Internal circulation bioreactor

Abstract

The invention discloses an internal circulation bioreactor, comprising a feed pipe, a discharge pipe, an air collecting pipe, an impeller, a partition, a flow guiding device, a reactor body, a three-phase separator, and a fender. Under the action of the impeller and the flow guide device in the middle of the circulating bioreactor, the material in the partition is in a downward flow state, and driven by the blades on the impeller and the flow guide device, it enters the partition through the channel at the bottom of the partition External, and mixed with the material outside the partition and in an upward flow state, so that the material can achieve the effect of internal and external circulation mixing on the outside of the partition and downward on the inside of the partition, which improves the mass transfer efficiency and organic load. The residence time of the sludge and the quality of the effluent water are improved, and the scope of application of sewage treatment (such as low SS) is improved. At the same time, the gas-liquid separation of the biogas and the feed liquid is realized under the action of the three-phase separator on the upper part of the reactor body, which increases the transmission efficiency. Quality, improve gas production efficiency.

Description

technical field [0001] The invention relates to the field of microbial anaerobic treatment and biogas generation, in particular to an internal circulation bioreactor, which can be used for anaerobic treatment of organic waste, production and collection of biogas. Background technique [0002] Anaerobic digestion refers to the process in which organic matter is degraded by anaerobic microorganisms and produces biogas under anaerobic conditions. Biogas is a mixed gas containing various gas components, among which the content of methane is 50% to 70%, the content of carbon dioxide is 25% to 40%, and the total volume of other gases is about 2%. Biogas can be burned, and the purified methane can be directly used as natural gas. Anaerobic digestion is widely used in the treatment of industrial and agricultural organic waste because it can efficiently process a variety of complex organic matter and generate energy gas. [0003] Anaerobic reactor is the key device of anaerobic dig...

AI Technical Summary

Problems solved by technology

The development of anaerobic digestion reactors has also gone through different stages. The first generation of anaerobic reactors, including conventional anaerobic reactors (CADT), fully mixed reactors (CSTR), and anaerobic contact digesters (ACP ), the characteristics of the reactor at this stage are that the general structure is relatively simple, the investment is small, and the operation and management are relatively simple. It is suitable for organic wastewater with high concentration or high suspended solids. Poor and other disadvantages

The second generation of anaerobic reactors, including anaerobic filter (AF), upflow anaerobic sludge bed reactor (UASB), anaerobic baffle reactor (ABR), these reactors have high treatment efficiency and durability Strong load capacity, good effluent quality, etc., suitable for organic wastewater with relatively low SS content, but there are also disadvantages such as large investment, high equipment operation and maintenance costs, etc.

The third generation of anaerobic reactors, including expanded granular sludge bed reactor (EGSB), internal circulation anaerobic reactor (IC), upflow sludge bed reactor (UBF), etc., these reactors have high treatment efficiency , strong load resistance, good effluent quality, etc., but the investment in equipment is relatively large, and the requirements for SS content in wastewater are strict

But at the same time, the main disadvantage of this process is that it is impossible to separate the hydraulic retention time and solid retention time. The sludge retention time is equal to the hydraulic retention time, and the sludge with sufficient concentration cannot be accumulated in the reactor. In addition, the scum on the surface is easy to crust, resulting in Poor gas overflow

Since the sludge with sufficient concentration cannot be accumulated, the SS concentration of the material is also limited to a certain extent, which reduces the application range of the process

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