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Study on Reverse Osmosis Application in the Treatment of Nitrogen Wastewater

Author: HouYanQing
Tutor: YiXiu
School: Chang'an University
Course: Environmental Engineering
Keywords: Ammonia wastewater RO Process Design Economic Analysis
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 299
Quote: 3
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Abstract


With the rapid development of industry and agriculture, ammonia pollution more widely, its emissions are growing. In addition to sewage, animal waste, there are a large number of industrial wastewater and landfill leachate are rich in ammonia. Ammonia is a major cause of eutrophication pollutants. Therefore, cost-effective environmental control ammonia wastewater research workers is an important topic. Paper production process based on zinc oxide generated in the ammonia wastewater characteristics, the two reverse osmosis concentration process of reverse osmosis treated water returned to the process recycling, reprocessing concentrate recovery of ammonia. The process of opening an ammonia wastewater treatment economical, environmentally friendly, reliable way, has important theoretical significance and practical value. Through experimental research, made the following findings: (1) a reverse osmosis system operating pressure stabilized at 1.0Mpa ~ 1.4Mpa, water and concentrated water system pressure at 0.10Mpa less; second reverse osmosis system operating pressure stabilized at 4.8 ~ 5.0 Mpa, water and concentrated water system differential pressure 0.10Mpa less; once reverse osmosis desalination rate remained stable at 98%, the second reverse osmosis desalination rate is over 99%; entire reverse osmosis system running in good condition . (2) adjusting the pH of the wastewater in 7 or less, reverse osmosis systems for ammonia treatment effect is the most stable, wastewater treatment by reverse osmosis effluent ammonia content of 20mg / L or less, conductivity 150μs/cm less, meet nano zinc oxide production process right back to the water requirements of the standard. (3) pretreatment process of reverse osmosis systems plus media filter using coagulation process fully meet the reverse osmosis water SDI lt; 5 requirements. Ultrafiltration as compared to RO pretreatment process, coagulation plus media filtration process is conducive to reduce investment costs and operating costs. (4) through the wastewater treatment capacity of 1000 tons / day engineering design and analysis, equipment operating cost is 1810 yuan / day; equipment by 1.5 million total investment calculations, equipment life of 20 years calculated cost is 206 yuan equipment / day; wastewater recycling economic gain is 2405 yuan / day; final calculation results using reverse osmosis treatment process ZnO economic benefits is 389 yuan / day, a year's revenue was approximately 142,000. Therefore, the use of reverse osmosis water treatment process as the core not only has significant environmental benefits, but also has some economic benefits.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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