Five commonly used industrial wastewater treatment technologies
Constructed Wetland Technology
Constructed wetlands primarily remove nitrogen through microbial nitrification and denitrification, while phosphorus removal occurs primarily through adsorption and sedimentation mineralization within the wetland filler. Plants with long, well-developed root systems, such as the currently popular reed, are particularly effective at nitrogen removal because their roots create a favorable anaerobic-anoxic-aerobic environment.
This system can operate stably in constructed wetlands under a hydraulic load of 24.6 cm/day.
Features
This process offers simple operation and management, easy maintenance, and strong adaptability to load fluctuations. However, it requires a large footprint and is subject to climatic constraints during wastewater treatment. It is also prone to siltation and congestion.
Adsorption Regeneration (Contact Stabilization) Method
This method fully utilizes the initial removal capacity of activated sludge, removing suspended and colloidal organic matter from wastewater through adsorption in a relatively short period of time (10-40 minutes). Liquid-solid separation then purifies the wastewater.
Features
This process has strong adaptability to load shocks and can eliminate the need for a primary sedimentation tank. It is suitable for treating wastewater containing high levels of suspended and colloidal matter, such as tanning wastewater and coking wastewater.
Membrane Bioreactor
A membrane bioreactor is a wastewater treatment system that integrates activated sludge and membrane separation technologies.
Features
This process eliminates the need for a secondary sedimentation tank, centralizes process equipment, and enables automated control with existing technology.
However, the high cost of membrane modules increases project investment by approximately 30%-50% compared to conventional treatment methods. Furthermore, the membranes have a short lifespan and require regular replacement, resulting in high operating costs.
Biological Nitrogen and Phosphorus Removal (A/A/O) Process
Biological nitrogen and phosphorus removal refers to a process that uses biological treatment to remove the nutrients nitrogen and phosphorus from wastewater.
Features
The organic combination of three different environmental conditions—anaerobic, anoxic, and aerobic—and different microbial flora simultaneously removes organic matter and denitrifies and removes phosphorus.
Adding Chemicals
Many industrial wastewater contains a large amount of persistent substances that cannot be effectively removed by single-use water treatment equipment. Therefore, appropriate wastewater treatment chemicals are often added based on the specific characteristics of the wastewater to ensure that the treated wastewater meets national emission standards.
Cijie's environmentally friendly chemicals, such as ammonia nitrogen removers, phosphorus removal flocculants, and heavy metal scavengers, offer advantages in addressing heavy metal contamination, effluent color, and water quality in industrial wastewater, without interfering with existing treatment processes.
Features
Wastewater treatment chemicals assist in the stable operation of wastewater treatment equipment, enhancing its treatment effectiveness. Engineers will calculate the appropriate dosage based on the actual conditions of the wastewater treatment site to ensure that the wastewater meets discharge standards.