Shallow Sand Filter for pre-treatment of circulating cooling water in steel plants

Introduction:

The shallow media filtration system (shallow sand filter) consists of one or more standard high-speed filtration units. The water flows through the 

internal water distributor and the water collector.With different media,it can effectively remove particulate matter and reduce turbidity.If put in 

specific filter material, such as activated carbon, anthracite, etc., the corresponding organic matter and ions can be adsorbed and removed.

The filter unit is available in a variety of sizes from 16" (400mm) to 96" (2400mm) with different installation type. The filter can be used as an 

independent filtration system, with the water pump in the existing process, if it is used as a bypass filter, it can also be equipped with its own pump. 

The filter can also be installed on a common pipe with multiple processing units.

This can achieve unlimited filtering capabilities of this system.The backwashing of the filtration system is manual,semiautomatic and fully automatic,

which can be started by manual button, PLC and pressure difference.The backwash cycle and backwash time are adjustable and are set to 3 minutes 

before delivery.This control is implemented by the DLFCS automatic filter control system.Users can also choose PLC control system, which can be 

realized high-demand control  such as centralized or remote communication.

Advantages:

1. The core components are imported origin (BERMAD, BACCARA, SIEMEN, MITSUBISHI).

2. The filter unit adopts a single-chamber design,which has better backwashing effect and lower rate on sand leak.

3. The water collector is available in stainless steel/ABS material for a longer life.

4. The outlet pipe is set at the bottom of the unit with smaller water resistance,convenient maintenance.

Features:

1. High filtration speed and low pressure loss,completely solve the problem of slow filtration speed and small flow of ordinary mechanical media filter.

2.With modular settings,small footprint,less piping,low investment,the space is reduced by more than 40%, and the piping engineering capacity is reduced by more than 50%.

3.More functions with manual,semi-automatic,fully automatic backwash operation to meet your needs.

4.The backwash water source can be selected within the system,water tower or external water source, and can be automatically switched (special requirements).

5.It can be a single filter unit or a combination of multiple filter units,and the processing flow capacity can be expanded arbitrarily.

6.The shell and tubes are carbon steel Q235B by phosphate surface treatment with internal and external surface anticorrosion.It can also be made of stainless steel.

Working principle:

Filter status:

The unfiltered water is evenly distributed through the water distributor, and the water passes through the packing layer in the filter in a laminar flow 

state. When water flows through the packing layer, impurities are trapped within the packing layer. There are a plurality of evenly distributed water 

collectors at the bottom of the filter. The filtered water is evenly collected and taken out, and the flat flow filtration can filter the filter at a high flow 

rate, and still achieve better filtration effect.

Backwash status:

As the impurities accumulate in the packing layer, the internal head loss will increase. When the inlet and outlet head loss reaches the set value or 

reaches the set time, the system will automatically activate the constant pressure difference device to switch to the backwash state. When the 

backwash is over, the hydraulic valve changes the water supply direction to achieve Backwashing makes it easier to clean the accumulated impurities.

Technical parameter:

Technical drawing:

Application field:

*Industrial processes and water treatment:

Pre-treatment of circulating cooling water in steel plants
Pre-treatment of feed water for power plant boilers 
Filtering of process water in the chemical plant 
Oil extraction - water injection - filtration 
Primary treatment of oily wastewater from oil refineries 
Pre-treatment water filtration in the automotive manufacturing painting workshop 
Pre-filtration for the preparation of ultra-pure water in the electronics industry 
Recycling of White Water and Fiber Retention in Paper Mills 
Pre-treatment of wastewater from desizing and rinsing processes in textile dyeing and printing factories 
Filtering of suspended metal hydroxides from electroplating wastewater 
Primary purification of process water in the pharmaceutical factory 
Recycling of water used for cleaning food processing raw materials 
Purification of water used for brewing at the brewery 
Pre-treatment of water used in beverage production 
Filtering of cooling water in chemical fiber production 
Rubber Factory Circulating Cooling Water Treatment 
Plastic processing cooling water system 
Pre-treatment of metalworking emulsion wastewater 
The mining excavation wastewater is first settled and then filtered. 
Recovery and treatment of wastewater from coal washing and selection processes 
Cooling water protection for ceramic kilns 
Cooling water filtration for glass production line 
Treatment of wastewater from battery production 
Aluminum profile processing and cleaning water filtration 
Pre-treatment of leather tanning and dyeing wastewater 
Ship ballast water treatment 
Industrial steam condensate recovery and filtration 
Compressor and refrigeration machine cooling water system 
Central air conditioning chilled water/cooling water pre-filtering 
Industrial park centralized sewage treatment plant - tertiary treatment 
The pre-filter protection for the reverse osmosis (RO) system 
The pre-stage protection filtration of the ion exchange system 
The pre-filtration stage of the ultrafiltration (UF) system 
The pre-stage coarse filtration of the microfiltration (MF) system 
Purification of final rinse water for industrial products 
Water supply filtration for pilot-scale equipment in the laboratory 
Boiler wet flue gas desulfurization wastewater treatment 
Industrial flue gas spray washing water circulation filtration 
Recovery of wash water from industrial sites 
Impurity filtration during the regeneration process of waste lubricating oil

*Municipal water supply and sewage treatment:

Primary filtration of water supply plants that use surface water (rivers, lakes, reservoirs) as their source 

Purification treatment of small-scale centralized water supply stations in rural areas 

Water quality maintenance at intermediate pressure stations in urban water supply networks 

Secondary water supply tank water inlet filtration for high-rise buildings 

Residential community quality-based water supply (reclaimed water) system 

The advanced treatment (removal of suspended solids) of the effluent from the secondary biological treatment stage of the urban sewage treatment plant 

The core filtration unit for reclaimed water treatment 

The pre-treatment stage of the membrane bioreactor (MBR) process 

Filtering before UV disinfection in wastewater treatment plants 

Purification treatment of urban rainwater collection and utilization systems 

Purification of water supplied to landscape rivers and lakes 

Municipal sweeping and greening water treatment station 

Fire water tank replenishment and filtration 

Swimming pool recirculating water treatment system (as the main filter after the hair collector) 

The wave-making pool of the water park, and the river water circulation filtration system 

Public fountains, water feature recirculation water filtration 

Wash shop recirculating water reuse system 

Pre-treatment in the process of treating landfill leachate 

Sewage pre-treatment at the fecal waste treatment center 

Protective filtration of urban sewage pumping stations 

Initial rainwater interception and treatment for municipal water supply pipelines 

Emergency water supply vehicle / Mobile water purification equipment's filtration unit 

Water treatment for temporary living areas at construction sites 

Drinking water pre-treatment at camps and shelters 

The pre-treatment stage of the urban ecological wetland system

*Agricultural irrigation and aquaculture:

Water filtration for the field drip irrigation system (from reservoirs and channel water) 

Headpiece filtration of the greenhouse micro-sprinkler irrigation system 

Filtering of irrigation water from the small pipes in the orchard 

Flower cultivation nutrient solution water supply system filtration 

Filtering the water used for spraying and humidification in the seedling nursery 

Purification of agricultural irrigation using reclaimed water (secondary water) 

Filtering and blocking measures for water extraction from rivers and ponds for irrigation purposes 

Filtering of sand particles and iron-manganese precipitates in well water irrigation 

Purification treatment of fresh water added to fish ponds (for fish, shrimp, and crabs) 

The mechanical filtration process of the factory-based recirculating water farming (RAS) system 

Pre-treatment of water used for seedling cultivation in the nursery facility 

The fish ponds have a water circulation system that filters out feces and leftover food. 

Water filtration for seafood holding ponds 

Filtering before ozone or ultraviolet disinfection of aquaculture products 

Filtering of wastewater before it reaches the standard for discharge in aquaculture operations 

Water filtration for aquaculture in processing plants 

Water purification for fish hatcheries 

Drinking water purification for livestock farms (pigs, cows, chickens, etc.) 

Water filtration for spray cooling in livestock sheds 

The filtration and reuse of the liquid after the separation of livestock and poultry manure slurry and residue 

Cleaning water filtration in the milking hall 

Process water filtration in the feed processing workshop 

The recycling and filtration of water used for processing and cleaning agricultural products (such as vegetables and fruits) 

Water filtration for tea sprinkler irrigation 

Filtering of irrigation water for Chinese medicinal herb cultivation

*Business and public service facilities:

Total inlet filtration of hotel domestic water supply 

Central air conditioning cooling water pre-filtering in large shopping malls 

Water reuse system in office buildings (for flushing toilets and landscaping) 

Boiler water pretreatment for public institutions such as schools and hospitals 

Water pre-treatment in the hospital laundry room and preparation room 

Cooling water filtration for precision air conditioning in data center computer rooms 

Gymnasium, fitness center, swimming pool water treatment 

Recycling water treatment for bath centers (saunas, hot springs) 

Pre-treatment of kitchen cleaning water for large-scale catering enterprises (after oil separation) 

The spray for preserving freshness in the fresh food section of the supermarket is filtered water. 

Primary filtration of process water for breweries and beverage factories 

Water treatment system for self-brewing beer in the beer house 

Photography printing shop water treatment system 

Large water washing equipment in the laundry facility has an inlet water filtration system. 

Wastewater treatment in the repair workshop of an automobile 4S store 

Wastewater Recycling System for Car Wash at Gas Stations 

Reuse of water for vehicle washing at the logistics center 

Airport aircraft deicing fluid recovery and treatment system 

Recycling and filtration of water used for cleaning at the railway station platform 

Wastewater treatment in the port and wharf area 

Filtering of the water source irrigation system for the golf course lake 

Pond irrigation system for football fields and race track lawns filtration 

Theme park landscape water bodies, water circulation and filtration for recreational use 

Museum and library air conditioning systems for maintaining constant temperature and humidity, as well as water filtration for humidification purposes. 

The large-scale water feature installation at the exhibition center undergoes continuous filtration. 

Air conditioning cooling water system of the cinema 

Pre-treatment of wastewater from slaughterhouses and meat processing plants 

Simple treatment of water used for cleaning the market area 

Evaporative cooling water filtration for cold storage facilities 

Pharmaceutical chain store's dispensary uses water filtration

*Applications in Special and Emerging Fields:

Seawater desalination pretreatment (removal of suspended solids in seawater) 

The final-stage filtration of the ship's domestic sewage treatment system 

Water treatment on offshore drilling platforms 

Army mobile water supply unit 

Disaster emergency drinking water safety treatment equipment 

Field exploration, water treatment for living at mining camps 

RV campsite water supply system 

Onshore water supply treatment for the yacht marina 

Water filtration for snowmaking at artificial ski resorts 

Purification of water used for ice rink ice-making 

Temporary water supply management for filming crew's outdoor shooting locations 

Nutrient solution circulation filtration in greenhouse greenhouses without soil cultivation 

Hydroponic system in plant factory 

Water purification for laboratory animal rooms 

Biotechnology company uses water for pre-treatment of fermentation medium 

Primary purification of water used in cosmetics production 

Filtering of washing water in the production of lithium battery cathode materials 

Filtering during the recycling process of photovoltaic silicon wafer cutting slurry 

The pre-stage of the security filtration system for ultra-pure water in the semiconductor factory 

Cooling fluid filtration for data center liquid cooling system 

Cooling water filtration for hydrogen fuel cell system 

Filtering of the electric vehicle battery cooling circuit (indirect) 

Groundwater or circulating water filtration for ground/water source heat pump systems 

Solar water heating system water replenishment filtration 

After the fermentation slurry in the biogas project undergoes solid-liquid separation, it is filtered. 

Recovery and Utilization of Condensate Water from Flue Gas Filtration 

Drainage of foundation pit at construction site for reuse or compliance with standards for discharge and filtration 

Recycling and purification of water used for cleaning during the restoration of historical buildings 

Water treatment for the craft processes in the art studio (ceramics, lacquerware) 

Central water treatment systems for large family villas or estates (for irrigation, swimming pools, and water features)