物化法去除糖蜜酒精废水硫酸盐效果及其产气性能的比较  

Sulfate removal effect of molasses alcohol wastewater pretreated by physical and chemical methods and its biogas production performance

作　　者：任守军[1,2] 孙永明[1] 孔晓英[1] 王瑶[1] 袁振宏[1] 

机构地区：[1]中国科学院广州能源研究所可再生能源国家重点实验室,广州510640 [2]兰州理工大学甘肃省生物质能与太阳能互补供能系统重点实验室,兰州730050

出　　处：《农业工程学报》2016年第5期251-256,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家高新技术研究发展计划(863计划)(2012AA101802);中国科学院重点部署(KGZD-EW-304-1)

摘　　要：糖蜜酒精废水中高浓度的硫酸盐会抑制生化处理产甲烷性能。该文采用活性炭、Ba Cl2·2H2O、Ca(OH)2及铁碳微电池法对糖蜜酒精废水中的硫酸盐进行预处理,并分析了预处理前后硫酸根及化学需氧量COD的变化,同时,也分析评价了几种方法对产气性能的影响。结果表明:在500.0 g糖蜜酒精废水中加入8.0 g活性炭,硫酸根去除率达80.0%以上,且产气性能相对最好,累计产气率可达437.3 m L/g。在500.0 g糖蜜酒精废水中,根据S元素含量和Ba SO4的分子组成比例,添加70%的化学试剂Ba Cl2·2H2O,能全部去除硫酸根,累计产气率可达483.2 m L/g,产气效果相对最好,同等条件下,添加70%的Ca(OH)2,硫酸根也能全部去除,累计产气率可达436.6 m L/g。铁碳微电池处理的糖蜜酒精废水,能有效抑制硫酸根的影响,并且可以提高废水的可生化性,累计产气率为451.0 m L/g,是对照处理293.1 m L/g的1.5倍。各处理效果的产气性能排序为70%Ba Cl2·2H2O>铁碳微电池>8.0 g活性炭吸附>70%Ca(OH)2>对照组。Molasses alcohol wastewater normarlly contains high quantity of SO4 which can restrain the production of the biogas. In this paper, we used the activated carbon, Ba Cl2·2H2O, Ca（OH）2 and iron carbon micro cell to pretreat the molasses alcohol wastewater. Results showed that addition of 8.0 g activated carbon in 500.0 g molasses alcohol wastewater, the sulfate removal rate reached 80% and the gas production was the best which reached 437.3 mL /g. Activated carbon adsorption of sulfate can reach more than 80%, with a small amount of adsorption COD（12%）. Based on the content of S element and Ba SO4 molecules, in the 500 g molasses alcohol wastewater, addition of 70% of BaC l2·2H2O removed all sulfuric acid. The cumulative gas production rate reached 483.2 mL /g. In the same way, addition of 70% of Ca（OH）2 removed all the sulfuric acid, the cumulative gas production rate reached 436.6 mL /g, which is the relatively best. The removal rate of chemical reagents sulfate can reach 100%, and there was no effect on the COD. But the introduction of new ion could have a potential impact on the anaerobic fermentation. Calcium sulfate is slightly soluble in water, so the removal effects of sulfate is not better than that with BaC l2·2H2O pretreatment, though low Ca2＋ concentrations can accelerate the formation of biofilm. Using the Iron carbon micro cell method to handle the molasses alcohol wastewater can effectively suppress the influence of sulfate and improve the wastewater treatment. For daily gas production rate, gas production cycle was shorter in the experimental group than the control group for 2 to 3 d. The first small peak gas production of molasses alcohol wastewater treated with iron-carbon micro-battery appeared in the first 12 d. The cumulative gas production rate with iron carbon micro cell addition can reach 451.0 mL /g which was 1.5 times of the control group. Iron-carbon micro-cell affected sulfate removal by producing iron sulfide and sulfate-reducing product FeS which precipitated in the wa

关 键 词：废水 发酵 沼气 物化法 硫酸根 产气性能 

分 类 号：X703[环境科学与工程—环境工程]