In power plant wastewater, choosing the right water purifier is crucial. Generally, power plant wastewater includes cooling water, washing water, ground drainage, etc., which contains different degrees of harmful substances, such as heavy metals, oil pollution, suspended solids, etc. Therefore, choosing the right water purifier can effectively remove these harmful substances and improve the quality of wastewater. At present, commonly used water purification agents include polyaluminum chloride (PAC), polyferric sulfate (PFS), polyaluminum ferric chloride (PAF), polysilicic acid (PIS), etc. These water purifiers have different chemical properties and mechanisms of action, so it is necessary to choose the right water purifier according to the specific situation of wastewater.
Polyaluminum chloride (PAC) is a commonly used water purification agent, which has good flocculation and precipitation effect, and can remove suspended solids, colloids, color, etc. in wastewater. In addition, polyaluminum chloride can also effectively remove heavy metal ions such as lead, zinc, mercury, etc. from wastewater. However, polyaluminium chloride has a high level of ** and may cause secondary pollution.
Polyferric sulfate (PFS) is also a commonly used water purification agent, which has a good coagulation effect and can remove suspended solids, colloids, color, etc. in wastewater. In addition, polyferric sulfate can also effectively remove heavy metal ions such as copper, nickel, cobalt, etc. from wastewater. However, polyferric sulfate is high and may produce precipitates such as calcium sulfate.
Polyaluminium ferric chloride (PAF) is a new type of water purification agent, which has good flocculation and sedimentation effects, and can remove suspended solids, colloids, color, etc. in wastewater. In addition, polyferric aluminum chloride can also effectively remove heavy metal ions such as chromium, cadmium, lead, etc. in wastewater. Compared with polyaluminium chloride and polyferric sulfate, polyferric aluminium chloride has a lower ** and will not produce secondary pollution.
In general, it is recommended that inorganic flocculants: polyaluminum chloride (PAC) and organic flocculants: polyacrylamide (PAM) work well in power plant wastewater treatment. If the organic flocculant is used alone, it is necessary to add high concentration to achieve the desired effect, and after the use of polyaluminum chloride (PAC), the ideal sewage treatment effect should also be achieved, and the amount of organic flocculant polyacrylamide (PAM) can be greatly reduced, improve the quality of sewage treatment at the same time, thereby reducing the treatment cost per ton of raw water, and can also avoid the deposition of the cooling tower and other heat exchange surfaces due to the excessive amount of flocculant, resulting in corrosion and scaling of the equipment, and accelerating the aging of the equipment.