The HDWW underground integrated ultra micro power sewage treatment device is an efficient sewage treatment device developed by our company by drawing on the advanced Moving Bed Biofilm Reactor (MBBR) process from Japan, Europe and America, and combining our years of sewage treatment technology experience. The MBBR sewage treatment process is a new type of biofilm process developed to address the complex operations of fixed bed reactors requiring regular backwashing, biofluidized bed reactors requiring sufficient power to fluidized the carrier without loss, and aerated biofilters requiring cleaning of filter media and replacement of aerators due to clogging.

MBBR mainly consists of three parts: reactor body, suspended biological carrier, and bottom microbubble aerator. Suspended biological carriers have a large specific surface area, and biofilms grow extensively on the inner and outer surfaces of the suspended carrier. The carrier after membrane hanging has a density close to that of water, and is always suspended in the sewage and can move freely. Under the aeration and stirring action of the bottom microbubble aerator, suspended carriers collide with each other in the reactor and rotate or flip, improving the transport of liquid-phase organic matter and promoting the renewal of biofilm. The organic matter and suspended solids in sewage are intercepted and adsorbed by biofilms, and used as nutrient solutions for microbial growth. They are digested during the process of microbial reproduction, and the sewage is degraded. At the same time, there are about 8% -12% suspended activated sludge in the sewage, which also has a purifying effect on the sewage. So the aerobic moving bed biofilm reactor is an efficient biological wastewater treatment device that combines suspended growth activated sludge method and attached growth biofilm method. MBBR has high treatment efficiency, low energy consumption, stable effluent quality, strong shock load resistance, compact structure, small volume, no need for sludge reflux, no blockage, no need for backwashing, and simple maintenance and management. The designed residence time is 4-6 hours, which is more effective in treating sewage than similar products. It has significant effects on denitrification, phosphorus removal, and degradation of organic pollutants. The main indicators of the effluent meet the first level B standard of the national "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002). If further treated, it can be reused as landscape water, toilet flushing water, and landscaping water, achieving excellent economic and social benefits.

2、 Applicable locations:

MBBR is suitable for the treatment of small and medium-sized (below 3000T/d) domestic sewage and industrial organic wastewater. The device is designed as an underground integrated structure, integrating with the surrounding natural landscape and achieving programmed automatic control, with excellent prospects for promotion and application. It can be widely used in urban residential areas, rural living areas, hotels, schools, government agencies, tourist attractions, military barracks, as well as food processing industries such as slaughterhouses, meat products factories, dairy factories, etc.

3、 Model Description:

HDWW buried integrated ultra micro power sewage treatment device: (also known as: buried integrated ultra micro power sewage treatment equipment), divided into HDWW-H aerobic buried integrated ultra micro power sewage treatment device (HDWW-H aerobic moving bed biofilm reactor) according to whether aeration is required in the treatment process

4、 Device features:

1. A true buried lazy integrated equipment: Compared with domestic equipment with the same processing capacity, this equipment occupies the smallest area and can be installed in the lawn of a residential area, integrating with the surrounding natural landscape. The equipment is buried underground, which is beneficial for insulation and can still operate normally in the cold season in the north without disturbing people, noise, or odor.

2. Save construction time and infrastructure costs: Factory production, on-site assembly, no need to pre build complex and expensive cement foundations.

3. High degree of automation: unmanned, automatic operation, fault alarm, convenient for daily management.

4. Easy maintenance: Suspended fillers do not need to be replaced for life, never clog, and do not require backwashing; The motor is located within easy reach of the ground, making it convenient for maintenance or replacement; Almost no maintenance costs.

5. Low operating costs: The rotary cutting microbubble aerator has a large aeration volume and much lower energy consumption than other aeration products. The bubble diameter is small, the dissolved oxygen is high, and the oxygen utilization rate is high, so it can be intermittently aerated with ultra-low power consumption. And the aeration required by the MBBR aerobic device is 1/20 of the traditional activated sludge process, 1/6 of the oxidation ditch, and 1/4 of the SBR, which greatly saves operating costs.

6. High efficiency of pollutant degradation: The system operates continuously, and the effluent meets the first level discharge standard of the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996) or the first level B standard of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" (GB18918-2002); Strong adaptability to changes in organic load of incoming water; There is no need for sludge reflux, and there is no sludge swelling problem that is prone to occur in activated sludge processes.

7. Short debugging cycle: easy to hang film, fast startup: the equipment packing can complete the film hanging process in 2 weeks at a water temperature of about 15 degrees Celsius.

8. Can be stopped and started at any time: It can be stopped when not in use temporarily. At this time, the biofilm on the surface of the packing material does not die, but exists in the form of spores. Once water is supplied and aerated, it can be restored to normal in a short time. This feature makes the device very suitable for sewage treatment in areas with large changes in water volume. In tourist attractions, the amount of sewage is greatly affected by changes in seasons and tourist numbers. It can operate continuously or intermittently during the off-season, and can resume normal operation during the peak season, avoiding the drawbacks of other sewage biochemical treatment processes that cannot operate intermittently. It is particularly suitable for use in this industry.

9. Unique mobile suspended packing: MBBR uses mostly polyethylene or polypropylene plastic packing, shaped like small cylinders (with diameters and heights ranging from approximately 10250mm). There is a cross support at the center of the cylinder, and many tail wings extend along different radial directions on the outer side. The carrier density is slightly lower than that of water (0.9220.97 g/cm3), and the specific surface area of the filler is larger (1602500 m2/m3). The surface is easy for biofilm adhesion and growth, and the clever structural design ensures that the filler does not clump or block during use, always having an ideal porosity and good ventilation and water passing performance

5、 Operation process and equipment parameters of HDWW-H aerobic buried integrated sewage treatment device:

（1） Schematic diagram of device process

model	Processing water volume (m3/d)	Equipment outer diameter (meters)	Total height (meters)	Aeration machine power (kw)	Aeration time (hours/day)
HDWW-H10	10	1.85	2.75	1.1	6
HDWW-H25	25	2.4	3.1	1.5	6
HDWW-H40	40	3.1	3.1	1.5	6
HDWW-H60	60	3.1	3.6	2.2	6
HDWW-H80	80	4.2	3.6	2.2	8
HDWW-H100	100	4.2	3.6	2.2	10
HDWW-H150	150	4.2	4.2	2.5	8
HDWW-H200	200	5.2	4.2	2.5	10
HDWW-H300	300	6.0	4.6	3.0	8