Stone Processing Plant Wastewater Treatment and Equipment Selection

Stone processing is an important non-metallic mineral industry that generates wastewater containing various components during production. This wastewater needs to be properly treated to meet environmental protection standards.

Wastewater Components

The main components contained in the wastewater of stone processing plants include:

• Stone Powder: Components include SiO2, CaO, and CaCO3, etc.

• Petroleum Hydrocarbons: From mechanical lubricants.

• Surface Dispersing Agents: Used in the stone processing process.

• Inorganic Salt Additives: Such as ammonium chloride, sodium nitrite, etc.

• Diamond Particles: From abrasives.

• Rinsing Silt: From the rinsing process of stone.

Wastewater Treatment Methods

Infrastructure

• Prepare a concrete floor to install wastewater treatment equipment.

• Check pipeline connections to ensure no leaks.

• Connect the control cabinet to the water pump and power source.

Startup and Operation

• Pump sewage into the equipment and start aeration.

• Regular maintenance, especially for easily damaged parts such as fans and water pumps.

Treatment Processes

1. Coagulation Upflow Sedimentation: Suitable for medium to large enterprises.

2. Coagulation Flat Flow Sedimentation: Suitable for small businesses.

3. Sewage Sludge Dewatering: Using horizontal spiral centrifugal sedimentation.

Equipment Selection

• Choose the appropriate wastewater treatment equipment and technology according to the scale of the enterprise and the characteristics of the wastewater.

• Consider the operating cost, maintenance requirements, and treatment effect of the equipment.

Wastewater Treatment Processes

1. Coagulation-Biological Contact Oxidation:

   • Remove organic pollutants and ammonia nitrogen.

   • Use charcoal as filler to improve treatment efficiency.

2. AB Method:

   • Adsorption tank → Intermediate sedimentation tank → Aeration tank → Secondary sedimentation tank.

   • Low construction cost, sludge is not easy to expand.

3. A-A-O:

   • Good nitrogen and phosphorus removal capabilities.

   • Improve sludge settling performance.

4. CASS:

   • Ideal plug flow process increases the driving force of biochemical reactions.

   • Stable operation effect.

5. Oxidation Ditch:

   • Simple treatment process, low construction cost.

   • Capable of resisting impact load.

6. MBR (Membrane Bioreactor):

   • Membrane filtration replaces traditional sedimentation processes.

   • Good water quality, less residual sludge.

Conclusion

Stone processing plants should choose the appropriate wastewater treatment equipment and technology to ensure that the water quality after treatment meets national standards, while considering economy and operability. Proper wastewater treatment not only helps protect the environment but also meets the requirements of sustainable development.