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At the invitation of the Guangdong Academy of Environmental Sciences, Denggao Environmental Technology Co., Ltd. ("Denggao") joined hands with the team of Professor Zhu Guangcan from the School of Energy and Environment at Southeast University to hold a special technical exchange seminar on "Key Technologies and Industrial Applications of Rural Blackwater Resource Recovery". The meeting featured in-depth discussions on core topics including rural domestic wastewater treatment challenges, resource recovery technology implementation, operation cost reduction, and ecological benefits, providing technical references for rural environmental governance in Guangdong Province.
Industry-Academia-Research Collaboration: Technology Deployment & Industrial Transformation
Denggao and Professor Zhu Guangcan's team have maintained long-term, deep cooperation, focusing on bacterial strain domestication, tank design, and filter media R&D. During this exchange, both parties highlighted their jointly advanced technical system: "Source Separation — Biological Enhancement — Resource Reuse".
Core Technologies
●Micro/Low-Water Flush Toilet Systems:
Promoting micro-water flush cutting-suction toilets (single flush volume: 0.5–1L) and foot-pedal low-water flush toilets (single flush volume: 800–1000mL) to achieve fecal sludge source reduction and black-grey water separation.
●High-Efficiency Anaerobic Fermentation Bacterial Agents:
The composite bacterial agents domesticated by Denggao Environmental (primarily composed of Firmicutesand Proteobacteria) accelerate organic matter decomposition, showing results within 4 days and efficiently inactivating fecal coliforms and ascaris eggs within 10 days. Once dosed, septic tanks can operate for years without desludging.
●Nitrogen & Phosphorus Enrichment Filter Media:
Utilizing sodium acetate-modified zeolite (MSZ) and magnesium-impregnated calcined biochar for downstream nitrogen and phosphorus recovery. Saturated filter media can be repurposed for soil amendment.
Practical Case Studies
●High-Altitude Demonstration in Tibet: In Xiangmu Village, Jiacha County, Shannan City, Tibet (altitude 3,400m), Denggao's equipment operated stably. Tests confirmed the biogas slurry complied with the Technical Specifications for Biogas Fertilizer Application(NY/T 2065-2011).
●Pilot Project in Sheyang, Yancheng, Jiangsu: Adopting a "Fractional Treatment + Prioritizing Resource Recovery" model, converting front-end blackwater into fertilizer and recovering excess nitrogen and phosphorus via backend filter media.
On-Site Discussion
Addressing key concerns raised by the Guangdong Academy of Environmental Sciences, both parties provided the following responses:
Topic | Solution from Denggao & Prof. Zhu's Team |
|---|---|
Bacterial Agent Dosing Point | Dosing at the front-end (septic tank) yields better results, enabling simultaneous decomposition, deodorization, and inactivation. Supplementary dosing is possible if terminal collection devices exist. |
Pathogen Inactivation | Bacterial agent-catalyzed maturation takes approx. 6 days; large-scale septic tanks may require up to 20 days. |
Greywater Surfactants | Enhanced anaerobic pretreatment can degrade levels to below 5 mg/L. |
Soil Salinization | While the Academy expressed concerns, Prof. Zhu noted that the humification process promoted by the bacterial agents can sequester nutrients, emphasizing the need for enhanced long-term monitoring. |
Operation & Maintenance Monitoring | Recommended method: "Regulating tank water level changes + pump operation data" for estimation. The Taihu Lake Basin utilizes spectral analysis methods. |
Next Steps
Chairman Deng of Denggao pointed out that the current widespread practice of applying "industrial wastewater treatment logic to rural sewage" leads to process mismatches and excessive operation costs. Guangdong's rural wastewater governance requires alignment with provincial conditions, focusing on:
●Promoting black-grey separation + micro/low-water flush toilet models.
●Applying non-powered/micro-powered greywater treatment technologies (e.g., six-compartment purification tanks, modular constructed wetlands).
●Establishing a comprehensive evaluation system covering "Technology—Ecology—Environment—Carbon Emissions—Economy—Society."
