DF-775 是一种无机阳离子混凝剂的水溶液。它可有效增加工业废水处理中通常产生的金属化合物沉淀物的粒径。
建议将 DF-775 用作废水的处理化学品，其中金属已被氢氧化物、硫化物、二硫代氨基甲酸盐（DF-610、DF-640 和 DF-650）、硫酸亚铁或硼氢化钠沉淀。
该产品可与阴离子聚合物结合使用，以进一步提高沉降速率。它非常适用于使用重力澄清或膜微滤的连续流动工艺，以及在浓缩物的批量处理中增强沉降和过滤。
应用
根据具体应用，DF-775 实现快速沉降和极佳液体透明度的最佳浓度由广口瓶测试确定。各种废水污染物的浓度，例如悬浮固体、总溶解固体、COD、BOD 以及油和油脂，都对 DF-775 的最佳用量有影响。DF-775 在很宽的 pH 范围内（4.0 到 11.0）都有效。
DF-775 的添加由体积进料控制，与废水进料速率成正比。DF-775 可以在金属沉淀步骤之前、之中或之后添加。最佳添加位置取决于废物成分和可用于进行沉淀的设备。
在重力沉降系统中使用时，DF-775 通常与高分子量阴离子聚合物结合使用，后者在 DF-775 之后添加到后面的反应罐中。
建议通过实验室评估来确定使用 DF-775 的最佳条件。DFLOW LLC 将提供现场技术支持以协助可处理性研究。
DF-775 案例研究
案例研究#1
一块在新罕布什尔州纳舒厄制造的印刷电路板在使用澄清剂时遇到了困难，因为悬浮固体的快速积累超出了电路制造商的能力。该公司考虑安装更大的压力机或单独的污泥储存罐。
通过将铝基混凝剂转换为 DF-775，该公司能够实现卓越的流出物透明度，同时将其固体生成量减少近 50%。减少固体的产生：
- 改进了澄清器的性能
- 减少运输的危险废物数量，以及
- 提高污泥中铜的浓度，从而提高其循环利用价值
案例研究#2
同样位于新罕布什尔州纳舒厄的第二家电路板制造商拥有用于废水处理的错流微滤系统。去除固体对于保持过滤器的吞吐量至关重要。
每平方英尺膜每分钟加仑的吞吐量被称为“通量”。当系统开始备份固体时，该通量将降低，从而降低操作员跟上产生的废水的能力。
通过将铝基凝固剂转换为 DF-775，电路板制造商将所需的固体压制次数从每天一次压力机负载减少到每三天一次压力机负载。在此过程中，该公司减少了危险废物的产生，提高了废物中铜的回收浓度，并改善了系统的运行。
好处
- 快速沉降和极好的液体透明度
- 在很宽的 pH 范围内（4.0 到 11.0
- 在沉淀金属被氢氧化物、硫化物、二硫代氨基甲酸盐、硫酸亚铁或硼氢化钠踩踏时非常有效
- 与阴离子聚合物结合使用时可增强沉淀
物理数据（典型）
外观：透明液体
比重：1.09
密度：9.14 lbs/gal
pH：1.5-2.5
水中溶解度：完全
冰点：-13°F
闪点：不适用
稳定性：在正常条件下稳定
DF-775 is an aqueous solution of inorganic cationic coagulant. It is effective for increasing the particle size of precipitated of metal compounds typically produced in industrial waste water treatment.
DF-775 is recommended as a treatment chemical for effluents, where the metals have been precipitated by hydroxide, sulfide, dithiocarbamates (DF-610, DF-640, and DF- 650), ferrous sulfate, or sodium borohydride.
The product can be used in combination with an anionic polymer to further enhance settling rates. It is excellent for use in continuous flowing processes which use gravity clarification or membrane microfiltration as well as to enhance settling and filtration in batch treatment of concentrates.
Applications
Depending on the specific application, the optimum concentration of DF-775 to achieve rapid settling and superb liquid clarity, is determined by jar testing. The concentration of the various wastewater contaminants, such as, suspended solids, total dissolved solids, COD, BOD, and oil and grease, all have an impact on the optimum DF-775 dosage. DF-775 is effective over a wide pH range (4.0 to 11.0).
Addition of DF-775 is controlled by volumetric feed, proportional to the wastewater feed rate. DF-775 can be added prior to, during, or after the metal precipitation step. The optimum addition location is a function of the waste composition and the equipment available to perform the precipitation.
When used in a gravity settling system, DF-775 is usually used in combination with a high molecular weight anionic polymer, which is added in a later reaction tank after the DF-775.
Laboratory evaluation is recommended to determine the optimum conditions for use of the DF-775. Dflow LLC will provide onsite technical support to assist with the treatability study.
DF-775 Case Studies
Case Study #1
A printed circuit board manufactured in Nashua, New Hampshire was having difficulty with its clarifier due to the rapid accumulation of suspended solids beyond the circuit maker's ability to press them off. The company considered the installation of a bigger press or a separate sludge storage tank.
By converting to DF-775 from an aluminum based coagulant, the company was able to achieve superior effluent clarity while reducing their solids generation by almost 50%. Reducing the generation of solids:
- Improved the performance of the clarifier
- Reduced the amount of hazardous waste shipped, and
- Increased the concentration of copper in the sludge and thus its recycle value
Case Study #2
A second circuit board manufacturer, also located in Nashua, New Hampshire, has a crossflow microfiltration system for wastewater treatment. Removal of solids is critical to maintaining the throughput of the filter.
The throughput in gallons per minute per square foot of membrane is referred to "flux". When the system starts to back up solids, this flux will decrease, reducing the operator's ability to keep up with the wastewater generated.
By converting to DF-775 from an aluminum-based coagulant, the circuit board manufacturer reduced the the number of solids pressings required from one press load per day to one press load every three days. In the process, the company reduced its hazardous waste generation, increased the concentration of copper in the waste for recycling, and improved the operation of their system.
Benefits
- Rapid settling and superb liquid clarity
- Effective over a wide pH range (4.0 to 11.0
- Highly effective where precipitated metals have been treaded by hydroxide, sulfide, dithiocarbamates, ferrous sulfate, or sodium borohydride
- Enhances precipitation when used in combination with an anionic polymer
Physical Data (Typical)
Appearance: Clear liquid
Specific gravity: 1.09
Density: 9.14 lbs/gal
pH: 1.5-2.5
Solubility in water: Complete
Freeze point: -13°F
Flash point: Not applicable
Stability: Stable under normal conditions
