Carbon Steel Hospital Sewage Treatment Equipment 50T/D Packaged Stp Plant

Carbon Steel Hospital Sewage Treatment Equipment 50T/D SQYY-50

1, The characteristics of hospital sewage:
Hospital sewage contains some special pollutants, such as drugs, disinfectants, diagnostic agents, detergents, as well as COD, BOD5, ammonia nitrogen, SS, pathogenic microorganisms, parasitic eggs, and various viruses, such as roundworm eggs, hepatitis viruses, tuberculosis, and dysentery bacteria. Compared with industrial wastewater and domestic sewage, it has the characteristics of small water volume and strong pollution power. If left unchecked, it will inevitably pollute water sources, spread diseases, and endanger the health of people in surrounding areas.
2, Feasibility analysis of hospital sewage treatment measures
According to the analogy of similar projects, the main wastewater in this project is hospital domestic wastewater and medical wastewater. The treatment process of biochemical treatment+disinfection treatment can be adopted. The wastewater is discharged after being treated to meet the Class B discharge standard specified in GB18918-2002 "Pollutant Discharge Standards for Urban Wastewater Treatment Plants".

3, Design basis and principles for hospital sewage treatment plan
During the design of the scheme, the following relevant standards shall be implemented:
(1) Emission Standards for Pollutants from Urban Sewage Treatment Plants (GB18918-2002);
(2) Integrated Wastewater Discharge Standard (GB8978-1996);
(3) Code for Design of Outdoor Drainage GB50014-2006;
(4) Code for Structural Design of Water Supply and Drainage Engineering (GBJ69-2002);
(5) Code for Design of Industrial Corrosion Protection GBJ46-82;
(6) Handbook of Industrial Pollutant Generation and Emission Factors;
(7) Urban Regional Environmental Noise Standard GB3096-93;
(8) Code for Design of Power Supply and Distribution Systems (GB50217-94);
(9) Code for Design of Building Water Supply and Drainage GB50015-2003;
(10) Regulations on Selection of Automation Instruments (HG20507-92);
(11) Code for Design of Low Voltage Electrical Installations (GB50054-95);
(12) Design Specification for Pump Stations GB/T50265-97;
(13) Relevant regulations of local environmental protection bureaus;
(14) The environmental noise standard for urban areas is GB3096-93.
Design principles:
Strictly implement national and local environmental, health, and safety regulations, and after treatment, the main water quality indicators meet relevant national standards;
Adhering to a scientific attitude in the design, the water treatment process adopted should not only reflect advanced technology, economic rationality, but also be mature, safe and reliable, and have the characteristics of simple operation and convenient operation and management;
The processing unit is relatively compact and occupies as little land as possible, while ensuring stable operation and meeting the standard of effluent quality, minimizing engineering and operating costs as much as possible;
Adhere to the principle of combining sewage biochemical treatment with ecological treatment in the design, and create a harmonious ecological environment for sewage treatment.

4, Overview of Hospital Sewage Treatment Engineering
According to the data provided by the owner, the designed treatment water volume Q=100m3/d. The equipment operates for 20 hours per day, with an hourly processing water volume of 5.0m³

5, The quality of inlet and outlet water for hospital sewage treatment
According to the information provided by the owner and the water quality of the same type of sewage, the inlet water quality is as follows:

The treated water quality should meet the Class I and Class B standards of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), as shown in the table below:

6, Introduction to Hospital Sewage Treatment Process

The sewage first enters the regulating tank for uniform water quality and quantity, and is lifted to the hydrolysis acidification tank by a lift pump. Anaerobic denitrification is carried out in the hydrolysis acidification tank to reduce ammonia nitrogen in the sewage. The sewage is pushed from the hydrolysis acidification tank to the first and second level biological contact oxidation tanks for aerobic aeration, where microorganisms decompose organic matter to reduce COD. At the same time, the nitrifying bacteria in the sewage digest and treat the sewage, and some of the mixed liquid is returned to the hydrolysis acidification tank for denitrification. The effluent from the contact oxidation tank enters the sedimentation tank for mud water sedimentation separation, and the supernatant is pushed to the contact disinfection tank. The tank is disinfected with chlorine dioxide and discharged up to standard. The sludge is regularly discharged into the sludge tank, and the supernatant returns to the hydrolysis acidification tank. The remaining sludge is regularly transported by a manure truck to the harmless treatment center for harmless treatment.
The A/O process is a sewage biological treatment system composed of anaerobic and aerobic reactions. After passing through the A section, the sewage enters the O section and organic matter is oxidized and decomposed by aerobic microorganisms in the aerobic section. Ammonia nitrogen is converted into nitrate nitrogen through nitrification under aerobic conditions, and then enters the anoxic section through mixed liquid reflux. Under carbon source conditions, pre denitrification is carried out to convert nitrate nitrogen into molecular nitrogen and escape into the air, effectively removing ammonia nitrogen. The A/O process also has good phosphorus removal function. After entering tank A, the sewage is mixed with the returned sludge. The phosphorus accumulating bacteria in activated sludge absorb a large amount of BOD in wastewater during this process, and release the phosphorus in the sludge into the mixed liquid in the form of orthophosphate. After the mixed liquid enters the aerobic tank, the organic matter is oxidized and decomposed, while the phosphorus accumulating bacteria absorb a large amount of orthophosphate from the mixed liquid into the sludge. Due to the fact that phosphorus accumulating bacteria absorb more phosphorus under aerobic conditions than they release under anaerobic conditions, the wastewater undergoes an alternating process of "anaerobic aerobic" and sludge separation in a secondary sedimentation tank to achieve phosphorus removal.
After the implementation of hospital sewage treatment equipment, it brings good social and environmental benefits, which can effectively reduce the discharge of pollutants in this project and the surrounding environment; It is beneficial for improving environmental quality, ensuring people's physical and mental health, and has significant social benefits for improving people's living standards and living environment.