The National Ammonia Wastewater Treatment New Technology Site Meeting was successfully concluded in Xuzhou, Jiangsu. Representatives from Shandong Feida Chemical Technology Co., Ltd. and Henan Xinyang Asia New Energy Co., Ltd., which have implemented advanced pollution control technologies, delivered speeches at the event. The remarkable results and significant benefits of these new processes demonstrated that the technology is a crucial guarantee for energy saving and emission reduction.
Huang Huayao, director of the Xuzhou Institute of Water Treatment, one of the organizers, introduced 168 representatives from 86 synthetic ammonia enterprises to the ten major energy-saving and emission reduction technologies for treating synthetic ammonia wastewater. This approach emphasizes controlling pollution at the source before treating the end. He also addressed various questions raised by company representatives regarding sewage treatment.
The meeting also included a site visit to another organizer, Shandong Hengtong (Lucheng) Chemical Co., Ltd. The company adopted a combination of pollution control at the source and at the end. With an investment of 15 million yuan, they reduced total wastewater from 250 cubic meters per hour to 80 cubic meters per hour, and drainage to 3-4 cubic meters per ton of ammonia. This resulted in annual savings of over 10 million yuan in sewage treatment costs and disposal fees, with the entire investment recovered within two years.
Delegates observed the external drainage on-site, where the chemical oxygen demand of the effluent was less than 60 mg/l, ammonia nitrogen less than or equal to 15 mg/l, and total nitrogen less than or equal to 30 mg/l. All indicators met and exceeded the drainage standards for large-scale nitrogen fertilizer companies. Thanks to the advanced technology, practicality, low investment, and good results, the visit left the delegates deeply encouraged, realizing the original intention of the on-site meeting: to provide practical technology services to enterprises, promote energy saving and emission reduction in synthetic ammonia companies, and achieve zero emissions.
The ammonia industry is a major water user and a significant source of sewage. China's ammonia industry consumes an average of 58 tons of ammonia and 2.7 billion tons of water annually, while discharging 2.13 billion cubic meters of water and emitting 0.990 million tons of pollutants each year. The wastewater contains high levels of pollutants such as ammonia nitrogen, chemical oxygen demand, cyanide, and sulfide, requiring multiple treatments before reaching discharge standards.
The Xuzhou Institute of Water Treatment has developed 10 advanced wastewater treatment technologies after years of research and follow-up services. These technologies emphasize "source control, end treatment, and linkage treatment," providing targeted and practical solutions. After implementing the full set of technologies, enterprises can reduce external drainage by more than 70%, cut material usage by over 60%, and lower end-of-pipe treatment investment and processing costs by 40% to 60%. This helps the ammonia industry address its large-scale pollution problem effectively.
**Reporter's Notes:**
1. **Gasification Wastewater Micro-Vortex Treatment Technology:** This technology focuses on deep purification, enhanced cooling, and water quality adjustment. It uses water-in-water technology, achieving zero emissions with minimal investment and cost. For example, Zhejiang Great Group has not discharged sewage for four years using this technology. It has been adopted by over 100 companies, with a treatment cost of only 0.03 yuan per cubic meter. Evaluated as a cyclical economic support technology for the nitrogen fertilizer industry from 2007 to 2010, it reduces pollutants by 60% to 70%.
2. **Circulating Cooling Water Concentration and Emission Reduction Technology:** This technology increases the concentration multiple of circulating cooling water from 2 to 4-6 times, reducing sewage by 70% to 80%. It involves selecting excellent agents and processes, along with new types of rare earth filter media. The dosing treatment cost does not increase by 30%, and the water quality remains clean.
3. **Desulfurization Circulating Water One-Way Purifier Technology:** This technology solves long-standing issues in desulfurization and circulating water treatment. Jiangsu Hengsheng Chemical Group used two sets of one-way purifiers to improve cooling and sulfur removal effects. The equipment investment is small, and the treated water cost is less than 0.1 yuan per cubic meter.
4. **Urea Analytical Solution Advanced Treatment and Reuse Technology:** This technology uses low-pressure, low-temperature catalysis to process and reuse urea solution. It saves over 80% of the investment compared to deep hydrolysis technology, turning wastewater into desalinated water. It can recover investment in one year, with no secondary pollution. Over 100 urea plants have adopted this technology, saving 400-500 million yuan.
