3 Cases of Daily Chemical Wastewater Treatment: Will Their Methods Be the Same?

3 Cases of Daily Chemical Wastewater Treatment
Daily chemical wastewater is the industrial wastewater discharged from the production of daily chemical products (laundry detergent, toothpaste, cosmetics, etc.), and most of the production of daily chemical products is concentrated in the Pearl River Delta region.

The three daily chemical wastewater treatment cases introduced are also derived from this. Two are in Guangzhou and one is in Foshan. There are renovation projects and new projects. Will their treatment methods be the same?

Detergent production, pictures from the Internet

There are many types of daily chemical products. In fact, these three categories are also different. Some are mainly cleaning products, and some are mainly cosmetics. This leads to different wastewater discharges, but it is inseparable from one pollutant - LAS (anionic surfactant), which is also the main component of daily chemical products.

①In a cosmetic wastewater treatment project in Guangzhou, the wastewater volume is 100m3/d, which are cosmetic production wastewater, cleaning product production wastewater and equipment washing wastewater. Some of the wastewater has a COD concentration of 11,000 mg/L and contains a large amount of pollutants, with poor biodegradability.

②In the wastewater treatment project of a daily chemical product in Guangzhou, the amount of wastewater is 40m3/d, mainly including the production wastewater of hairdressing products, the production wastewater of hair care products and the wastewater of equipment washing. The fluctuation of water quantity and water quality is very large, which has a great impact on the impact of biochemical treatment, which cannot be directly entered into biochemical treatment.

③In the waste water treatment project of Foshan washing and care products, the waste water volume is 120m3/d, which belongs to the renovation project. There are many bubbles in the biochemical system and the sludge is yellow, which is quite high, resulting in the effluent not meeting the standard.

The common method for daily chemical wastewater treatment is coagulation sedimentation + biochemical treatment + advanced treatment. If you like it, you can like, follow, and collect.
The three cases are handled in basically the same way, with some adjustments to the specific details.

Among them, coagulation and sedimentation are very important, and the treatment efficiency of COD and chroma is very high, and it can also solve the problem of LAS.

Its principle is that by adding PAC and PAM and stirring, the PAC and PAM can be quickly and evenly diffused into all the water to create good polymerization conditions, and the particles are coagulated by Brownian motion and turbulent water flow to form fine alum flowers. Larger particles or flocs are formed due to agglomeration or aggregation and overlapping due to collision with each other, so that the pollutants are easier to sink naturally and be removed.

Biochemical treatment includes hydrolytic acidification + multi-stage contact oxidation. Hydrolytic acidification is the main task of COD removal. The effluent COD concentration is below 2000mg/L, and then enters into aerobic biological treatment to further remove organic matter, and the secondary sedimentation tank The effluent COD concentration is lower than 60mg/L, which meets the discharge requirements.

The hydrolysis acidification method is to intercept the insoluble organic matter in the daily chemical wastewater and gradually convert it into dissolved organic matter, and some difficult-to-biodegrade macromolecular substances are converted into easily degradable small molecular substances such as organic acids, etc. The biodegradability and degradation rate of wastewater are greatly improved to facilitate subsequent aerobic biological treatment.