The results obtained from the characterization of the STWW sample used in this study are presented in Table 1. The STWW sample has a basic pH of 8.7 and a high COD and BOD5 of 632.0 and 380 mg L−1, respectively. According to the COD/BOD5 ratio lower than 2, the studied effluent is easily biodegradable (Płuciennik-Koropczuk & Myszograj 2019). However, the COD recorded for our sample is lower than textile wastewater according to the work of Yakamercan & Aygün (2020). Thus, the chloride level in STWW is 14.6 g L−1. The nitrogen value obtained from the STWW showed a value of 48.0 mg L−1. The STWW showed a higher chloride value as compared with a preliminary study conducted Werheni Ammeri et al. (2021). The growth of Ps. putida in the STWW sample was rather difficult.
Physical and chemical characteristics of the secondary wastewater (STWW) sample (data are represented as Means ± SD, n = 3)
| Parameter . | Value . |
|---|---|
| Dry matter, % | 38.0 ± 1.0 |
| pH | 8.7 ± 0.9 |
| Conductivity, mS cm−1 | 1.8 ± 0.1 |
| Organic carbon, % | 2.1 ± 0.1 |
| Nitrogen, mg L−1 | 48.0 ± 1.0 |
| COD, mg L−1 | 632.0 ± 4.0 |
| BOD5, mg L−1 | 380 ± 0.2 |
| Nitrates, mg L−1 | 2.3 ± 0.1 |
| Chlorides, g L−1 | 14.6 ± 0.5 |
| Parameter . | Value . |
|---|---|
| Dry matter, % | 38.0 ± 1.0 |
| pH | 8.7 ± 0.9 |
| Conductivity, mS cm−1 | 1.8 ± 0.1 |
| Organic carbon, % | 2.1 ± 0.1 |
| Nitrogen, mg L−1 | 48.0 ± 1.0 |
| COD, mg L−1 | 632.0 ± 4.0 |
| BOD5, mg L−1 | 380 ± 0.2 |
| Nitrates, mg L−1 | 2.3 ± 0.1 |
| Chlorides, g L−1 | 14.6 ± 0.5 |
COD, chemical oxygen demand; BOD5, biochemical oxygen demand.