Wastewater control in forged stainless steel forging workshop
There are some requirements for wastewater control in forged stainless steel forgings.
1. The cooling water and tool cooling water of the heating equipment should be recycled repeatedly to minimize the amount of fresh water and reduce the discharge of industrial wastewater. Industrial wastewater and domestic sewage should be discharged separately, and turbidity and diversion should be carried out. Cooling circulating water should meet the requirements.
2. When using clean gas, set the supporting aeration tank according to the regulations to treat phenol-containing wastewater; when using hot gas, the phenol-containing wastewater should be extended as much as possible, and should not be arbitrarily overflowing. When it needs to be replaced, it should be concentrated and treated by chemical oxidation or adsorption, and should not be discharged at will.
3. The oily wastewater in the workshop must be injected into the oil separation area. The heavy oil and oil slick are removed by gravity separation and coarse flotation, and the purification treatment is discharged after reaching the standard. The professional forging plant in the multi-shop will discharge the oily wastewater into the discharge port by pipeline or open channel, and use the grease trap, air flotation and oil-water separation device to discharge the oil and water to meet the standard.
4. According to the material, shape and size of different stainless steel forgings, use less polluted oil-free smokeless forging die lubricant to minimize the amount of lubricant.
5. Forgings are cleaned as much as possible without pickling. When the pickling process is adopted, the pickling waste liquid is strictly free to be discharged, and the valuable waste acid should be concentrated and recovered. The pickling residue is discharged after neutralization treatment and should meet the discharge standard.
6. The acid-containing wastewater can be treated by alkaline waste, lime neutralization, and filtration neutralization. The lime neutralization method should have a stirring and sedimentation tank, and the treated waste residue is transported away in time after dehydration and solidification.
7. Extend the cleaning solution usage time as much as possible and reduce the alkali concentration. When there are both alkali-containing wastewater and acid-containing wastewater in the workshop, the waste water residue should be neutralized with each other to achieve comprehensive treatment.
8. The use of oil and hydraulic transmission devices and equipment containing emulsion should be set up with special pipe trenches, and the bottom of the bottom of the ditch should be equipped with oil collecting pits and oil collecting devices. The waste liquid should not be discharged directly into the sewage pipe.
9. Lubrication systems of various types of equipment should be reliably sealed, and oil should not leak from pipes, valves and burners in the oil circuit system. The hydraulic foundation floor and trenches shall be coated with anti-seepage paint.
10. The emulsion wastewater is separated from other wastewater. The treatment system should be set separately, and the wastewater should be discharged by air flotation, electro-floating, coagulation and sedimentation, and discharged into the sewer after slag removal, demulsification, degreasing and purification treatment.
11. Waste water exceeding the standard in the workshop must be discharged into the designated trench, and it should not be discharged directly to the outside of the workshop before treatment. Waste water with water quality exceeding the discharge standard shall not be diluted to reduce concentration.
12. It is forbidden to use the seepage pit, seepage well or flooding method to discharge waste water, and the pipeline leading to the discharge port and the open channel should have anti-seepage measures.
13. When wastewater is discharged into urban sewers, it is strictly forbidden to mix flammable and explosive substances (gasoline, heavy oil, lubricating oil, etc.) and harmful substances.
14. The temperature of the discharged wastewater should not exceed 40 °C.
15. The maximum allowable emission concentration of pollutants in the workshop wastewater shall comply with the regulations.
16. Wastewater pollutants shall be sampled at the discharge outlet of the workshop or workshop. The sampled water sample must represent the true status of water quality and quantity. The determination of its pollutants shall be carried out in accordance with the standards promulgated by the State (including sampling methods and measurement standards for pollutants).