Hospital sewage treatment system problems and improvement measures, Tushan environmental protection
At present, the total number of outpatients and inpatients in major hospitals are on the rise. Due to the expansion of the scale and the density of people, the original sewage treatment system in most hospitals is overwhelmed, and the monitoring indicators of wastewater treatment are often abnormal. According to the requirements of the National Environmental Protection Law, how to ensure the standard discharge is an urgent problem for hospitals.1 hospital sewage water, water quality 1.1 hospital wastewater is often determined by the hospital in water, the scale of hospital and the amount of water and hospital, how much equipment, as the number of hospitalized the functional effect that some hospitals have very close ties, and hospital management system and geographical climate condition also have a certain relationship.According to the actual survey, a hospital wastewater is usually about 80% of the normal water, of course, there are certain deviation, such as in the encounter major accident emergency surgery may be necessary or is some scientific research, wastewater emissions will be increased, but in general are maintained in a stable stage.Sewage discharge per bed is usually maintained at 800L/d in large hospitals, 560L/d in most medium-sized hospitals and 200L/d in small hospitals.And relatively speaking, in all seasons, summer sewage discharge is more, is not comparable to the other seasons, this is mainly due to the factors of summer climate, resulting in the increase of water consumption, finally makes sewage discharge has a significant improvement.At the same time, in the hospital sewage mainly concentrated in two time points, the first is the 7:00-9:00 in the morning, people are in a state of waking, demand for water is larger, and the second is about 6 ~ 8 in the evening, in the period of a dinner is also a stage of people is about to fall asleep, so will cause sewage emissions increase.1.2 Water Quality Hospital sewage water quality often has more germs, bacteria and parasites, which is why the hospital sewage discharge is paid more attention to, once the hospital sewage treatment is not in place, it will cause a variety of diseases, harm to people’s physical and mental health.At the same time, hospital sewage also contains the residue of various drugs, disinfectants or some chemical elements produced in radiotherapy, which will also cause extremely serious damage to the natural environment and affect the implementation and promotion of China’s sustainable development strategy.According to the statistics and investigation of relevant departments, intestinal pathogenic bacteria occupy the most in hospital sewage discharge, accounting for 30% ~ 100%, which is easy to cause related intestinal diseases and harm people’s health.At present, hospital sewage discharge is mainly divided into three types according to the quality of sewage. The first type is infectious bacteria sewage, which refers to sewage with certain infectious properties, which will lead to some related diseases after people contact with it.The second kind is the general disease-carrying bacteria. Although the harm to people is the same compared with infectious bacteria, the disease caused by this type of bacteria can often be cured quickly because of the different nature of bacteria, and will not cause serious harm to people’s health.The third kind is ordinary domestic sewage, which is the least harmful one in hospital sewage discharge, but this kind of sewage will also damage the natural environment to a certain extent.2.1 After initial settling, about 50% of the sink, oil and fine floaters and 20% of the BOD can be removed. Meanwhile, it has a strong buffer effect on the impact change of inlet water quality.The addition of primary sedimentation tank is the most economical and efficient purification step in terms of removing BOD or solids per unit mass.2.2 The sewage from the hydrolytic regulating tank flows into the hydrolytic regulating tank from the primary sedimentation tank. On the one hand, the water quality and quantity are well regulated and homogenized here.On the other hand, a large number of hydrolytic bacteria are stored in the tank to pretreat the aerobic organisms in sewage, which can further remove the suspended matter in sewage.Subsequently, part of the aerobic sludge was sent back to the unit for stabilization treatment, which greatly reduced the amount of sludge in the whole system.There are a lot of washing wastewater in hospital sewage, which contains a lot of surfactant (LAS). This unit also has a good decomposition effect on it, so as to prevent the subsequent aerobic unit from producing a lot of foam and affecting the operation.2.3 Biological contact oxidation pool Due to high ammonia nitrogen in hospital sewage, direct discharge will cause eutrophication of water body, therefore, in the process of treatment process, organic pollution, removal of suspended impurities, and the possibility of removing ammonia nitrogen should be considered.The effluent from the hydrolytic regulating tank is pumped into the biological contact oxidation tank, and the biochemical device with high efficiency combined packing and microporous panel hanging in the tank has a high concentration of biological solids and organic load, so that it has a strong regulation function, which can effectively eliminate the adverse effects of seasonal changes on the stable operation of the biochemical unit.The wastewater can be purified by full aeration, effectively reducing COD and BOD. At the same time, the microorganism in sludge activity can play a certain nitrification effect on ammonia nitrogen in water, which can ensure that the effluent ammonia nitrogen is maintained at a low concentration, and there is no sludge bulking problem, stable and reliable operation, and simple management.2.4 Chlorine dioxide disinfection The second method is chlorine dioxide disinfection.Chlorine dioxide as a kind of through international certification has an antiseptic disinfection effect, high strength in the management of hospital sewage must also have a very significant role, is the best substitute for the traditional series of chlorine disinfectants and upgraded version, chlorine antivirus effect can be more than 5 times, it may be said is a very amazing data,And after the completion of disinfection will not leave a large amount of chlorine to people’s health harm, effectively avoid the emergence of excessive chlorine phenomenon.At the same time, chlorine dioxide biggest advantage is able to in the process of sterilization produced by chemical reaction will not appear relatively some extremely harmful substances, won’t produce trihalomethanes the high carcinogenic substance, and also to the emergence of these substances to a certain degree of inhibition, can effectively guarantee the staff’s health, in the sewage treatmentTo minimize possible hazards.Although the chlorine dioxide has a more significant positive role, but there are also some problems, mainly because of the stability of chlorine dioxide is bad, in the process of using need through the preparation to effective application, a greatly limits the scope of the application of chlorine dioxide, and chlorine dioxide generator in the use of electrical method for the application, also can appear the phenomenon of low efficiency,It is also extremely corrosive to equipment, so the use of chlorine dioxide has not been an effective popularization.2.5 The effluent from the biological contact oxidation tank of the secondary sedimentation tank spills into the secondary sedimentation tank for solid-liquid separation, and the precipitated sludge is pumped back into the hydrolysis regulating tank, and the remaining sludge is regularly pumped into the sludge concentration tank, which is formed into mud by the sludge filter pressure device, sterilized, and then handed over to the qualified department for unified safe and proper treatment.2.6 Contact disinfection Tank The effluent from the second sedimentation tank flows into the folding contact disinfection tank, and a pipe mixer is installed on the inlet pipe to make the sewage and chlorine dioxide disinfectant fully contact and react, and use its strong oxidation ability to kill bacteria and pathogens in the sewage.3 conclusion sewage treatment technology as a very important technology, can effectively promote the sustainable development of our country the implementation of a strategic decision and implementation of an effective protection to the natural environment, especially the construction of hospital sewage treatment system and perfect, can effectively reduce problems caused by improper hospital sewage,Therefore, hospital leaders should pay high attention to hospital sewage discharge, constantly optimize the hospital sewage discharge technology, choose the most appropriate and suitable discharge scheme, and play a certain help for the social development of Our country.To sum up, this paper analyzes and explores the quality and quantity of hospital sewage through Tushan Environmental Protection, and researches the scheme of hospital sewage treatment to provide reference and reference for the majority of relevant workers, hoping to play a certain help.