Currently hospital sewage disinfectant is generally used chlorine dioxide disinfectant. Specific forms of electrolysis, chemical method, finished chlorine dioxide disinfectant.
Electrolytic chlorine dioxide: that is, electrolysis of salt to generate chlorine dioxide, because the cost of salt is low, so the method is initially cost-effective, but there are the following problems:
1) electrolysis equipment late maintenance costs are high. Electrode discharge will cause the burst tank: electrolysis tank positive and negative electrodes are generally inserted into the salt water from above, in the electrolysis process, electrolysis of hydrogen and water vapor will contain salt together with the salt from the salt water volatilization, resulting in the liquid surface of the electrode salt, electrode spacing is very small, the salt will cause the electrode short-circuit, sparks, resulting in the explosion of gas burst tanks, many of the electrolysis method of sodium hypochlorite equipment have occurred in this accident. The cost of replacing the electrode gang is almost 5000-6000 yuan.
2) Electrolysis is mainly generated by sodium hypochlorite and chlorine gas, the generation of chlorine dioxide is very small, and easy to generate a variety of carcinogenic compounds such as trihalomethanes.
3) High cost of electricity. Current efficiency is low, the salt used is not possible as electrolytic operation of electrochemical plants, the first salt purification, remove calcium, magnesium, sulfate and other impurity ions, these impurity ions in the electrode between the repeated discharges, consuming electricity, resulting in electrolysis process current efficiency is very low, the cost of electricity is large.
Chemical chlorine dioxide: that is, sodium chlorate and hydrochloric acid reaction to generate chlorine dioxide, this method is also more cost-effective upfront, but has the following shortcomings:
1) the need for approval before procurement. Sodium chlorate and hydrochloric acid as a hazardous chemical, before use, you need to go to the government public security department for the record approval, the process is complex.
2) Inconvenient procurement and transportation. Sodium chlorate and hydrochloric acid are hazardous chemicals, strictly controlled by government departments, and are not easy to purchase or transport.
3) Inconvenient storage after procurement. Sodium chlorate and hydrochloric acid have to be stored in two warehouses, and if they are not properly managed and explode, it will cause a major safety accident and incalculable loss to the unit.
4) High demand for preparation personnel. Preparation process equipment will produce irritating gases, the preparation of personnel need to strictly follow the preparation process, personnel need to wear high-quality gas masks during the work process.
5) High requirements for preparation equipment. Chemical chlorine dioxide preparation generally use high purity chlorine dioxide generator, if the equipment is not up to standard, in the preparation process mixed with the production of other chemicals, it is very easy to cause equipment explosion.
6) The preparation process is strict. The two reactions require a certain reaction time, and water disinfection process on the water temperature, water PH value, etc. have strict requirements, once a little error, will cause sodium chlorate and hydrochloric acid waste, reaction is not sufficient, more likely to produce trichloromethane and other "three" by-products, will cause secondary pollution of drinking water sources, leaving a huge security risks.
Dioxide is the most common type of acid in the world.
Chlorine dioxide finished preparations: chlorine dioxide is more convenient and cost-effective way to choose.
1) Convenient procurement and storage. There is no need to record before purchasing; in purchasing, it is directly transported through logistics; after purchasing, it only needs to be stored in a warehouse and placed in a cool place.
2) Simple usage. The finished chlorine dioxide preparation can be added directly after the activator is added to the mother liquor, with high activation rate and no harmful by-products.
3) Cost-effective. Funding costs can be basically the same as the chemical method of chlorine dioxide, if the unit used before the chlorine dioxide generator, with chlorine dioxide finished preparation of AB agent can be completely instead of sodium chlorate and hydrochloric acid to produce chlorine dioxide.
4) low power consumption. Because the finished preparation is pure, the power required to generate chlorine dioxide compared to electrolysis and chemical method is 3-5 times lower.