In order to achieve this goal, the effluent quality of the clarifier and filter is as follows:
(1) The clarifier effluent turbidity is less than 1FTU, preferably less than 0.5FTU
(2) The effluent turbidity of the filter is less than 0.5 FTU, the CODMn is less than 1.5 mg/L, and the iron content is less than 0.05 mg/L (expressed as Fe).
In general, if the filtered water flows through a 5 μm security filter and the effluent still fails to meet its SDI requirements, an additional treatment process should be considered based on the specific circumstances. If the iron content is too high, the iron removal process is considered in the pretreatment.
On the other hand, in order to prevent the concentration of some insoluble salts on the membrane surface due to the concentration of water in the RO system, it is necessary to perform chemical dosing treatment, and it is generally recommended to add the reverse osmosis antiscalant.
Shadow carving is one of the design techniques of stone carving. A new handicraft developed on the basis of the early "needle black and white" craft. The earliest works were not created by Hui'an artists in the 1960s. They are all based on photos, so they are called "shadow carving". This kind of carving is made of jade crystal lake bluestone sawn into flat plates. First, the surface is polished. By using its chiseling characteristics, it can show the white spots. With sharp tools, it can carve out micro dots of different sizes, depths, and densities. Only different levels of black and white can be divided, so that the image is displayed. It is not only delicate and lifelike, but also unique. It is the development of stone carving towards pure artistry, opening up a new path for stone carving production.
Stone Garden Statues,Faux Stone Garden Decor,Stone Garden Animal Statues,Garden Decoration Stone
The universe in the stone is great , https://www.zdsarts.com