Successfully fabricated model of HP2R rotary high-performance reactor

Research team members operate the HP2R equipment system in the laboratory

Treatment of ammonium contaminated wastewater

Urban, industrial and agricultural activities generate large amounts of ammonium released into the environment. In Vietnam, high levels of ammonium were detected in leachate. Large amounts of ammonium require the treatment process to have pretreatment steps because the ammonium concentration threshold that inhibits biological treatment is 200 mg/l.

In Vietnam, there have been many studies aimed at removing ammonium in wastewater, however these studies are only on a pilot scale and are mainly chemical processes. The cost of auxiliary chemicals if processed on a practical scale will be quite high, not including the subsequent sludge treatment. Therefore, the stripping method (wastewater treatment technology using stripping towers) using contact columns, is playing a major role in the ammonium (NH 3 -N) pretreatment stage of the actual wastewater treatment system. However, to achieve high efficiency and meet sufficient capacity, requiring large equipment sizes or extending wastewater circulation time currently causes difficulties in operation and maintenance, as well as investment costs.

Developing technology for manufacturing HP2R equipment

Based on the principles and advantages of the stripping process under high-speed centrifugal acceleration conditions, the research team of Prof. Dr. Trinh Van Tuyen carried out the project: "Research and manufacture of high-performance rotating reactor HP2R (High-performance rotating reactor) to treat wastewater contaminated with high ammonium" with the goal of minimizing ammonium content in water. livestock waste and leachate more effectively.

Process of treating ammonium in wastewater using HP2R equipment (a) and HP2R equipment system (b)

Scientists have successfully manufactured the HP2R rotary high-performance reactor and conducted a survey of factors affecting the stripping process of high concentrations of ammonium in leachate and livestock wastewater (pH = 8.5). ~ 12, temperature 30 o C, rotation speed: 300 - 1200 rpm, wastewater flow from 0.05 - 0.2 L/min and magnetic air flow: 50 - 200 L/min). It has been determined that the efficiency of treating ammonium from livestock wastewater and leachate of the HP2R equipment system with a scale of 1.2 - 12 L/h ranges from 17.1 - 78% when changing operating conditions. The optimal conditions for the ammonium treatment process from livestock wastewater and leachate in a laboratory scale of 1.2 - 12 L/h are rotation speed > 900rpm, Q G / Q L > 1000.

The research team has established a model to predict performance and mass volume transfer coefficient from input parameters of the ammonium stripping process in leachate using HP2R equipment with good regression coefficient (R 2 = 0.87 ~ 0.99). At the same time, scientists have completed the design calculations of the 6,000 L/h HP2R device with a prediction model and economic efficiency assessment when using the HP2R ammonium stripping device in livestock wastewater and garbage leak.

Prof. Dr. Trinh Van Tuyen said: "The HP2R device has the advantages of effectively removing ammonium in wastewater, the physical process does not use auxiliary chemicals, and the device size is compact, minimizing investment costs and improving efficiency." installation capabilities and practical applications. This device can solve existing difficulties in treating high concentrations of ammonium in wastewater in Vietnam. At the same time, it serves as a premise for research on treating vapor pollution indicators in wastewater such as solvent-contaminated circuit board industrial wastewater, eliminating VOCs in groundwater...".

The results of the project were published in 01 international article under the SCIE system, 02 articles in Science and Technology magazine in the Scopus list and accepted by the Council of Vietnam Academy of Science and Technology. Grade A rating.

From the initial successes, the project implementation team in the future will focus on perfecting the technology of the HP2R device, researching technical solutions to recover ammonia from the gas stream after stripping, and evaluating the overall properties of the HP2R device. economic and technical feasibility of the technology, thereby providing comments on the applicability of the HP2R equipment system on a practical scale.

Translated by Quoc Khanh
Link to Vietnamese version