Experimental report on the treatment of traditional Chinese medicine wastewater by ozone nano bubble

With the improvement of living standards, people's demand for medical and health services is also increasing, the pharmaceutical industry is also booming, but in the pharmaceutical process will produce a large number of waste residues and wastewater, to the human health life and the natural environment to bring a certain impact.

01Existing problems

Chinese medicine wastewater is mainly difficult to degrade the high concentration of organic wastewater, with a certain degree of biochemistry, and it has a large pigment content, high COD concentration, water quality and quantity of water and organic pollutants and other characteristics of the type of change. Chinese medicine wastewater residue, so that the Chinese medicine wastewater contains some polysaccharides, lignin, tannins, alkaloids, pigments and other components as well as a small number of metal ions, the raw materials of traditional Chinese medicine pharmaceuticals are mainly derived from Chinese herbs, most of which contain natural organic substances, a few contain other complex organic compounds, these raw materials must be used in the process of production of some of the medium material, solvents or excipients, making the water quality components of Chinese medicine wastewater become The composition of Chinese medicine wastewater becomes more complex. Ozone is widely used in wastewater treatment process because of its rapid oxidation reaction, good removal effect and no other by-products, etc., and Zhuhong's nano bubble technology can produce a large number of nano-bubbles, which can greatly increase the contact area between ozone and pollutants and improve the efficiency of ozone utilization, which is a good match for ozone process.

02Experiment purpose

This experiment is to apply nano bubble technology and ozone advanced oxidation technology to the deep treatment of traditional Chinese medicine wastewater to investigate the effect of further reducing COD indicators.

03Experimental equipment, reagents

Zhuhong nano bubble generator (316 stainless steel),
Ozone generator (maximum ozone output 60g/h, ozone concentration 100-140mg/L).
Multi-parameter water quality meter 5B-3B (VII) (measuring COD content), organic glass reaction column,
Dry water pump, connecting fittings (PTFE), etc., 50L of Chinese medicine waste water, tap water, COD detection reagents.

04 Experimental program

Add the Chinese medicine wastewater into the reaction column, the height of the liquid level 107cm, the total volume of wastewater 52.5L. Turn on the equipment to make the solution mix evenly, take the original water samples. Connect the inlet pipe of the nano bubble generator to the ozone generator. Start the ozone generator and nano bubble generator, continuously inject ozone micro nano bubbles into the water body for 1 hour, and take water samples at 15 minutes, 30 minutes, 45 minutes and 60 minutes to test the COD parameters and record.

The original color of the water body is yellowish brown, slightly turbid due to the presence of certain suspended solids. Starting Zhuhong nano bubble generating device to the water body through the ozone gas, the water body quickly filled with a large number of micro-bubbles. As the reaction proceeded, the suspended matter disappeared, the color of the water body basically faded after 6 minutes of operation of the equipment, the water body became clarified, and at the same time observed that the particle size of the bubbles gradually became larger.

COD test results show that the water body in the equipment running for 15 minutes has achieved better treatment results.

05Summary

The COD, chromaticity and turbidity of the wastewater were significantly decreased after the treatment with ozone nano bubble, indicating that the organic pollutants, color-emitting groups and suspended matter in the water were effectively treated.
The chromaticity of the wastewater was basically removed when the equipment was running for 6 minutes, and the COD removal rate reached about 87% when the equipment was running for 15 minutes, with a good comprehensive removal effect and fast rate. Continue to extend the treatment time can improve the removal rate. However, there will be a certain ozone waste, according to the requirements of sewage discharge to choose the appropriate amount of ozone dosage and reaction time.