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A case of washing wastewater treatment in a machinery manufacturing enterprise in zhuhai
A machinery manufacturing company in zhuhai is a foreign-funded enterprise, mainly producing, processing and selling its own agricultural, park forestry, hardware and other machinery parts and equipment. Now the daily production of metal and motorcycle cy
Description
A case of washing wastewater treatment in a machinery manufacturing enterprise in zhuhai
1. Company facts:
A machinery manufacturing company in zhuhai is a foreign-funded enterprise, mainly producing, processing and selling its own agricultural, park forestry, hardware and other machinery parts and equipment. Now the daily production of metal and motorcycle cylinder cleaning wastewater, wastewater emulsification degree is high, containing a lot of grease and surfactant and other toxic substances, with high oil content and high COD characteristics, is a difficult treatment of wastewater.
2. On-site problems:
At present, conventional coagulants of iron salt and aluminum salt are used in wastewater pretreatment, and the removal rate of pollutants is only 20-30%. There are still a large number of unremoved oil and other macromolecular substances and suspended matter particles, which are difficult to be absorbed and degraded by microorganisms directly, resulting in the effluent exceeds the standard. The waste water that can't meet the standard is treated by take-out, and the treatment cost is extremely high.
3. Wastewater treatment:
3.1 treatment water: the designed treatment water is 45 m /d, and the actual treatment is 25-30m3/d;
3.2 treated water quality: inlet COD: 11000-30000mg/L, SS: 1000-1800mg/L, petroleum: 900-1200mg /L, TDS: 3000-6000mg/L;
3.3 treatment process:
4. Problem solving:
Since the wastewater contains A large number of emulsion and surface active substances, in the middle of the waste water into the front air flotation device groove, adding demulsification coagulant mixing reaction, make A lot of organic matter in waste water and materials such as emulsified oil and water separation, the separation of treated wastewater COD, suspended matter is reduced greatly, COD removal rate as high as 96%, at the same time can greatly improve the biological sex, after the pretreatment of waste water into the A/O biological system, the MBR membrane bioreactor treatment after the final out of the water meet the national integrated wastewater discharge standard GB8978-96 standard discharge, for owner to save each year more than 500 wastewater treatment costs.
4.1 water quality treatment data at each stage:
