水丝蚓捕食污泥影响因素及其特性

Influencing factors and characteristics of tubificid worms for excess sludge reduction

摘要:

为解析水生寡毛纲颤蚓科水丝蚓的生长特性和污泥捕食效能,围绕pH、温度、载体厚度和光照4个污泥捕食过程的主要环境因子,以水丝蚓的生长、呼吸速率和捕食污泥效率等为评估指标开展研究．结果表明：水丝蚓适宜生存的pH范围为4～8,对污水污泥中的pH变化具有较强的适应能力;在25 ℃下呼吸速率最高,表现出较高的生物活性;适合水丝蚓稳定附着和高效捕食污泥的载体厚度为1 cm,游离水丝蚓比例为3.8 ％;自然光照不会对水丝蚓捕食污泥存在较大干扰,而强光的刺激会引起其遁逃和藏匿行为;污泥减量效率可达27％ 以上．

Abstract:

To analyze the growth characteristics and predation potential of tubificid worms as the predator for excess sludge, the variations in the growth, respiratory rate and sludge reduction efficiency of such worms under different pH value, temperature, carrier thickness and light intensity were investigated. The results showed that the worms could live in a pH range from 4 to 8, and therefore might have adaptability to the pH change in practical sewage sludge. The respiratory rate of worms reached the maximum at 25 ℃, indicating the higher biological activity at this temperature. The worm immobilization and performance for sludge reduction were improved by the carrier with 1 cm of thickness, where only 3.8％ of the total worms left. Natural light had no significant effect on the sludge predation by worms. But strong light was not recommended by which the escape and hiding behavior of worms had been caused. The optimal sludge reduction efficiency was above 27％.