Scientific research technology

Scientific research technology

Scientific Research Technology

Core technology

Research platform

Research team

Research patent

Core technology

1. Anaerobic technology

MQIC Anaerobic Reactor

The MQIC (Meiquan Internal Circulation) reactor is a next-generation, highly efficient anaerobic reactor—the internal circulation anaerobic reactor.

Wastewater flows upward through the reactor, where pollutants are adsorbed and degraded by bacteria, and the purified water flows out from the top of the reactor.

constitute

The reactor is composed of four distinct functional sections: the mixing zone, the expansion zone, the advanced treatment zone, and the reflux section.

Application

Organic high-concentration wastewater, such as corn starch wastewater, citric acid wastewater, beer wastewater, potato processing wastewater, and alcohol wastewater.

Advantages and Features

1. High volumetric loading, rapid start-up and operation, large biomass of granular sludge, and thorough reaction under fluidized state.

2. Highly resistant to impact, with automatic adjustment of internal gas-lift circulation, achieving thorough dilution through an internal circulation ratio of 10 to 20 times.

3. The two-layer three-phase separator offers excellent effluent stability, combining coarse and fine treatment for high removal efficiency.

4. Reduce energy consumption and operating costs. The biogas internal circulation requires no power consumption, and the circulating water’s pH is buffered, reducing the amount of alkali added.

5. Low infrastructure investment. The high load reduces the reactor volume, and the large height-to-diameter ratio saves space.

6. Generate economic benefits. The byproduct biogas can be used for power generation or combustion, and the granular sludge inoculum can be sold externally.

Bagged Anaerobic Granular Sludge

2. Aerobic Technology

BRN Biological Denitrification Process

Compared with denitrification processes used by other companies, the BRN process has operating costs that are 20% to 50% lower and requires construction investments that are only half to two-thirds of theirs.

Compared with the conventional push-flow A/O biological denitrification process, the segmented influent biological denitrification process (BRN) features a longer sludge retention time (SRT). Consequently, without increasing the mixed liquor suspended solids (MLSS) concentration in the effluent from the reactor, the BRN process leads to an increase in the average sludge concentration within the reactor, while the hydraulic and solid loads on the secondary sedimentation tank remain unchanged.

Due to the use of staged influent feeding, the nitrified liquid produced in each aerobic zone of the system is directly fed into the subsequent anoxic zone for denitrification. This eliminates the need for a nitrified-liquid internal recirculation system. Moreover, in the anoxic zone, the organic matter from the staged influent can be utilized as a carbon source, thus obviating the requirement for external carbon addition.

Comparison between the A/O Process and the BRN Process

Comparison dimension

A/O process

BRN process

Impact resistance

Weak

Strong

External carbon source

Need

Not needed

Added alkalinity

Need

Necessary when needed

Water output effect

Once the concentration of wastewater drops to a certain level, it becomes difficult to treat further.

The system contains microbial strains that are adaptable to a variety of concentrations and can treat wastewater at different concentration levels accordingly.

Ease of operation

Not easy to operate

Easy to operate

AMOXP biological denitrification

The AMOXP biological denitrification process is a proprietary technology developed by Shandong Meiquan Environmental Protection specifically for high-concentration ammonia-nitrogen wastewater. It is currently the world’s most advanced denitrification process.

Application

Suitable for wastewater with high ammonia nitrogen and an imbalanced carbon-to-nitrogen ratio, it can effectively remove nitrogen and reduce energy consumption by more than 60%.

Advantage

Comparison dimension

Traditional denitrification process

AMOXP Biological Denitrification

Ammonia Nitrogen Treatment Capacity

Low

High: Suitable for aerobic treatment systems with influent ammonia nitrogen levels ranging from 400 to 1,500 mg/L, achieving effluent ammonia nitrogen concentrations as low as less than 5 mg/L.

Total nitrogen removal rate

Low

High: Not limited by the internal reflux of conventional A/O processes, nor constrained by carbon sources in wastewater, achieving a removal rate of over 90%.

Investment cost and operating expenses

High

Low: Only about half of the ammonia nitrogen in the influent is oxidized, and the oxidation process stops at nitrite. This can reduce energy consumption by more than 60%, eliminating the need for external carbon sources or alkaline chemicals. Sludge production is also reduced by approximately 70%.

Residual sludge production

Big

small

Process

1. Washing Unit: The alkaline biological scrubbing liquid is sprayed from the top of the washing tower and comes into countercurrent contact with the biogas source containing sulfur compounds that enters from the bottom of the tower. This process efficiently absorbs H2S. After a washing duration ranging from tens of seconds to several dozen seconds, the H2S removal rate in the biogas reaches over 98%.

2. Microbial Regeneration Unit: The sulfide-rich liquid containing sulfides flows from the bottom of the scrubbing tower into the regeneration reactor, where it undergoes biological metabolism by desulfurization microorganisms, converting sulfur compounds into elemental sulfur while simultaneously causing the solution’s pH to rise.

3. Degassing Unit: The regenerated washing liquid enters the degassing tank to remove any air entrained in the liquid. It is then pumped back into the scrubbing tower for repeated use, thereby preventing air from entering the scrubbing tower and mixing with the biogas.

4. Elemental Sulfur Separation Unit: Elemental sulfur is separated from the sulfur precipitator in the form of particulate sedimentation and enters a sulfur storage tank for temporary storage. After being subjected to pressure filtration, the elemental sulfur is separated out, while the clarified liquid resulting from the separation is returned to the biological regeneration reactor.