Daily operation specification for circulating water treatment and dosing

Circulating water system ◆◆◆Water treatment dosing staff daily work rules 1. Dosing personnel operating procedures>>>>1. Principles of dosing (1) Dosing accurately, on time, and according to the amount; (2) When intermittent sewage discharge is used, dosing should be done after sewage discharge; (3) Before dispensing, the dispensing barrel must be rinsed clean , the medicine can be poured into the dispensing barrel, and the medicine dispensing barrel needs to be rinsed 2~3 times after adding the medicine; (4) If two kinds of bactericidal algicides are used, they should be added alternately, and the time interval between additions should be evenly distributed; (5) Do not add scale and corrosion inhibitors on the day when the bactericide and algicide are added; (6) Record the daily dosing and sewage replacement in detail.>>>>2. Dosing method According to the current situation of the system and the characteristics of the medicine, the bactericidal algaecide can be directly added to the sump. The dosing method of scale and corrosion inhibitors is as follows: a dispensing tank is arranged next to the circulating cooling water collection pool. The upper part of the dispensing tank has a water supply pipe and the lower part has a sewage outlet. Evenly and gradually add to the sump (see Figure 1):>>>>3. Dosing position Do not add the medicine to the sump near the drain, so as not to drain the medicine without entering the circulating water system; the medicine must have a mixing time in the pool to make it evenly mixed; do not approach a certain pump Dosing at the inlet, which will cause uneven distribution of drug concentration.>>>>4. Dosing method (1) Adding method of scale and corrosion inhibitor: Add the medicine according to the amount into the cleaned dispensing barrel, add supplementary water under constant stirring to dilute the medicine by about 3 to 5 times (the purpose of dilution is to In order to balance the dosing time, it may not be diluted if necessary), after stirring and mixing, turn on the dosing pump to adjust the dosing valve, so that the medicine is continuously and evenly added to the sump, and the addition is controlled within 20 to 24 hours. (2) Adding method of bactericide and algicide: the operation is carried out by the impact intermittent dosing method, and the agent is directly added to the sump according to the amount, so that the circulating water maintains a considerable concentration of the agent for a period of time, so as to obtain the most effective biocidal and peeling effects.>>>>5. Precautions (1) Neatly stack the water treatment chemicals in the warehouse according to the grades to avoid confusion and misuse. (2) According to the water quality test results (concentration ratio, turbidity, total phosphorus) and the circulating water control indicators and dosing table, it is necessary to perform sewage discharge, replacement or dosing operations as required. (3) Dosing personnel should wear protective equipment during operation to avoid direct contact between the medicine and the skin and eyes. If the medicine comes into contact with the skin accidentally, rinse it off with plenty of water immediately. (4) The method of adding water treatment chemicals must be strictly implemented in accordance with relevant requirements, and safety production work must be done well. 2. Operation control of circulating cooling water 1. According to the daily water quality analysis and test results, carry out necessary control on the amount of sewage, supplementary water and dosing to make it meet the required indicators. 2. When the turbidity> 20 mg/L, increase the amount of sewage, increase the flow rate of the side filter, and replenish clean water until the turbidity of the circulating water is < 20 mg/L. 3. According to the current situation of the system, the concentration ratio should be increased as much as possible to save water and medicine. If the concentration ratio is> 4 times, increase the amount of sewage, add clean water, and replace until the concentration ratio is < 4 times. 4. Total phosphorus control in circulating cooling water. According to the chemical properties of scale and corrosion inhibitors, it is advisable to control the total phosphorus in the circulating cooling water within the range of 6-10mg/L. (1) Due to the large amount of sewage, the total phosphorus is low, so scale and corrosion inhibitors should be added appropriately to make the total phosphorus reach the required index, and the amount of sewage should be adjusted. (2) If the circulating water system discharges sewage normally, but the total phosphorus is low, it is necessary to analyze and check whether the medicine is invalid or the deviation is too large. If the above reasons are excluded, increase the dosing amount so that the total phosphorus reaches the target requirement. (3) If the total phosphorus in the circulating water is greater than 10mg/L, no scale and corrosion inhibitor will be added. 5. When abnormal phenomena and problems in the operation of the circulating cooling water system and water treatment work are found, it is necessary to report and deal with the relevant personnel in time, and make a record. 3. Circulating cooling water index control range Note: The concentration multiple is approximately equal to the ratio of Cl- mass concentration in circulating water to replenishing water. 4. In the chemical addition treatment of circulating water, the circulating water should be listed to detect the corrosion of the metal to ensure the safety of the heat exchange equipment, strictly control the acid and alkalinity of the circulating water to avoid corrosion of the equipment.