The Integration Method of Micro-Electrolysis Technology and Membrane Bioreactor

In this kind of marine sewage treatment processor, the micro-electrolysis technology is usually used as a pretreatment step. The sewage first enters the micro-electrolysis reaction zone, where it undergoes preliminary treatment through the action of iron-carbon fillers. During the micro-electrolysis process, the organic substances in the sewage are partially degraded, and heavy metal ions are removed or their concentrations are reduced through reactions such as displacement and coprecipitation. Meanwhile, the molecular structures of some refractory organic substances are changed, making them more amenable to subsequent biological treatment.

The sewage that has undergone micro-electrolysis pretreatment then enters the membrane bioreactor section. In the membrane bioreactor, microorganisms further decompose the organic substances in the sewage under the condition of aeration. The membrane module effectively retains the microorganisms and incompletely treated pollutants, achieving efficient solid-liquid separation and ensuring the quality of the effluent water.

Advantages of the Integrated Equipment

(1) Strengthening the Treatment Effect

More Thorough Removal of Organic Substances

The decomposition effect of micro-electrolysis technology on macromolecular organic substances provides more easily utilizable substrates for the microorganisms in the membrane bioreactor, improving the degradation efficiency of microorganisms on organic substances. After the combination of the two, the total removal rate of organic substances in the sewage can reach more than 90%, greatly reducing the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of the sewage, making the effluent water more capable of meeting strict emission standards.

Enhanced Removal of Heavy Metals

The ability of micro-electrolysis technology to remove heavy metals plays a role in the pretreatment stage, reducing the toxic impact of heavy metals on the microorganisms in the subsequent membrane bioreactor, and further reducing the content of heavy metals in the effluent water, ensuring the environmental safety of the treated water.

(2) Improving Equipment Stability

Alleviating Membrane Pollution

The micro-electrolysis pretreatment can remove some substances that may cause membrane pollution, such as macromolecular organic substances and colloidal substances. In this way, the degree of membrane pollution in the membrane bioreactor is reduced, the service life of the membrane is extended, and the maintenance cost and operation risk of the equipment are decreased.

Stabilizing the Biological Treatment Process

Substances such as ferrous ions produced during the micro-electrolysis process have a certain promoting effect on the metabolic activities of microorganisms, helping to maintain the stability and activity of the microorganism community in the membrane bioreactor, making the biological treatment process more stable and reliable.

(3) Saving Space and Cost

Compact Equipment Design

Integrating the micro-electrolysis and membrane bioreactor into one equipment makes full use of the synergistic effect of the two, reduces the floor area of the equipment, and is more suitable for use in places with limited space such as ships.

Reducing Operating Costs

Although both the micro-electrolysis technology and the membrane bioreactor have their own operating costs, after the combination, due to the improvement of the treatment effect, the need for subsequent in-depth treatment is reduced, and the overall comprehensive cost of sewage treatment is decreased. For example, the usage amount of chemicals and energy consumption may be reduced.

This marine domestic sewage treatment equipment that combines the principles of micro-electrolysis technology and membrane bioreactor provides an efficient and reliable solution for ship sewage treatment, helping to protect the marine environment and realize the sustainable use of water resources.