1、 Picture

2、 Working principle

The bottom of the filter is equipped with inlet and outlet pipes, and the middle and upper parts are filled layers with a thickness of generally 2.5-3m. A baffle is installed at the top of the fill to prevent the loss of suspended fill. A water outlet filter head is evenly installed on the baffle. The upper space of the baffle is used as a storage area for backwash water, and its height is determined by the backwash water head. There is a reflux pump in this area to pump the filter outlet to the distribution gallery, and then reflux to the bottom of the filter to achieve denitrification. The space between the bottom of the packing layer and the bottom of the filter tank is reserved for the expansion of the packing during backwash regeneration.

3、 Scope of adaptation

The activated sludge process+biological aerated filter treatment technology can be widely applied to the treatment of various industrial sewage, municipal domestic sewage and environmental sewage in Rivers and Lakes, especially for the high concentration organic sewage and high ammonia nitrogen sewage that cannot be treated by traditional methods, which has a unique treatment effect, filling the blank of biochemical treatment of high concentration organic sewage and high ammonia nitrogen sewage at home and abroad. At present, it has been successfully applied in various types of wastewater treatment, such as petroleum, petrochemical, chemical, leather, coking (coal gasification), food, brewing, daily chemical, printing and dyeing, papermaking, and urban domestic sewage.

4、 Process advantages

1. The use of parallel upward flow of gas and water ensures excellent uniformity of gas and water, preventing the condensation and blockage of bubbles in the filter layer, resulting in high oxygen utilization and low energy consumption;

2. In contrast to downward flow filtration, upward flow filtration continuously provides positive pressure conditions throughout the height of the filter, which can better avoid the formation of channel flow or short flow, thereby avoiding the formation of air traps that affect the filtration process through the formation of channel flow;

3. The upward flow creates a favorable semi boost condition for the process, ensuring the persistent stability and effectiveness of the BAF process even with high filtration rates and loads;

4. By using parallel upward flow of air and water, spatial filtration can be better utilized. Air can bring solid substances into the deep part of the filter bed, resulting in high load and uniform solid substances in the filter tank. This prolongs the backwash cycle, reduces cleaning time, and minimizes the amount of water and air used during cleaning.

5. The cutting effect of the filter layer on bubbles prolongs the residence time of bubbles in the filter and improves the utilization rate of oxygen.

6. Due to the excellent interception capacity of the filter, there is no need to install a secondary sedimentation tank behind the BAF.

5、 Introduction to Activated Sludge+Aerated Biological Filter Wastewater Treatment Technology

The combination of activated sludge process and aerated biofilter treatment technology is the current development direction of sewage treatment technology. By using certain technical means to allow fixed microorganisms to adhere to the carrier, the microorganisms can grow firmly. At the same time, adding activated sludge is beneficial for increasing the number of microorganisms, improving the system's processing capacity and adaptability, shortening processing time, and reducing processing costs. Compared with traditional sewage treatment technologies, the activated sludge process+aerated biological filter treatment technology has a series of advantages such as high treatment efficiency, stable operation, maintaining dominant bacterial communities, large biomass in the reactor, low sludge production, and good solid-liquid separation effect. It is an efficient, low consumption, and easy to operate and manage sewage treatment technology.

The activated sludge process+aerated biological filter treatment technology is a new type of sewage treatment technology that addresses the shortcomings of traditional sewage treatment technologies. Based on the summary of domestic and foreign research results, it uses biotechnology methods and high-tech, multidisciplinary combinations such as efficient microorganisms, biological enzyme preparations, and biological carriers to successfully research.

Compared with traditional sewage treatment technologies, the activated sludge process+aerated biofilter treatment technology has the following advantages:

1. The volcanic rock biological filter used in this technology has a higher treatment efficiency than ordinary activated sludge process, with a typical hydraulic load of 100-200 m3/m2 and an organic load of 2000-5000 g/m3, thus reducing the footprint; The aeration intensity is lower than that of ordinary activated sludge method, and there is no need for sludge reflux, which can reduce power consumption and simplify management; The small amount of sludge reduces the workload of post-treatment such as sludge dewatering; The generated sludge has good settling properties, which is beneficial for the removal of suspended solids in the later stage; Strong adaptability, able to adapt to a wide range of different water qualities, with strong tolerance for sudden changes in water quality and quantity, and maintaining stable treatment effects.

