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| | For more than five years, a small-sized wood-based paper mill has been operating its chemical recovery and effluent discharge systems with satisfactory results. Major mill experiences are summarized as follows:1. With a three stage screw press system, black liquor extraction averages 85.5%.2. 65-70% chemical recovery is being claimed with a recovery system composed by 4 stage eva-perators, a simplified recovery furnace, a causticizing unit and a vacuum plate filter.3. Low capital investment is claimed and r... | | 小型木材制浆造纸厂采用黑液提取、碱回收及废水综合处理的工艺技术,能有效回收化学品和控制对生态环境的污染。本厂采用上述工艺技术,历经五年的生产实践,其情况说明: (1)用三段螺旋挤浆,黑液提取率平均可达85.5%; (2)用四效蒸发、简易燃烧炉,苛化、真空叶片吸滤工艺技术,碱回收丰可望达到65~70%; (3)整套碱回收系统投资较省,基建投资费用可在兰年内收回; (4)燃烧炉操作管理容易、安全、可靠,使用周期较长,一般8年大修一次; (5)经碱回收后,洗浆废水污染负荷下降85~90%,有利于进一步作厂外处理。本厂采用从废水回收流失纤维,凝聚、絮凝,水生植物氧化塘的工艺技术,能将废水悬浮物去除95%,COD_(cr)去除80~85%,BOD_5去除80~90%,确保排水有较高的质量指标。 | | 文摘来源 | | The five important problems were reached in common in “The Seminar of Phosphate Application Technology”,that is :the sodium tripolyphosphate is still the idealest builder in synthetic detergent;the eutrofication in water system is because of the aquatile chain,and has no direct relation with phosphate content in water;it is unefficient for the environment protection only by inhibiting and restricting phosphate in detergent.the phosphate detergent and non phosphate detergent is no distinct difference for the... | | 在“磷酸盐应用技术研讨会”上达到共识的五大重要问题———三聚磷酸钠是最理想的合成洗涤剂助剂;水体富营养化是由水生食物链破坏所致,与水中的含磷量无直接关系;单一实施洗涤剂限磷、禁磷,对环境保护无效果;用生命周期分析,含磷洗涤剂和无磷洗涤剂对环境影响无明显差别;建设废水处理系统,是解决水质富营养化问题的根本办法。并在此基础上作出了含磷洗涤剂仍是我国近期洗涤剂的主要品种的预测,提出当前应做的工作是:正确舆论导向;我国洗涤剂限、禁磷政策的制订必须切合国情,因地制宜,不能一刀切;加强科学研究,大力推出洗涤效果好和环境效果好的洗涤用品;加速城市生活废水的综合处理等。 | | 文摘来源 | | As the reason of both the ion components' complexity and the higher content of various ion,not only will a single water treatment method be confined,but the section of the water treatment has need to bear higher expenses of the engineering operation in the purification of the higher sulphate mine water.In the opinion of the comprehensive industrialization of the waste water treatment and the rule of the solubility product,the method using the barium reagent has been proved to be feasible in the purificatio... | | 由于高硫酸盐矿井水离子组分复杂且含量高,使单一的水处理技术应用受到很大的限制,同时也使水处理部门承受昂贵的运行费及设备维护费。本文从废水综合处理产业化角度出发,依据无机化学反应中的溶度积规则,利用钡试剂净化高硫酸盐矿井水,在达到净化目标的同时,又能回收具有较高经济价值的沉淀性BaSO4,从而反向支持水处理工程的运行,使一个单一的矿井水处理项目变成一个具有商品水、商品沉淀性BaSO4 收益的综合产业部门。 | | 文摘来源 | |   | | << 更多相关文摘 |
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