The Engineering Application With Membrane Technology In Advanced Treatment Of Printing And Dyeing Wastewater & Its Benefit Analysis

The amount of fresh water per capita in China with less, urban water consumption increase, the shortage of water resources has become an important factor restricting China’s economic and social development. Water reuse as a way to improve water recycling rate of technical means, in order to alleviate the high water consumption characteristics of printing and dyeing industry, more and more extensive application. At the same time, national and local in printing and dyeing industry, issued a series of measures, at present it is urgent to find an effective, stable and recycling process for printing and dyeing production enterprises, in order to meet the purpose of water saving, pollution reduction.This paper aimed at the printing and dyeing wastewater with two stage effluent, filtration, ultrafiltration clarification and depth of processing reverse osmosis membrane integrated process after the return for the production process.Specific include the following contents:Ultrafiltration experiment by changing the chemical cleaning reagent species and there is no gas washing adjustment, stability investigation process. The results showed:in the automatic air washing under the condition of adding DBNPA as the best operating parameters, ultrafiltration to remove the most of suspension, after after ultrafiltration water clear, water turbidity is below 1NTU, meet the requirements of reverse osmosis influent water pretreatment. By backwashing agent periodically, ultrafiltration membrane permeation liquid flow and liquid circulation flow stable flux were 1600L/H and 3100L/H, at the same time after backwashing flux recovery performance is good, operation are stable.Reverse osmosis system in the factory working conditions, continuous operation for a period of time, to study the stability of system and water quality. The results showed that:reverse osmosis influent conductivity fluctuations, water conductivity fluctuation; water conductivity and water conductivity is almost independent of the size, and maintained at a low level; at the same time to detect the effluent COD value, to achieve the relevant reuse water quality standard of design.The final analysis, economic benefits and environmental benefits of the project results show:after the project put into operation, can save water every day 2000m3, emission pollutant concentration as influent concentration meter, put into use for 330 days, the year income 884,400 yuan, the project payback period is5.28 years, the internal rate of return is 10.29%, and its economic benefits significantly less risk. And the annual emission reduction of wastewater volume was 660000 m3, CODCr132t/a reduction, BOD533 t/a, NH3-N 13.2t/a, TP 0.99t/a,the obvious environmental benefit, make a greater contribution to the local energy-saving emission reduction.