2. The microorganisms used in this technology are specialized and efficient microorganisms, which are modified, strengthened, domesticated and cultivated through bioengineering methods on natural microorganisms. They are highly active, adaptable, and have a fast degradation rate and strong resistance to toxins that are difficult for natural microorganisms in sewage. Efficient microorganisms can be firmly combined with carriers, and after one-time domestication, they can be used for a long time, greatly reducing the amount of microorganisms used and lowering operating costs.

3. This technology has wide adaptability, strong processing capability, fast processing speed, and good results. It can be applied to wastewater treatment of different water qualities, especially for high concentration organic wastewater and high ammonia nitrogen wastewater, with unique effects. Directly carry out biochemical treatment on high ammonia nitrogen waste with ammonia nitrogen below 2000mg/L. It has strong tolerance to toxic and harmful substances in sewage, strong adaptability to the impact of water volume and pollutant concentration, and good removal effect on high concentration, large molecule, difficult to degrade organic matter and NH4+- N.

4. This technology has a small amount of sludge, which can reduce the odor of sewage treatment plants, avoid secondary pollution caused by odors to the environment, and improve the environment of sewage treatment plants.

6、 Process characteristics

Compared with traditional sewage treatment processes, the characteristic of the activated sludge process+aerated biological filter treatment process is that the biological tank is filled with microbial carriers or aerators, which can promote the growth of microorganisms. The carrier has a large wet circumference, a small hydraulic radius, good laminar flow state, particle settling is not affected by turbulent flow interference, and the effluent quality is good. Microorganisms are highly efficient and specialized microbial preparations that modify and enhance natural microorganisms through certain technological means. They have high activity, strong adaptability, and can degrade difficult substances in sewage at a fast and high rate, resulting in good treatment effects.

Compared with other biological treatment processes, the activated sludge process+aerated biofilter process has the following advantages:

1. The carrier has a large specific surface area, high porosity, low ventilation resistance, high heat dissipation capacity, and good heat resistance.

2. Efficient microorganisms have high activity, wide adaptability, and strong toxicity resistance. They have good removal effects on high concentrations, large molecules, difficult to degrade organic matter, and NH4+- N. Their degradation ability and rate are more than 10 times that of traditional sewage treatment processes.

3. Microorganisms are distributed in groups according to the grading of the biochemical pool, and each pool can form a dominant microbial community. The amount of microorganisms used is small, the degradation ability is strong, and the cost is low. When the system is restarted after stopping, microorganisms do not need to be re cultured, and the system can be quickly restored.

4. It has strong tolerance to toxic and harmful substances in sewage, strong adaptability to the impact of water volume and pollutant concentration, and good removal effect on high concentration, large molecules, difficult to degrade, toxic and harmful organic matter. BOD5 has a high volumetric load and can maintain biodiversity based on carrier performance, allowing aerobic, anaerobic, and facultative bacteria to coexist. It has a unique effect on high concentration organic wastewater and high ammonia nitrogen wastewater. Direct biochemical treatment of high ammonia nitrogen wastewater with ammonia nitrogen below 2000mg/L has good denitrification and phosphorus removal effects.

5. The pool has a small capacity and footprint, which can save space and infrastructure investment.

6. The aeration tank has a small amount of sludge and low odor, which can avoid secondary pollution to the environment and improve the environment of sewage treatment plants.

7. Good impact resistance, strong tolerance to toxic and harmful substances in sewage, strong adaptability to the impact of water volume and pollutant concentration, and can avoid system paralysis due to adverse factors.

7、 Microbial carrier

The microbial carrier used by our company is porous and lightweight volcanic rock biofilter. The average porosity inside and outside the filter material is around 40%, which has low resistance to water. Compared with similar filter materials, it requires less filter material and can still achieve the expected filtration goals; A large specific surface area, high porosity, and inertness are conducive to the contact, membrane formation, and growth of microorganisms, maintaining a large microbial population, and facilitating the mass transfer of oxygen, nutrients, and waste generated during microbial metabolism. Due to the fact that volcanic rock biofilters are non pointed granular and have pore sizes mostly larger than ceramic particles, they have less resistance to water flow during use, saving energy consumption.

8、 Process efficacy

The treatment process of activated sludge and aerated biofilter utilizes the metabolic activity of microorganisms to decompose and transform pollutants in wastewater, achieving the goal of purifying water quality, and the effluent quality meets or exceeds the "Reclaimed Water Reuse Standard".

Practical application has proven that the activated sludge process combined with biological aerated filter treatment technology requires less investment, occupies a small area, has good treatment effects, low operating costs, safe and reliable operation, and produces effluent quality better than the "Reclaimed Water Reuse Standard". It has significant economic and social benefits and is a high-tech sewage treatment technology that benefits the country, the people, and future generations.