重金属捕捉剂是液体金属沉淀剂，它可以沉淀金属离子的形式有效的使废水中的金属离子浓度降低，重金属捕捉剂是一种与重金属离子强力螯合的化工药剂，因能在常温和很宽的PH值条件范围内，对多种重金属离子进行化学反应。

Here are the steps to use heavy metal trappers:

1、 Before normal use, small-scale experiments can be carried out in the laboratory.

2、 Application method of heavy metal trapper

(1). Dosing method: it can be prepared into a 5%-20% solution, which should be stirred evenly after adding water, and attention should be paid to the dilution of water containing heavy metals in the embryo;

(2). Field use: it can be added in the reaction tank or secondary sedimentation tank process according to the existing treatment process;

(3). Service conditions: the applicable pH range of wastewater is 7-12, and the effect is better when the pH is alkaline 8-10.

3、 Dosing position of heavy metal trapper

In many cases, the dosing position of heavy metal trapper should be determined according to the on-site process of sewage treatment.

Generally, the site is only treated by adding flocculants, and then the effluent is precipitated. This situation is due to the sediment generated after the addition of heavy metal capturing agent.

4、 Precautions for heavy metal trappers

(1). Precautions for safe use of the drug: store in a cool, dry and well ventilated place to avoid exposure to the sun; Avoid stacking with strong acid;

(2). Precautions for the use of small-scale experiment: it is used under alkaline (ph>7), otherwise it is easy to produce hydrogen sulfide; The specific dosage depends on the concentration of heavy metals in the on-site wastewater: the ratio of general dosage to concentration is 10:1, and small-scale experiments can be carried out according to the proportion;

(3). Precautions for field use: the order of chelation strength of various metal ions: hg2+> ag+>cu2+>pb2+>cd2+>zn2+>ni2+, cr3+>fe2+>mn2+; Formula conversion: 1000ppm=1000mg/l=1g/l=1kg/t; Pay attention to anti blocking when adding pipes; Protective measures shall be taken for manual dosing: wear masks and covers;

The above small compilation is about the correct use steps of heavy metal trappers and the matters needing attention when adding.