At least two sets of fluorine-containing wastewater treatment systems shall be set up, one for use and one for standby, with two-stage treatment. The HF wastewater is first lifted from the homogenization tank by the water pump to the first reaction tank, where Ca(OH) is used to adjust the pH to partially generate calcium fluoride and then flow into the second reaction tank.
Precisely adding CaCl2 in the second reaction tank will completely react with the fluorine in the wastewater, and at the same time finely adjust the pH value to the optimum point. Then the wastewater flows into the coagulation tank and the coagulant (PAC) is added to form flocculent clusters, and the fully reacted wastewater flows into the flocculation tank again.
Reducing fluoride ions
Add flocculant (PAM-) in the flocculation tank to further coagulate the alum and then flow into the sedimentation tank for mud-water separation.
The main purpose of the second-stage treatment process is to further reduce the concentration of fluoride ions. The clean water overflowing from the sedimentation tank flows into the water production tank.
Treated wastewater
During the process, continuous online detection of F- is carried out, and automatic judgment is made
During the process, continuous online detection of F- is carried out, and automatic judgment is made according to the water quality of each stage of treatment.
The treated wastewater is pressurized by the water pump and transported to the wastewater neutralization treatment system for further treatment. If the fluorine test index is not up to standard, the water will be discharged to the emergency pool.
Fluorine and Ammonia Wastewater Process
The treatment of ammonia-containing and fluorine-containing wastewater is carried out by manganese sand + RO concentration + secondary air stripping + pickling absorption process. The wastewater will be adjusted PH first and then enters the manganese sand tower to remove Hydrogen peroxide.
After being filtered by activated carbon and a security filter, it enters the RO device for concentration. The permeated water of the RO device is discharged into the middle water tank for reuse after passing the test; the pH of the concentrated solution is increased to 10.5~11.5 by adding NaOH.
Ammonia-containing waste gas
After passing through the heat exchanger, the temperature is raised to 45 ℃ ~ 50 ℃, and the ammonia in the wastewater is stripped out through the secondary stripping tower.
The ammonia-containing waste gas from the stripping tower enters the absorption tower and is acid washed with a sulfuric acid solution to form an ammonium sulfate solution.
Secondary stripping treatment
The qualified wastewater is pumped to the hydrofluoric acid wastewater treatment system for further treatment
After the secondary stripping treatment, the qualified wastewater is pumped to the hydrofluoric acid wastewater treatment system for further treatment, and the unqualified product water is returned to the original water tank of the fluorine ammonia system.
The resulting ammonium sulfate solution is sent outside the plant for processing by professional contractors.
Ammonia Nitrogen wastewater process
Ammonia nitrogen wastewater is treated by manganese sand + RO concentration + secondary air stripping + pickling absorption process for treatment. Ammonia-containing and fluorine-containing wastewater is first adjusted by pH and then enters the manganese sand tower to remove hydrogen peroxide.
After being filtered by activated carbon and a security filter, it enters the RO device for concentration. The water passing through the RO device is discharged into the middle water tank for reuse after passing the test.
pH increase
The concentrated solution increases the pH of the wastewater to 10.5~11.5 by adding NaOH. After the temperature is increased to 45℃~50℃ by the heat exchanger, it is sent to the packing stripping tower to strip the ammonia in the wastewater.
After the secondary stripping treatment, the qualified wastewater is transported by the pump to the acid-base neutralization treatment system for further treatment and discharge, and the unqualified product water is returned to the original water tank of the ammonia nitrogen system
Plant processing
Ammonia is dissolved in the sulfuric acid solution to form an ammonium sulfate solution
The ammonia-containing waste gas from the stripping tower enters the packed absorption tower and is acid washed with a sulfuric acid solution, and ammonia is dissolved in the sulfuric acid solution to form an ammonium sulfate solution.
The resulting ammonium sulfate solution is sent outside the plant for processing by professional contractors.
CMP Wastewater Process
The CMP wastewater is first lifted from the homogenization tank to the first-stage reaction tank by the water pump. After the pH of the reaction tank is adjusted, it enters the second-stage reaction tank due to gravity.
Add flocculant (PAC) in the fast mixing tank to accelerate the formation of flakes, and the fully reacted wastewater flows into the slow mixing tank. Add coagulant (PAM) into the slow mixing tank to make the alum flowers continue to grow, and then flow into the inclined plate sedimentation tank for mud-water separation, and the overflowing clean water flows into the water production tank.
Detection
The SS index is detected by continuous online instruments, and the qualified wastewater is pressurized by the water pump and transported to the wastewater neutralization treatment system for further treatment.
If the detection tank detects that the wastewater does not meet the qualified standard, it will automatically cut into the emergency water tank, and the substandard wastewater will be introduced into the emergency tank for temporary storage, and then the wastewater will be pumped back to the CMP wastewater treatment system and the tank for further treatment until it is qualified.
Copper Wastewater Process
Finely adjust the PH value of wastewater in the second-stage reaction tank, and add flocculant (PAC)
The copper-containing wastewater is firstly lifted by the water pump from the homogenization tank to the first-stage reaction tank, where the pH is adjusted and copper hydroxide is formed, and then enters the second-stage reaction tank due to gravity flow after precipitated.
Finely adjust the PH value of wastewater in the second-stage reaction tank, and add flocculant (PAC) in the coagulation tank to form flocculent flowers, and the reacted wastewater flows into the flocculation tank.
Online detection
Add coagulant (PAM) to the flocculation tank to make the alum blooms continue to grow, and then flow into the sedimentation tank for mud-water separation, the overflowing clean water flows into the water production tank. Continuous online detection of Cu2+, the qualified wastewater is pressurized by the water pump and transported to the wastewater neutralization treatment system for further treatment.
If the detection tank detects that the wastewater does not meet the qualified standard, it will be automatically introduced into the emergency tank, and the substandard wastewater will be introduced into the emergency tank for temporary storage, and then the wastewater will be pumped back to the copper-containing wastewater treatment system and tank for further treatment until it is qualified.
Domestic sewage treatment system process
A single set of domestic sewage treatment systems can be set up. The treatment of domestic sewage adopts the buried integrated A/O process for treatment.
The treated water is upgraded to the first-stage pH adjustment tank for treatment and discharge.
Acid-base wastewater process
The acid-base wastewater self-leveling tank relies on gravity to flow through the neutralization reaction tank
Generally, non-recyclable inorganic acid-base wastewater, pure water station acid-base regeneration wastewater, and other qualified wastewater are all concentrated in this system for treatment.
The acid-base wastewater self-leveling tank relies on gravity to flow through the neutralization reaction tank and the effluent detection tank, and the pH value, TOC, TCu, SS, NH4OH, TP, TN, F-concentration are continuously detected online in the effluent detection tank.
Water quality test
If the water quality test results meet the wastewater discharge standards, the effluent will be directly discharged into the outdoor drainage pipe network
If the water quality test does not meet the wastewater discharge standard, close the drain valve and introduce the substandard wastewater into the emergency water tank for temporary storage by suction and pressure by the emergency pump, and then use the water pump to pump the wastewater back to the corresponding system for further treatment until it reaches the standard discharge.
