Related Experiment Video
Updated: Jun 11, 2026
15:19
Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
In situ sludge reduction assisted by alternating electrode-based electrochemical treatment
Xiaolei Zhang1, Quanze Liu2, Shaoping Luo2
1School of Ecology and Environment, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, PR China.
Bioresource Technology
|June 9, 2026
Summary
This study introduces an in situ sludge reduction technology for wastewater treatment. Electrochemical oxidation combined with pH adjustment effectively disrupts sludge, allowing for recirculation and a self-sustaining system.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment Technology
Background:
- Municipal wastewater treatment generates substantial sludge, creating disposal and management challenges.
- Existing sludge reduction methods often face limitations in efficiency and sustainability.
- Developing in situ technologies is crucial for sustainable wastewater management.
Purpose of the Study:
- To investigate the feasibility of a sustainable in situ sludge reduction technology.
- To optimize electrochemical oxidation parameters for sludge disruption.
- To assess the impact of treated sludge recirculation on sequencing batch reactor (SBR) performance.
Main Methods:
- Utilized a sequencing batch reactor (SBR) for activated sludge processing.
- Applied pH adjustment to dissociate extracellular polymeric substances (EPS).
- Employed electrochemical oxidation with alternating polarity for sludge disruption, using CaCl2 as an electrolyte.
Main Results:
- Achieved approximately 22% sludge disruption using electrochemical oxidation.
- Alternating polarity improved sludge disruption by 25%, mitigating electrode passivation.
- The SBR system maintained self-sustainability with up to 10% sludge recirculation.
Conclusions:
- The proposed in situ sludge reduction technology is feasible and sustainable.
- Electrochemical oxidation, particularly with alternating polarity, is effective for sludge disruption.
- Recirculation of treated sludge shows promise for enhancing wastewater treatment system efficiency.
Related Concept Videos
01:30Biological Treatment of Effluent and Waste Water
Biological wastewater treatment relies on the metabolic activity of microorganisms to remove pollutants from sewage. In modern treatment systems, this process is organized into sequential stages that progressively reduce solid material, dissolved organic matter, and microbial contamination. Each stage plays a distinct role in improving water quality and preparing the effluent for safe discharge or reuse.Primary and Secondary TreatmentPrimary treatment is a physical process that removes large...
01:08Electrodeposition
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:06Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
01:23Microbial Fuel Cells
Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...
01:13Voltammetry: Stripping Methods
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...