected to the upper water distribution main pipe and another end extending into the reactor body and connected to a nozzle, and a plurality of nozzles are sprayed in the tangential direction of the same concentric circle.

Four water distribution branch pipes of the present invention are provided and evenly arranged, and the plurality of nozzles connected to the water distribution branch pipes are arranged in a horizontal direction.

The reactor body of the present invention is a full sealed reactor.

The lower water distribution system and the upper water distribution system of the present invention are made of stainless-steel material, and are both mounted on the reactor body by a support frame; the lower three-phase separator and the upper inclined plate separator are made of PP plate material.

The high-concentration organic wastewater treatment reactor of the present invention has the beneficial effects as follows:

1) The present invention adopts a two-tier water distribution system. The lower water distribution system swirls and distributes water at the bottom of the reactor through the lower water distribution pipe and the water distribution hood, so as to form an ascending expanded sludge bed. The upper water distribution system further increases the agitation of the sludge bed, so that the sludge and wastewater are fully mixed, achieving a good mass transfer effect. A high-load reaction zone is formed in this area, and most of the pollutants are removed in this area.

2) In the present invention, the wastewater treated in the high-load reaction zone and the low-load zone ascends to the gas-liquid separator located at the top of the reactor through the action of gas stripping of the biogas, and then returns to the bottom of the reactor under the action of gravity to mix with the influent water. Thus, the internal circulation is realized without external power, and the influent water is diluted, so that the reactor has a strong adaptability to sudden changes in influent load, a strong anti-toxicity, and thus provides a guarantee for the stable operation of the reactor.

Under the synergistic effect of the systems of the present invention, high-concentration organic wastewater in different industries can be efficiently treated. The reactor of the present invention has the characteristics of low energy consumption, high removal efficiency, good effluent water quality, large biogas production, and no odor.

