This is the most economical and effective way to prevent clogging of drip irrigation pipe. The stricter the pretreatment, the less physical clogging will occur. According to the water quality and flow rate, three trash racks are made of wire mesh at the water intake of the pump. The number of trash racks installed ranges from 10 to 50 meshes, to block suspended mud, sand and debris. Or the river water is introduced into the reservoir, after sedimentation, and then covered to avoid light to prevent the entry of debris and algae reproduction.
According to the pre-treated water quality, the first part should be installed with sand and gravel filters, laminated filters, screen filters or combined for filtering treatment. The water quality can generally meet the standard of drip irrigation water. For example, a small flow screen filter is installed after the shed head valve for secondary filtration treatment, which can greatly improve the safety performance of the drip tape irrigation system against clogging. When the drip irrigation pipe is installed in the field, the drip hole on the drip line pipe faces upwards, which can make a small amount of impurities in the water settle on the bottom of the pipe and prevent the root system from invading the drip irrigation hole.
Firstly, use soluble fertilizer, and the fertilizer must be installed before the filter. Secondly, the drip tape irrigation system can only be fertilized when the filter equipment is normal. After fertilization, the system should be rinsed with clean water for about 15-30 minutes to prevent the remaining fertilizer in the pipeline from settling.
When the newly installed drip irrigation pipe is used for the first time, the plug at the end of the drip irrigation pipe should be opened, and water should be fully drained to rinse. After the impurities in the pipe are rinsed out, the drip irrigation pipe should be rinsed again after 5 times. Before irrigation, check the filter frequently, turn on the filter backwashing device to decontaminate, and remove impurities accumulated on the filter screen in time to prevent the filter from clogging. If the filter screen is damaged, it should be replaced in time.
If fertilizer and other chemical clogging occur in drip irrigation, acid cleaning can be carried out if necessary, which can simultaneously achieve the effect of disinfection, inhibition and elimination of algae and microorganisms in the water. Acids such as perchloric acid, nitric acid, sulfuric acid, etc. are commonly used, adjust the pH value to 5.5-6.0 during use, and strictly control the use concentration during treatment to avoid harm to crops. Pay attention to lowering the irrigation pressure of the drip tape irrigation system during acid cleaning to slow down the flow rate and improve the pickling effect. After that, rinse with clean water. This method is easy to cause soil acidification, it is recommended to use it with caution!