scheme decision
According to the raw water source and the required treated water quality, the color and turbidity are the two target items to handle. Accordingly , filtering process is chose. Flocculation is also necessary to be used prior to filtering considering a certain turbidity in order to make sure the cleaning efficiency. Consequently, we scheme to use the process combining the flocculation and filtering .
process flow chart:
Flocculation dosing
↓
Raw water → water collecting pump→mixing pipe→integrated high-effected auto-backwashed filtering device →clean water pond →lift pump→water use point ↑
Disinfection dosing
Note: both water collecting pump and lift pump are not covered in the quote.
water filtering process description
- A Flocculation dosing device to make the flocculating agent go through and mix into the raw water within the mixing pipe. Then the dosed water enter the reacting tank of the integrated high-effected filtering device . There through multistage rotational flow , organics ,suspended materials and colloid in the water combine with flocculating agent resulting in larger flocs .
- Those produced flocs together with water go into the sedimentation tank and settle down to the bottom with the action of gravity and inclined tube .
- Then water is decanted from the sedimentation tank to the filtering tank where smaller flocs are traped over the surface of the filtering layer of quartz sand while clean water go through the layer and go into the clean water tank being ready for use.
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process features and equipment function description
1.1 equipment features
The dosing device is for dosing flocculation agent to turn the suspended materials into flocs and disinfector to kill Bacteria, and it therefore increases the performance of the integrated water filtering system.
The dosing device is designed to use a single mixer with a single chemical barrel . Using imported flocculation dosing metering pump makes dosage control stable and accurate. This device covers chemical dissolution , a dissolved solution tank and a metering pump. The tanks are made of PE
1.2 integrated gravity auto-backwashed water filtering device
This integrated gravity auto-backwashed water filtering device is our R&D product. It is a new general one based on our absorption of both domestic and international technology in water treatment. It has naturals of fast construction period, consolidated investment, compact layout, flexible, small footprint, effluent quality , simple operation and maintenance and is desirable equipment for water supply serving towns or industrial and mining enterprises. Treated water meets national "drinking water health standards" and the it’s appearance provides a more convenient access for urban water supply, and other small water purification station of industrial or mining enterprises .
Body tanks of the whole device are factory-welded stainless steel or factory-coated carbon steel tanks in our company . The finally finished device from our workshop is transported to local site and there can be assembled and put into use. This helps to make a fast construction period.
The harsh design of our integrated water filtering device is fully based on different water quality in different places. Apart from a right option in dosing amount , we also increase a special grid with flocculating reacting process in order to achieve an enough full flocculating reaction. The design of surface load is more conservative here to increase the shock load capability of the equipment and make our equipment fit to a more wide range of water treatment. Filtration system uses distribution with a small resistance for deep slow sand filtration to ensure a filtered water turbidity ≤3 degrees.
The integrated gravity auto-backwashed water filtering device display an excellent design with easy operation and maintenance , auto-operating by clever use of hydraulic characteristics requiring less specialized operator when the people on the street can operate the device perform automatically until the end.
Backwash operates automatically once a certain extend of block over the surface of filtering layer appears. No moving parts are equipped with the device and the fault is almost none happen with reliable operation and easy maintenance.
The entire integrated device composes of two main parts, the grid rotational flow reactor, fast inclined tube settler and gravity valveless filter. The technology and performance of these two parts are introduced as follow:
