MBBR Process: Suspension Filling Integrated Wastewater Treatment Technology

The MBBR process, first developed in Norway about 25 years ago, is now a mature and proven compact wastewater treatment technology. Like the activated sludge process, the MBBR process takes full advantage of the entire reaction cell for biomass growth. This article focuses on MBBR suspended filler integrated reactor sewage treatment technology, see below:

1, the process of introduction

2, technical principles

MBBR process principle is by adding a certain amount of suspended carrier to the reactor to improve the reactor biomass and biological species, thereby enhancing the efficiency of the reactor. As the packing density close to water, so when aeration, and water was completely mixed state, microbial growth environment for gas, liquid, solid three-phase. Carrier in water collision and shearing, the air bubbles are more small, increasing the utilization of oxygen. In addition, each carrier has different biological species inside and outside, some internal growth of anaerobic bacteria and orophane bacteria, external good bacteria, so that each carrier is a microreactor, nitrification and denitrification reaction exist , Thus improving the processing effect. MBBR process combines the advantages of both traditional fluidized bed and biological contact oxidation process is a new and efficient sewage treatment method, rely on the aeration tank aeration and water flow to enhance the role of the carrier in the fluidized state, and thus the formation of suspended Growth of activated sludge and attached to the growth of the biofilm, which makes moving bed biofilm using the entire reactor space, give full play to the superiority of both the adherent phase and suspended phase organisms, so that Yang Yang avoidance, complement each other. Unlike previous packings, suspended packings frequently come into contact with sewage and are therefore referred to as "moving biofilms."

Suspended bio-filler mainly attached to heterotrophic bacteria and nitrifying bacteria, through the nitrification to remove ammonia nitrogen in the original sewage, while COD also have a good removal effect. According to influent water quality and effluent standards, can also be designed into ① A / O membrane reactor ② A / O nitrification and denitrification reactor + MBR.

3, the key technology

Microbial hanging membrane culture, a reasonable control of dissolved oxygen and HRT, packing filling rate.

4, technical advantages

Compared with the activated sludge method and the fixed-packing biofilm method, the MBBR has the advantages of high efficiency and operational flexibility of the activated sludge method, as well as the traditional biofilm method having the characteristics of impact resistance, long sludge age and few remaining sludge.

(1) packing characteristics

Filler mostly polyethylene, polypropylene and its modified materials, made of polyurethane foam, the proportion of close to water, mainly cylindrical and spherical, easy to hang the film, not the group, not blocked, easy stripping.

(2) good denitrification ability

Fillers formed good support, hypoxia and anaerobic environment, nitrification and denitrification can occur in a reactor, the removal of ammonia has a good effect.

(3) removal of organic matter good effect

The reactor sludge concentration is higher, the general sludge concentration of 5 to 10 times the normal activated sludge method, up to 30 ~ 40g / L. Improve the efficiency of the treatment of organic matter, while strong impact load capacity.

(4) easy to maintain and manage

There is no need to set a packing bracket in the aeration tank, which facilitates the maintenance of the aerator on the packing and the bottom of the aeration tank, meanwhile, saves investment and floor space.

5, MBBR technology proposal

(1) research and development of suspended fillers

The chemical properties of the surface of the filler and the mechanism of the exfoliation of the filler should be studied in order to increase the specific surface area of the filler. The cost of the filler should be reduced as much as possible so that the filler can be widely applied to the wastewater treatment. Activated carbon, starch, gelatin, etc. can be used as bioactive additives, so that suspended fillers can promote the growth and reproduction of microorganisms.

(2) MBBR combination with other processes

Multi-level MBBR, MBBR and A / O combined process have their own advantages, the combination of these processes should be strengthened research and practical application. (3) MBBR process reactor research

By studying the reactor fluid mechanics, the shape of the reactor can be determined to optimize the reactor structure, thus avoiding packing and reducing energy consumption. The preliminary research on the structure type and control scheme of multistage continuous suspended packed moving bed reactor can lay a foundation for popularization and application of project technology.