It is well-recognized that chemical wastewater poses significant hazards. Containing large quantities of harmful substances, direct discharge of such wastewater will impair soil and water sources, and even pose substantial threats to the health of flora, fauna and human beings. Therefore, effective prevention and control measures for chemical wastewater shall be implemented. This article, in collaboration with manufacturers of Online Qater uality Monitoring Instruments, elaborates on relevant solutions from the following perspectives:

1. Strictly control pollutant discharge and reduce industrial pollution. For highpolluting sectors such as the chemical industry, promote closedloop wastewater recycling toward zero-discharge targets, and strengthen supervision and audit over pollutant discharging entities.
2. Accelerate the development of watersaving industries. Further study industrial watersaving management measures, standardize corporate water-saving scope, and enforce water-use quotas and water saving standards for key water polluting industries.
3. Vigorously advance urban wastewater treatment and resource utilization to fundamentally prevent deterioration of urban water environment. Improve urban drainage systems and upgrade urban wastewater treatment technologies. For cities with insufficient supporting facilities, arrange the construction of reuse facilities alongside wastewater treatment facilities in planning, so as to conduct advanced treatment of wastewater.
4. Attach importance to the development of organic and eco-friendly agriculture for comprehensive non-pointsource pollution prevention and control. For instance, increase the application of organic fertilizers to mitigate water pollution caused by agricultural non-point sources.
5. Adopt targeted measures to protect marine ecosystems.
6. Allocate water resources to guarantee ecological water demand. On the premise of water resource development and utilization while safeguarding water environment functions, take river‑basin water demands into account, and issue relevant permits based on the total allowable water resource exploitation volume.
7. Give priority to water quality protection for drinkingwater sources. Formulate protection regulations for both urban and rural drinkingwater source areas, for example, impose strict restrictions on various activities within water source protection zones.
8. Strengthen control over persistent organic substances. Substances such as pesticides are widely applied in agriculture, leading to high levels of persistent organic pollutants in water bodies, hence relevant control shall be enforced.
9. In addition, importance shall be attached to Online Water Quality Monitoring. This operation analyzes the content of various harmful substances in water. By comparing analyzed data against relevant standards, it can judge whether water quality meets the requirements for discharge or recycling.