Medical wastewater treatment device buried underground

Medical wastewater treatment device buried underground

Medical wastewater treatment device buried underground——Principle of Underground Sewage Treatment Equipment

atADue to the high concentration of organic matter in sewage, microorganisms are in a state of hypoxia. At this time, microorganisms are facultative microorganisms that convert and decompose organic nitrogen in sewage intoNH3-NAt the same time, using organic carbon sources as electron donorsNO2-NTheNO3-Nconvert toN2And it also utilizes some organic carbon sources andNH3-NSynthesize new cellular substances. soAThe graded pool not only has a certain surface removal function, but also reduces the organic load of the subsequent aerobic pool. Beneficial for nitrification and relying on the high concentration of organic matter present in the raw water to complete denitrification, ultimately eliminating nitrogen eutrophication pollution.
atODue to the significant reduction in organic matter concentration, there is still a certain amount of organic matter and high levels in the sewage treatment equipmentNH3-NExistence. In order to further oxidize and decompose organic matter, and to ensure the smooth progress of nitrification after carbonization is completed. atOSet up aerobic biological contact oxidation tanks with low organic load. atOThere are mainly aerobic microorganisms and self oxidizing bacteria in the graded pool.Aerobic microorganisms decompose organic matter intoCO2andH2O;Self oxidizing bacteria utilize inorganic carbon produced by the decomposition of organic matter or in the airCO2As a source of nutrients, extract nutrients from wastewaterNO2-NTheNO3——NOThe outflow of the graded pool flows intoALevel pool. forAThe graded pool provides electron acceptors and ultimately eliminates nitrogen pollution through denitrification.

Medical wastewater treatment device buried underground——Overall structure of the equipment

Composed of integrated and diversified fiberglass prefabricated components. The device is equipped with a dual function aerator with underwater aeration and water flow propulsion. When treating sewage, the sewage flows into the aeration zone from the top of the device, and the aerator aerates and stirs the sewage underwater. The incoming sewage quickly mixes with the original mixture, adapting to changes in the incoming water quality to the greatest extent possible. The aerator has dual functions of water flow propulsion and underwater aeration, allowing the sewage in the aeration zone to circulate regularly and rapidly increase the dissolved oxygen content in the sewage. Due to the continuous circulation of sewage in the aeration zone, the water quality at each point in the zone is relatively uniform, and the number and properties of microorganisms are basically the same. Therefore, the working conditions of each part of the aeration zone are almost the same. This controls the entire biochemical reaction under good and uniform conditions. Organic matter is gradually degraded by microorganisms, and sewage is purified.

Medical wastewater treatment device buried underground——The advantages are manifested in the following aspects:
Buried underground: The equipment is buried underground, which not only does not occupy space, but also allows for greening and the construction of parking lots on the surface above
Automatic processing: Wastewater can be automatically treated without the need for dedicated personnel for management.
Good environmental friendliness ： The amount of sludge and noise generated is very small, and it does not cause much pollution to the environment.
Easy to operate Its processing technology is relatively novel and simple, with good processing effect and durability.
Diverse arrangements It can be arranged according to standards or flexibly arranged based on actual terrain.

Medical wastewater treatment device buried underground——Types and functions of aeration heads

The function of the aerator in the buried domestic sewage treatment equipment is to transfer the dissolved oxygen from the secondary sedimentation tank of the sewage treatment equipment to the mixed liquid for microbial utilization. The material of the aeration equipment is divided into high-end typespvCarbon steel and stainless steel, with models depending on the size of the sewage equipment,codThe amount of activated sludge used determines its usage, and it can be used in one or multiple series. According to the sewage flow rate and pump head, the types of aeration for activated sludge can be divided into blower aeration equipment, mechanical aeration, and a combination of blower and aeration methods3The frequency of mechanical aeration and blast aeration is high. According to the method, the aeration equipment of buried sewage treatment equipment is divided into mechanical aeration equipment, blast aeration equipment, comprehensive aeration equipment, etc. The aeration equipment is also known as aeration head, aeration tube, aeration wheel, aerator, etc. It is an essential accessory of buried domestic sewage treatment equipment. The power consumption of mechanical aeration is low, and it can be divided into vertical and horizontal types according to the direction of the shaft used. The pump type impeller rotary brush, etc. The motor used in the aerator should be protected against freezing and rain. The blast equipment is divided into Roots blower aeration and centrifugal blower aeration, micro hole explosion, etc.

Medical wastewater treatment device buried underground——Scientific design of manholes

In buried domestic sewage treatment equipment, there is an inconspicuous yet crucial device, which is the manhole, also known as the inspection port. The key point in the design of the manhole for integrated sewage treatment equipment is not to be too small, so as not to make it difficult for slightly overweight people to enter.
Generally, the size of the manhole is controlled by500mm——800mmIt doesn't need to be too large, such as in northern regions where the winter climate is cold and the underground freezing layer is deep1.5When measuring meters, the length of the inspection port should be within1.7About meters, the inspection port can be slightly larger. The key is not to forget to reserve up and down escalators for easy access by future staff during maintenance. When making the cover on the inspection port, attention should also be paid to sealing to prevent odors from leaking out and affecting the environment.

Medical wastewater treatment device buried underground——Oxidation Ditch

Oxidation ditch is a variation of activated sludge process, with a narrow and elongated tank body, hence it is called oxidation ditch. There are various structural types of oxidation ditches, typical of which are:ACarousel style;BObal type;CAlternating working oxidation ditch;DThe integrated aeration sedimentation oxidation ditch technology has been widely used in large and medium-sized urban sewage treatment plants, with a scale ranging from several hundred cubic meters to tens of thousands of cubic meters per day. The process is becoming increasingly sophisticated, and its structural forms are also increasing. Its main features are: simple inlet and outlet water devices; The flow state of sewage can be regarded as a completely mixed type, which is similar to a push flow type due to the narrow and elongated body of the tank;BODLow load, good water quality treatment; Low sludge production rate and low sludge discharge volume; The sludge has a long age and has denitrification function. Design points: Concentration of suspended solids in the mixed solution5000mg/lAverage residence time of biological solids, removalBOD5When, take5~8Tian, when requesting nitrification reaction, take10~30Heaven; The hydraulic retention time is20、24、36The48hAccording to the requirements for the quality of treated water;BOD—SSLoad（Ns）For0.03~0.07kgBOD/（kgMLSS. d）；BODVolumetric load（Nv）For0.1~0.2kgBOD/（m3.d）； The sludge reflux ratio is50~150%The flow velocity of the mixed liquid in the channel is0.4~0.5m/sThe flow velocity at the bottom of the ditch is0.3m/s.

Medical wastewater treatment device buried underground——Precautions

(1)The installation location of the equipment must ensure that there is no water accumulation during rain;
(2)The outlet pipe of the sewage treatment equipment must be located on the opposite floor0.4mfollowing;
(3)No heavy objects or large vehicles are allowed to pass over the equipment(Refers to those without special design)；
(4)Equipment should generally not be emptied of internal sewage to prevent groundwater from causing the equipment to float.