As the double festivals approach, Dongguan focuses on polluting source enterprises. The first on - site inspection and verification of on - line environmental monitoring measuring instruments have achieved results
As the Mid-Autumn Festival and National Day holidays are approaching, Dongguan is centering on the energy conservation, emission reduction and consumption reduction project to promote the transformation of industries towards green and low-carbon development. As the "measurement anchor point" for enterprises' pollutant discharge data, the authenticity of the data from on-line environmental monitoring measuring instruments directly determines the scientific nature of the evaluation of pollution control effects and regulatory decisions. If the instruments are inaccurate, all the governance investments may be "off-target". Against this background, the Dongguan Branch of the Guangdong Institute of Metrology recently launched the first inspection and verification of on-line environmental monitoring measuring instruments of pollution source enterprises, targeting to solve the hidden danger of "data distortion" in four key pollutant discharge industries and build a "measurement defense line" for Dongguan's environmental supervision.
Accurately lock in the core pollution sources and radically eliminate data deviations from the "equipment end"
The core logic of this inspection and verification is to identify the "key few" in Dongguan's pollution emissions. The selection of the four major industries of papermaking, circuit boards, dyeing, and sewage treatment is due to their "weighted status" in Dongguan's industrial pollution
- The paper industry is a major consumer of water and a large emitter of COD (Chemical Oxygen Demand). A single paper mill can discharge thousands of tons of wastewater per day.
- Circuit board enterprises are involved in the emission of heavy metals (copper and nickel). If the monitoring data is inaccurate, it may lead to the "unregulated" situation of heavy metal exceeding the standard.
- The wastewater from the bleaching and dyeing industry has high chroma and organic matter concentration, and it is the main source of "turbidity" in the water environment.
- As the "last line of defense in end - of - pipe treatment", the monitoring data of sewage treatment plants directly reflect whether the water environment quality in the area meets the standards.
Based on this, this inspection covered 225 key polluting enterprises in the four major industries, and verified 480 key measuring instruments such as COD on - line monitors, ammonia - nitrogen analyzers, electromagnetic flowmeters, and pH meters. During the verification, it was found that 122 enterprises had problems such as "expired instrument calibration", "loose data transmission module", and "falsified operation and maintenance records". These seemingly "minor problems" are actually the "root causes" of data distortion. For example, the COD monitor of a paper - making enterprise had not been calibrated for 3 months, and the data was 20% lower than the actual value, directly leading to the false conclusion of "meeting the emission standards". Through rectification within a time limit, all 122 enterprises completed instrument calibration or replacement, completely solving the problems of "falsely low data" and "monitoring failure" from the equipment end, and making the enterprise's pollution - discharge data truly "traceable and trustworthy".
Targeted measures to build a full - process system: From "single inspection" to "long - term management and control"
To avoid the problem of "only conducting inspections without follow - up", the Dongguan Branch, in combination with the industrial structure and environmental protection needs of Dongguan, has designed a closed - loop strategy of "precise focus + collaborative linkage + dynamic management", and transformed the "accurate measurement" into the ability for regularized supervision.
Breaking the deadlock through regional focus: In view of the industrial characteristics of the towns and streets in the water - town area (including Zhongtang, Machong, Wangniudun, etc.), where nearly 60% of Dongguan's traditional high - pollution enterprises (with clustered development of papermaking and dyeing industries) are concentrated, this area is selected as the "key breakthrough point". By "grasping the clusters and driving the whole", the verification of 112 enterprises in this area was completed in only 10 working days, quickly forming a "demonstration effect" and prompting enterprises in other towns and streets to cooperate actively.
Enhancing efficiency through coordinated collaboration: Relying on the "List of Polluting Source Enterprises" of the municipal environmental protection department, accurately identify the enterprises and equipment that need to be verified. The list covers information such as the pollution discharge types of enterprises, major pollutants, and the models of monitoring equipment, avoiding "blind investigations" and achieving "no omissions within the list and no dead - ends outside the list".
Special inspection as a safeguard: Establish a special team composed of metrological verification experts and environmental protection technical backbones, and conduct a comprehensive verification by adopting the method of "checking each enterprise, calibrating each device, and comparing each parameter". For example, for the heavy metal monitor of a circuit board enterprise, not only the "indication error" is calibrated, but also the "data transmission delay" is verified - to ensure that both the "metrological performance" and the "practical performance" of each instrument meet the standards.
Consolidating effectiveness through a long - term mechanism: Establish the "Archives of Key Energy - consuming and Polluting Enterprises", which include the enterprises' basic information, equipment models, calibration cycles, operation and maintenance records, and rectification tracking status. The archives are subject to "dynamic updates": When an enterprise adds new equipment, it should be promptly included in the verification plan; after the rectification is completed, mark it as "qualified" and conduct a 3 - month follow - up; when the production process changes, re - evaluate the metering requirements. Through the "one enterprise, one archive" approach, shift the supervision from "single inspections" to "regular follow - ups" to completely eliminate the hidden danger of "problem recurrence".
The significance of this inspection and verification lies not only in "calibrating 480 pieces of equipment", but also in a systematic breakthrough in the field of environmental metrology supervision in Dongguan. By incorporating "measurement accuracy" into the "pre - stage" of pollution control and using "traceable numbers" to force enterprises to fulfill their environmental protection responsibilities, it provides "visible and trustworthy" metrological support for environmental quality assurance during the two festivals and the subsequent green transformation of the industry.