This project is a hospital sewage treatment station project. The sewage from this project mainly comes from hospital office water, patient domestic water, canteen meal drinking water and medical staff apartment living water. The main pollutants are various organic substances, suspended solids, ammonia nitrogen, detergents, bacteria, viruses, and other pollution. Object. Direct discharge without treatment will seriously pollute the water body, endanger aquatic organisms and affect the health of the population.

To this end, the hospital decided to build a sewage treatment station with a treatment capacity of 40m3/d. Entrusted by the owner, the company based on the relevant environmental protection policies and regulations and the sewage treatment requirements of the hospital, based on the principle of service environment and convenient hospitals, comprehensive comparison Various treatment processes for medical sewage, and comprehensive consideration of factors such as treatment effect, operation management, and economy, complete the design plan for reference or implementation by the hospital.

Hospital sewage nature

The raw water is hospital sewage, which is biodegradable. Treatment of water The total discharge of raw water is 40m3/d, and the water volume per hour of equipment is 2m3.

Influent and effluent water quality

Since the owner has not provided detailed water quality report, this plan is designed according to the regular hospital sewage water quality. The specific indicators are as follows:

Process Description

After the sewage is collected by the septic tank, the uniformity of the sewage is averaged. The liquid level adjusting device is set in the septic tank to adjust the opening and closing of the water pump. After the sewage is lifted by the water pump, it enters the grid of the sewage treatment station and is removed by the grid. After the particulate impurities enter the hospital sewage integrated treatment device, the device is composed of units such as phosphorus removal, nitrogen reduction and COD removal.

The hospital sewage integrated treatment device is mainly composed of a biological biofilm module and activated sludge. A large amount of microorganisms (activated sludge) are sufficiently contacted with a substrate (degradable organic matter in waste water, etc.) in the bioreactor, and metabolism is carried out by oxidative decomposition to maintain self growth and reproduction while degrading organic pollutants. The bio-biofilm module treats the wastewater and sludge mixture by mechanical sieving, retention, and the like. The organic combination of the biological treatment system and the bio-biofilm separation module not only improves the effluent quality and stability of the system, but also prolongs the hydraulic retention time of the refractory macromolecular substance in the bioreactor and strengthens the system for refractory degradation. Material removal effect. The effluent is disinfected and disinfected to kill residual bacteria in the sewage and enter the middle pool.

The excess sludge in the hospital sewage integrated treatment device is lifted from the sludge pump to the sludge tank for sludge digestion, and the remaining sludge is periodically suctioned and cleaned, and the supernatant of the sludge tank is returned to the septic tank for further treatment.

Selection of aerators for treating hospital sewage

How to select Fine Bubble Aeration Systems in hospital sewage treatment

First, the basic structure:

1. Gland, support base and wedge fasteners are injection molded by ABS.

2. The elastic atomizing diffuser is made of EPDM rubber. The check valve and O-ring are made of high-quality rubber. The air duct is made of 90mm UPVC pipe. If thicker gasket is used, it can be installed on the outer diameter of 89mm. It is mounted with wedge fasteners without the need for bonding or welding.

Second, the main technical parameters:

Fine bubble diffuse size: 260mm, 215mm

Service area: 0.35-0.75m2/piece, 0.25-0.55m2/piece

Aeration diaphragm running average pore: 80-100 microns

Air flow: 1.5-3m3/h

Total oxygen transfer coefficient: kla (20 ° C) 0.204-0.337 min-1

Oxygen utilization rate: (water depth 3.2m) 18.4-27.7%

Oxygenation capacity: 0.112-0.185KgO2/m3h

Oxygenation efficiency: 4.46-5.19KgO2/kwh

Aeration resistance: 180-280mmH2O

The air tube design should consider the pressure balance. It is best to form a ring network. Each group of intake pipes should be equipped with a valve to adjust the air volume. Air tube design flow rate: 10-15 m / s for the main pipe and 5 m / s for the branch pipe.

More inquiries can be contacted from KHN water treatment equipments Co., Ltd.

Email: sales@khnwatertreatment.com