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Latest wastewater treatment methods
2017-03-14817
There are many ways to treat wastewater. Its purpose is to separate the pollutants in the wastewater by some means, or to decompose them into harmless and stable substances, so that the wastewater can be purified. In general, it is necessary to prevent the infection of poisons and germs, and to avoid the visible objects with different smell and bad feeling, so as to meet the requirements of different uses.
Zero discharge of nickel containing wastewater is the main source of nickel containing wastewater in electroplating production, which mainly comes from angle stripping solution, chemical solution, waste plating solution, etc. after the nickel plating bath is used for a long time, iron, copper, zinc plasma will accumulate, in addition, some organic additives will be damaged and lost, resulting in various quality problems of plating layer. The so-called "zero emission" refers to the activity of infinitely reducing pollutant and energy emissions to zero: that is, using clean production, 3R and ecological industry and other technologies to realize the complete recycling of natural resources, so as not to leave any waste to the atmosphere, water and soil.
The system is composed of two parts: the raw water pretreatment part and the reverse osmosis part. The concentrated solution of the primary RO system is sent to the secondary RO unit by the secondary delivery pump for circulating concentration. The wastewater treatment capacity of the secondary concentration system is 0.2m3/h, and the concentration of nickel ion in the wastewater is about 16000-1800mg / L, ph5-7. After evaporation, the concentrated solution is directly returned to the electroplating tank for use.
The effluent treated by RO membrane system is mainly used for nickel plating rinse water. Because the working temperature of nickel plating solution is 55-60 "C, a large amount of water evaporates during the plating process, so the dilute nickel plating solution (when the amount is small) discharged from the concentrated solution of RO device can be smoothly added into the nickel plating bath for reuse. The whole system has been running steadily since April 2005, and all indexes have basically met the design requirements.
From the actual operation results, the nickel recovery rate of the membrane nickel recovery system reaches 99.96%, and the water recovery rate reaches 100%, which meets the design requirements. In this scheme, not only water resources but also nickel resources are recovered from rinsing wastewater. The concentrated solution after 5 o times concentration by the membrane system is directly returned to the electroplating tank as the supplementary water for the production process. The scheme has the advantages of simple treatment process, simple maintenance and no secondary pollution, and completely realizes the zero discharge of nickel plating wastewater.
The role of RO membrane is very important in the treatment of wastewater containing nickel. The membrane will be polluted in the treatment of wastewater. Ro element will be polluted by inorganic salt and microorganism, which will lead to the overall increase of equipment cost. RO membrane must be placed in a clean plastic bag during equipment maintenance to avoid reaction with substances in the air.
With the rapid development of electroplating, there are also some problems. Only by solving the problem of waste water pollution can we realize clean production. The nickel containing wastewater treatment equipment of our company adopts membrane separation technology, which can effectively treat wastewater and recover nickel at the same time. The automation level of the equipment is high and the overall operation is safe and stable.
The content of water in electroplating wastewater is very complex. It needs to be pretreated first. It can enter the raw water tank through the waste water, and increase the pressure through the lifting pump to the bag filter, so as to remove the suspended matters and colloidal matters. Then use the oil removal filter and security filter to remove organic matters and oxides. Then the desalination rate in the wastewater reaching the primary RO system is very high. Some of them enter the secondary RO system with a concentration multiple of 5. After evaporation, the concentrated solution is directly returned to the electroplating tank for use.
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