Pre Treatment of Recalcitrant Organic Wastewater to Improve Biodegradability (Pyridine Wastewater Treatment)

Pyridine is a six membered heterocyclic compound formed by a nitrogen atom on the benzene ring. It is an important industrial raw material widely used in chemical, pharmaceutical, wood preservation, printing and dyeing, pesticide production, and other industries. It is also an environmental pollutant that is carcinogenic, teratogenic, and mutagenic. The water quality of pyridine wastewater treatment is complex, containing a large amount of heterocyclic non biodegradable substances, with high COD concentration, high organic nitrogen content, and high toxicity. Conventional water treatment technologies are difficult to treat, and the commonly used incineration treatment costs+1000 yuan/ton. The high treatment cost has become an important challenge faced by enterprises. The special adsorption material researched by Haipu Company can selectively separate pyridine and benzene, which are difficult to biodegrade, from pyridine wastewater. The treated pyridine wastewater can be discharged to meet the standard through biochemical treatment.

Process flowchart of pyridine wastewater treatment

Advantages of Pyridine Wastewater Treatment

1. Efficiently remove pyridine and benzene from wastewater, while reducing COD and ammonia nitrogen content, with high removal efficiency. Strictly control the concentration of pyridine and benzene in the treated wastewater, with pyridine and benzene content below 2mg/L;

2. Reduce the cost of wastewater treatment for enterprises. The treatment cost of adsorption method is generally 100-200 yuan/ton, much lower than the cost of incineration treatment+1000 yuan/ton;

3. Recyclable pyridine derivatives in wastewater can improve resource utilization and increase the economic benefits of enterprises.

4. Modular component form, high degree of automation, and simple operation.

Specific cases of pyridine wastewater treatment

A wastewater treatment process design was carried out for a chemical enterprise to treat 240t/d pyridine containing wastewater, solving the problem of high incineration treatment costs for the enterprise's wastewater. This can save the enterprise 74.2 million yuan in wastewater treatment costs in one year.

Table 1 Adsorption inlet and outlet water data

Figure 1 Adsorption influent (left figure), adsorption effluent (right figure)

Figure 2 On site application of adsorption tower

Case 2

Design a pyridine derivative recovery process for 20t/d pyridine derivative wastewater from a certain biochemical enterprise to solve the problem of wastewater resource recovery. It can recover~4t of pyridine derivative products for the enterprise in one year.

Table 2 Data on Adsorption and Removal of Pyridine from Wastewater