5. **Methanol Residue and Dimethyl Ether Residue Treatment Recycling Technology:** This technology treats high-concentration organic contaminants, solving the issue of organic acid corrosion. The backwater reaches desalinated water standards, yielding several hundred thousand yuan annually. It offers a new approach to wastewater treatment, both cost-effective and profitable.
6. **Oily Sewage Purification Technology:** This technology uses a special oil purifier to treat oily sewage, using purified water for circulating water. It reduces processing costs significantly, avoiding the need to discharge untreated oily sewage into the plant’s system. It saves money and achieves better results.
7. **pH Standard Technology for Off-Line Wastewater:** This technology uses ion exchange methods to recover excess acid and alkali, achieving standard wastewater without neutralizing pH. It reduces renewable acid and alkali use by 20-30%, improving efficiency and reducing pollution.
8. **Ammonium Nitrate Wastewater A/B Bed Treatment Reuse Technology:** This technology recycles 100% of ammonium nitrate wastewater, solving a difficult problem for trapped enterprises. It increases nitrate concentration for recycling, with treated water quality suitable for boiler replenishment. The cost is only 0.1-0.2 yuan per cubic meter, with investment being a quarter of electrodialysis technology.
9. **A/SBR Short-Cut Nitrification New Process:** This technology addresses the shortcomings of traditional A/O processes, achieving three breakthroughs: reducing carbon source and oxygen use, lowering sludge production, and improving total nitrogen removal rates. It has become a leading process for ammonia nitrogen removal and was rated as a national key environmental protection technology in 2008.
10. **Wastewater Recycling Treatment Technology Up-to-Standard Emissions:** This technology determines the appropriate reuse method based on salt content. For wastewater with salt content below 1000 mg/L, shallow salt removal technology is recommended, with low investment and high reuse rate. For higher salt content, other methods are used, though they may be more expensive.
**Representative Li Nawei (Director of Shandong Sinochem Plain Chemical Group Co., Ltd.):**
Plain Chemical Co. produces 1.2 million tons of ammonia and methanol annually. They adopted the source control technology of the Xuzhou Institute of Water Treatment, reducing ammonia drainage to 3-4 cubic meters per ton. Despite large production scale, they invested only 17 million yuan, achieving wastewater treatment goals and saving 20-30 million yuan compared to similar enterprises. Their wastewater treatment plant has been running smoothly since 2007, meeting all environmental standards and preparing for future wastewater reuse.
**Yin Yin Xue (Deputy Director of Shandong Feida Chemical Technology Co.):**
FeiDa Chemical Group selected the A/SBR short-cut nitrification technology from the Xuzhou Institute of Water Treatment. Their design capacity is 1,920 cubic meters per day, with influent COD 1,000 mg/L and ammonia nitrogen 600 mg/L. The treated water meets strict provincial standards, with a cost of 1.13 yuan per cubic meter. The process shows strong load impact resistance, achieving over 95% removal rates for ammonia nitrogen and total nitrogen.
**He Xinxin (Director of Anhui Sanxing Chemical Company):**
Samsung Chemical Co. adopted advanced pollution control concepts from the Xuzhou Institute of Water Treatment. Their wastewater discharge has significantly decreased, with 2 million tons of wastewater discharged in 2010. They saved 700,000 yuan annually on alkali and methanol costs, with a total investment of 5.1 million yuan. The A/SBR process achieved excellent results, meeting the first-class external drainage standards.
**Cao Xuebin (Deputy Director of Shandong Hengtong Chemical Co., Ltd.):**
Hengtong Chemical chose the A/SBR short-cut nitrification process after evaluating four options. The designed capacity is 2,160 cubic meters per day, with a cost of 2,975 yuan per cubic meter. The actual performance exceeded expectations, with significant savings in investment and operational costs. They achieved zero emissions and improved environmental compliance.
**Chang Zhengzheng (Director of Henan Xinyang New Energy Company):**
Asia New Energy Corporation selected the A/SBR short-cut nitrification process, meeting local environmental standards. The project was completed in 2007, with a total investment of 4.82 million yuan. The treated water met design values, with a cost of 1.2-1.5 yuan per cubic meter. The process showed stable performance, with rapid commissioning and consistent water quality.
In conclusion, the adoption of these advanced technologies has proven to be a game-changer for the ammonia industry, helping companies meet stringent environmental standards, reduce costs, and achieve sustainable development. The success stories shared during the meeting highlight the importance of innovation and collaboration between enterprises and research institutes in addressing complex environmental challenges.
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