Confronting Extreme Sustained High Temperatures in Southern China
Entering mid-to-late July, southern China has entered a period of sustained extreme high-temperature weather. The Jiangxi region has maintained temperatures above 35℃ for 3 to 5 consecutive days, with temperatures expected to climb to 37℃ in the coming days; Changsha in Hunan and other areas have even broken records with extreme highs of 37–39℃. Persistent sunny heat, soaring water temperatures, and thermal stratification have led to ecological imbalance in rivers and lakes, algal outbreaks, and pressure on industrial wastewater biochemical systems, marking the year's greatest test for southern water environment treatment.
In the face of this round of large-scale extreme heat, environmental protection peers across regions have reported: cyanobacteria in rivers and lakes nationwide are entering a concentrated outbreak phase, with greatly increased treatment difficulty, recurrence probability, and control pressure. As a core technology enterprise in microbial water environment treatment in southern China, Jiangxi Diaoshuiren Ecological Environment Engineering Co., Ltd. quickly activated its high-temperature emergency service mechanism, with technical teams deployed across all areas, expedited laboratory testing, and full supply of heat-resistant special bacterial strains, providing all-around protection for the stability of southern water ecosystems and compliant operation of industrial wastewater treatment.
During this heat wave, Jiangxi Diaoshuiren's technical engineers and sampling personnel traveled to key treatment sites including large and medium-sized lakes, backup drinking water sources, urban park landscape lakes, and county-level river systems to carry out field surveys, water sampling, algal phase assessment, and on-site condition diagnosis.
Recently, the company's laboratory has seen explosive growth in water sample testing volumes, receiving as many as thirty-plus water samples from rivers and lakes nationwide in a single day at peak, covering project sites across multiple southern provinces including Jiangxi, Hunan, Hubei, Guangdong, Guangxi, and Fujian.
Through analysis of large batches of water sample data, the technical team has precisely identified the latest patterns of algal phase changes during the summer heat of 2026:
1. This round of water pollution is absolutely dominated by cyanobacteria blooms, with green algae accounting for an extremely low proportion;
2. The algal phase structure has changed significantly, no longer showing the single-dominant Microcystis model of previous years;
3. The current dominant algal species in water bodies have shifted to Oscillatoria and Anabaena, supplemented by Spirulina and small amounts of Microcystis, making the algal phase more complex, more heat-tolerant, more drug-resistant, and more stubborn to treat.
The structural variation in the algal phase means the effectiveness of conventional algae treatment schemes has declined significantly; only by relying on high-temperature-adapted, targeted microbial strains and customized regulation processes can long-term algae control and water stabilization/purification be achieved.
High temperatures pressure industrial wastewater, demand for heat-resistant nitrifying/denitrifying strains surges
Sustained extreme heat affects not only natural river and lake ecosystems but also delivers a huge shock to industrial wastewater and aquaculture wastewater biochemical systems. High-temperature environments can easily cause activity decline in ordinary biochemical bacterial strains, sludge aging, reduced denitrification efficiency, and exceedance of ammonia nitrogen and total nitrogen standards.
Recently, problems have erupted intensively in aquaculture wastewater and textile dyeing industrial wastewater projects in South China regions such as Guangdong and Guangxi, and market demand for heat-resistant acclimated nitrifying strains and denitrifying strains has surged explosively.