What are the requirements regarding the frequency of monitoring wastewater, noise, exhaust gases, etc., in chemical enterprises?

I’m very curious about this question as well; I’ve looked up a lot of information but haven’t found a definitive answer. However, I’ll share what I’ve found here and await answers from those who are more knowledgeable. In many places, it is generally stated that depending on the nature of the enterprise and its level of pollution emissions, the frequency of monitoring also varies. For key enterprises, we conduct monitoring once a quarter, while for ordinary enterprises it seems to be twice a year. In many places, it is also stated that the monitoring scope and frequency should be determined in accordance with the relevant monitoring technical specifications. When searching for \"environmental monitoring technical specifications\" on Baidu, the most common results are those related to radiation and marine environmental monitoring; it seems that no specifications related to enterprise environmental technologies can be found. Regarding the second question from the original poster, you can refer to the following. **Order No. 39 of the General Administration for Environmental Protection: Regulations on Environmental Monitoring Management. Article 21: Polluters must carry out self-monitoring of their pollution discharge in accordance with the requirements of environmental protection departments at or above the county level and the **technical specifications for environmental monitoring. 　　 　　If the polluter complies with the **environmental monitoring technical specifications**, and if the environmental monitoring agencies affiliated with the environmental protection departments at or above the county level verify that it meets the required capacity standards and technical conditions, then its monitoring data shall be used as a basis for determining the types and quantities of pollutants emitted. 　　 　　Polluters that do not possess the capability for environmental monitoring should entrust environmental monitoring tasks to agencies affiliated with environmental protection departments, or to environmental monitoring agencies recognized by provincial environmental protection departments ； The costs associated with the monitoring activities carried out by the environmental monitoring agency commissioned to do so are borne by the client, and the charging standards are in accordance with **relevant regulations. 　　 　　An environmental monitoring agency recognized by the provincial environmental protection department refers to an institution that is not affiliated with the environmental protection department and is engaged in environmental monitoring activities. Such an institution may voluntarily apply to the local provincial environmental protection department for certification of its competence in carrying out environmental monitoring tasks; those that pass the assessment are considered to be environmental monitoring agencies recognized by the provincial environmental protection department. 　　 　　Environmental monitoring agencies recognized by the provincial environmental protection authorities shall be subject to supervision and inspection by the environmental monitoring agencies under the local environmental protection authorities. I read such a sentence in a book. According to China’s Metrology Law, any organization that provides certified data to society must undergo \"metrological certification\" audits; only data that meets the requirements of this certification and bears the CMA mark have legal validity.

Key national-controlled pollution sources, key provincial-controlled pollution sources, and centralized pollution treatment facilities: Starting from the first quarter of 2007, wastewater pollution sources were to be monitored at least once per quarter； Exhaust pollution sources must be monitored at least once every six months ； Central heating systems used for heating are monitored only once during the heating season. Source: Technical Regulations for the Monitoring of Industrial Pollution Sources and Centralized Pollution Treatment Facilities. Personal opinion: This approach still cannot solve many problems. In my view, two conditions need to be met: one is to satisfy the needs of environmental protection management, as environmental monitoring serves as the eyes of environmental protection management ； One is to meet the requirements of **relevant regulations, although this aspect doesn’t seem very clear ； The work plan for supervised monitoring of key industrial pollution sources across the country states that wastewater pollution sources are to be monitored once per quarter starting from the third quarter of 2006, while air pollution sources are to be monitored semi-annually. Last edited by zfc318 on 2009-4-20 at 17:36.]

1. A few days ago, the instructor who teaches ISO14001 came by and discussed the issue of monitoring wastewater and exhaust gases under ISO14001: there must be at least one third-party inspection per year, and such third parties must have \"metrological certification\". 2. At present, in addition to our own tests, the Environmental Protection Agency comes to take samples for testing once per quarter. 3. Online monitoring devices: For wastewater – COD: once every 4 hours; pH: continuously; flow rate: continuously. For exhaust gas – SO2: continuously

The views of friend zfc318 from the 3rd floor, based on the answers provided in the Technical Regulations for Monitoring Industrial Pollution Sources and Centralized Pollution Treatment Facilities, have provided us with new insights. However, it is precisely this point that I think is still debatable. Firstly, the regulations on monitoring techniques for industrial pollution sources and centralized pollution control facilities were formulated in accordance with the requirements of the \"First National Pollution Source Census Plan,\" following a census methodology that combines monitoring with material balance calculations as well as technical approaches with census techniques. These regulations were established to ensure the scientific validity and feasibility of the pollution source census. ”Why isn’t he acting in accordance with the Environmental Protection Law of the People’s Republic of China? Secondly, it is one of the technical regulations for the first national census of pollution sources; it was established to ensure the scientific validity and feasibility of such a census, and it is not a standard for the day-to-day implementation of environmental protection. So I understand the view expressed by the friend in room 3, zfc318, namely that \"for nationally monitored key pollution sources, provincially monitored key pollution sources, and centralized pollution treatment facilities: starting from the first quarter of 2007, wastewater pollution sources must be monitored at least once per quarter.\" ； Exhaust pollution sources must be monitored at least once every six months ； Central heating systems used for heating are monitored only once during the heating season. ”This applies only to the first national pollution source census; it is not necessary to follow this approach for all routine environmental monitoring tasks. What are the required monitoring frequencies for wastewater, noise, exhaust gases, etc., in chemical manufacturing enterprises, as I have proposed? Is it once a year or twice a year? Are there any specific regulatory requirements regarding whether monitoring should be carried out by oneself or through an external service? ” Questions such as these still lack clear answers. Nevertheless, thanks to all my friends for their active participation.

Replying to the person above: Thank you for paying attention to my post. There is a sentence in my post that says, “Although this thing doesn’t seem very clear.”； ”What I want to say is what you said upstairs; great minds think alike. Secondly, it seems that there were different requirements in various periods; for example, a certain company was designated as a key entity for emission reduction during the 11th Five-Year Plan period. As a company under national supervision and close monitoring, its original monitoring frequency (**), which was once every six months, was changed to once per quarter ； Actually, I’ve also been trying to figure out what you posted – the frequency of environmental monitoring should meet two functions ； One is designed to serve the company’s environmental management staff; as long as it meets the management needs, the lower the frequency, the better ； 2 is for compliance with laws and regulations; if there are no clear provisions in this regard, it is recommended to consult the local environmental protection authorities for their advice! ! ! Discussion is welcome

It’s because I consulted the local environmental protection authorities and still didn’t get clear answers, that’s why I’m asking on this forum. I believe there are experts who understand this.

China’s \"Technical Specifications for Environmental Monitoring\" stipulate that for wastewater discharge sources that submit data directly to **, industrial wastewater should be sampled and monitored 2–4 times per year； Domestic wastewater is sampled and monitored twice a year, once in spring and once in summer ； Hospital wastewater is sampled and monitored 4 times per year, once per quarter. Reference: Comprehensive Book on Environmental Monitoring