| A hosiery group, which relying on the abundant strict scientific management and technical force, has developed into a well-known in north China of a professional company specialized in the production of various kinds of socks since its establishment,and won the majority of users favor with its exquisite technology and excellent quality. However, many adverse factors has been brought, such as the change of product, dyestuff, and water quality fluctuation as the company scale expands unceasingly. As a result, transformation of the original wastewater treatment project construction for this group is imminent. Then the large amount of waste resources will be consumed in the process of production, with cause waste for discharge of a large number of wastewater, so the wastewater after advanced treatment for resource use is a crucial way to reduce pollution and enterprise operating cost. The main content of the study is to put forward the exiting environmental problems, based on the current situation analysis of the project, pollutant discharge and controls measures that adopted at present based on the current situation analysis. The feasible sewage treatment retrofit scheme should been formulated to ensure the discharge of wastewater, that produced from company, meet 《The Standard of Textile Dyeing and Finishing of Industrial Water Pollutant Discharge》; recycle water meet《The Classification of Urban Sewage Recycling》GB/T18919-2002; 《The Quality of Mixed City Water》 GB/T18920-2002; 《The Quality of Environmental Water》GB/T18921-2002; and the recycle water are used for production, the workshop group flush and circulating cooling water. The construction scale project has been determined as 1200 t/d according to the hosiery group of the current production situation, the quality and amount of water; at the same time, the recycling water scale has been determined as 600 t/d based on the principle of sustainable utilization of water resources and the requirement of the enterprise. The final construction schemes is:Hydrolytic Acidification + Aerobic Pond + Secondary Sedimentation Tank + Air Flotation, and the wastewater deep treatment part is Flocculation Precipitation + Filtration + Disinfection, which has been selected after the determination of the project general situation, basic information and the construction condition. To ensure recycle water meet quality goals, we detailed plan designs, analyzed the environmental impact assessment and other project specific content of the plan.The study made feasible retrofit scheme of depth of sewage treatment and detailed design according to actual situation, at the same time, this research conformed the national Songhua river basin water pollution prevention and control planning, and meet the current energy conservation and emissions reduction and the development of the strategic thought of circular economy. The study has a high removal rate of pollutants and simple operations by the mature processing methods, meet effectiveness of dyeing wastewater discharging standard. And this study has obvious environmental, economic and social benefit, at the same time has great significance on recycling utilization of resources and environmental protection. |
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