造纸废水灌溉对芦苇不同生长期土壤中氯离子的影响

Influence of Papermaking Wastewater Irrigation on Soil Chloride Ions Under Different Growth Period of Reed

构建小试装置模拟盘锦双台河口天然湿地,用CODCr浓度为50,175,300mg/L的造纸废水进行灌溉,研究造纸废水灌溉对土壤氯离子含量的影响。结果表明,在3种浓度造纸废水灌溉下,浓度为50,175mg/L废水处理下土壤中氯离子的含量均有明显的下降;300mg/L废水对氯离子的去除效果较差,土壤中氯离子含量有增加的趋势,这说明高浓度的造纸废水不适于灌溉盐碱化芦苇湿地,浓度为50,175mg/L废水较适合灌溉盐碱化芦苇湿地。10-40cm土层氯离子的去除量相对于其他土层较好,芦苇发达的根系有助于吸收氯离子。经双因素方差分析和多重比较,在拔节期灌溉浓度为50mg/L造纸废水后土壤中氯离子含量变化量最大,为-3.19cmol/kg,即土壤中氯离子相对初始值减少3.19cmol/kg;芦苇发芽期和成熟期对氯离子的需求最小,土壤中氯离子含量较多。

Based on constructing the small scale device, effects of papermaking wastewater irrigation on soil chloride ion content was analyzed after irrigation three concentration of wastewater （50, 175, 300 mg/L）. The results showed that the chloride ion content in soil significantly decreased under the concentration of 50, 175 mg/L of wastewater treatment. The chloride ion removal effect was less under the concentration of 300 mg/L of wastewater treatment and chloride ions in the soil had increasing trend. It indicated that a high con- centration of papermaking wastewater was unsuitable for irrigation saline-alkaline of reed, while the concen- tration of 50, 175 mg/L of wastewater was more suitable for irrigation the reed wetlands. The amount of re- moval rate of chloride ion in 10--40 cm soil layer was better than that in other soil layers. The developed roots of reed helped absorb chloride ions. By the two-factor variance analysis and multiple comparisons, the variable quantity of chloride ion content in soil was maximum （--3.19 cmol/kg） after irrigation the concen- tration of 50 mg/L wastewater in the jointing stage. It indicated that the chloride ion in the soil reduced by 3.19 cmol/kg compared with initial value. Reed required a few chloride ions in germination and maturity, so chloride ion content in the soil was more