Effects of phenol in petrochemical wastewater on the growth of water hyacinth
1988
Wu Zhenbin | Xia Yizheng | Qiu Changqiang (Academia Sinica, Wuhan (China). Inst. of Hydrobiology)
A semi-dynamic phenol toxicologic simulation test has been conducted. Results showed that when phenol concentration (cp) in water was above 600 mg/l, the hyacinths died in a few days; when cp was higher than 40 mg/l, the growth of hyacinths slowed down to various extents, with leaves and roots partially or totally damaged and the chlorophyll content, chl. a/b ratio, photosynthesis speed and growth rate all decreased successively as cp was rising. Intense sun-light aggravated the toxic effect of phenol on the plant. Phenol with concentrations lower than 25 mg/l had little inhibitory effect on the hyacinths, and with cp lower than 10 mg/l, it could actually promote the growth of the plant. It was found that phenol at lower concentration could inhibit asexual reproduction but could promote earlier blooming of the hyacinths.
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