The sewage composition of the hotel is quite miscellaneous, including kitchen sewage, guest room toilet sewage, car washing sewage, sewage discharged from the boiler room, air conditioning cooling water, wastewater recycled and filtered in the swimming pool, etc.
The composition of hotel sewage is also very complex, with low pH value, high SS, high turbidity and high content of organic matter, such as food fiber, starch, fat, animal and vegetable oil, detergent and so on.
The biological contact method is mainly to fill the tank with filler. When the oxygenated sewage flows through the biofilm on the filler at a certain flow rate, it will be absorbed and utilized by the microorganisms on the biofilm, so as to remove the pollutants in the sewage and purify the sewage.
Coalescence filtration method mainly adopts lipophilic and hydrophobic materials. When oily wastewater passes through the material, tiny oil beads agglomerate on its surface to form an oil film. When it reaches a certain thickness, under the action of buoyancy and water shear, it separates from the surface of the filter material to form large oil beads floating to the water surface, so as to separate oil and water.
Electrochemical method: when the electrolyte solution is subjected to electrochemical reaction under the action of current, the toxic substances in the solution will undergo redox reaction at the anode and cathode, which will be reduced to low molecular organic matter or directly oxidized to CO2 and H2O.