• GENERAL OPERATION PRINCIPLES OF STORM WASTEWATER TREATMENT STATIONS (SWTS)
  

• DESIGN AND CONSTRUCTION
  
  
• ADVANTAGES

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Current ecological situation in Russia stipulates a very intensive demand for development of modern technologies preventing and eliminating pollution of the environment and imposes the necessity for development for these purposes the market of effective, mobile and affordable ecological services.

One of the most significant sources of pollution of water bodies is a surface runoff coming from urban areas and industrial enterprises. The problem of water pollution by surface runoff is frequently given little concern and thus industrial storm wastewater in many cases gets into water bodies untreated carrying a big amount of organic and suspended substances, oil products, phenols, heavy metal compounds and biogenic elements. Inecs’ scientific and technical information analysis and long-term work experience in development of environment protection technologies from harmful influence allowed discovering of successful solution for this problem. Our company has designed and constructed storm wastewater treatment stations (SWTS) that combine innovative technology, high level of treatment, and are easy and reliable in operation.

APPLICATION

Storm wastewater treatment stations SWTS are designed for deep treatment of industrial storm wastewater bringing water quality level after post-treatment to the discharge norms for fishery bodies.

Technical data

N/N	Name of the installation	Produc-tivity*	Dimensions (m)	Inflow mode (m)		Weight of station (t)	Demand on raw materials and resources
							Heat (Kcal/hour)	Fixed electric power (kwt/hour)	Con-sumed electric power (kwt/hour)	Ser-vicing perso-nell
1	RTS-5	5	6.0x6.0	head flow mode		14	2500	8	3,5
2	RTS-10	10	6.0x6.0			14	8000	15	7,5
3	RTS-15	15	6.0x9.0			23	8000	15	8
4	RTS-30	30	9.0x12.0			36	15000	30	16
5	RTS-50	50	9.0x15.0			42	22000	43	32
6	RTS-75	75	12.0x15.0			62	30000	55	41
*Productivity at full treatment (Nominal cu m3)

OPERATION CONDITIONS :

Stations are designed for operation in regions with: • air temperature – from +50 up to -60? C; • normative snow load – up to 320 kgf/m?; • dynamic air head – up to 100 kgf/m?; • seismic activity – up to rate 9.

Fire danger of the building – Ä category according to Russian Construction Norms and Regulations 2/09/02-85.

Liability rating – II.

Safety margin for its intended purpose – 0.95.

Rating of functional fire risk of the building – Ô5.1 according to Russian Construction Norms and Regulations 2/09/02-97.

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BASIC EQUIPMENT

Pressure hydrocyclone Settling tank with thin-layer modules Filters for sorption and mechanical treatment Skimmer Flocculent preparation installation Sediment tank Sludge filter

* Quantity of block-containers and equipment configuration can vary depending on initial effluent composition and required level of treatment.

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GENERAL OPERATION PRINCIPLES OF STORM WASTEWATER TREATMENT STATIONS (SWTS)

For treatment of industrial storm waters at SWTS we use technological scheme of reagent effluent treatment, which involves hydrocyclone, settling tank with blocks for thin-layer settling, skimmer, filters for mechanical and sorption treatment with synthetic Yorsh-type bed, equipment for collection and processing of sediment and oil products. Experience of exploitation of treatment stations shows that application of the above mentioned scheme allows achievement of wastewater treatment level satisfying discharge norms for fishery bodies.
Technological scheme has two independent lines that allow treatment of 75% of incoming effluent with no decrease in quality of effluent treatment in case one of the lines breaks down.
Physical and chemical effluent treatment. Industrial storm wastewaters get to the treatment stations under pressure conditions and are the headed to hydrocyclones. Pressure hydrocyclones are applied for mechanical treatment of storm effluent, as well as for thickening of sludge extracted from effluent.
Preliminary, for improvement of treatment level, effluent is mixed with coagulant using ejector. Manuflok installation with manual control was designed for preparation and supply of coagulant solution.
After pressure hydrocyclone effluent gets to the settling tank with thin-layer modules.
It is designed for treatment of effluent from insoluble high dispersive admixtures like suspended substances and oil products.
Settling tank is an open-type construction consisting of two chambers – clarifying and sediment thickening. For acceleration of sedimentation process the settling tank has flexible thin-layer modules installed.
Thin-layer settling tank has perforated pipes installed for air regeneration. By air supply to the settling tank there happens an effective shake-up of the settled sediment off the flexible parts of the thin-layer module and thus a valid regeneration of the whole thin-layer module is performed.
The settling tank has a – skimmer – a special device for gathering oil products from the treated water surface into the settling tank.
The effect of effluent clarification in the settling tank is 80% for suspended substances and 95% for oil products.
To increase effluent treatment level from oil products our treatment stations have filters of mechanical and sorption treatment with a fibrous hydrophobic polymer bed – Yorsh-type bed installed in stainless steel cartridges.
Filters of mechanical and sorption treatment provide the process of retention of mechanical admixtures and simultaneous destruction and utilization of oil products by attached to the filter bed microorganisms.
Air-blowers. To provide the technological process with air our company applies rotary air-blowers that are installed in a noise and vibration insulation room. Both air-blowers are connected by an air duct system to the shut-off and control valves.
Air supply control in the effluent treatment process is performed in automatic mode by alternation of motor shaft speed of an air-blower.
Sediment treatment. Sludge and suspended substances drawn from the hydrocyclone are brought to the sediment collection tank; sediment from the settling tank with thin-layer modules and from the post-treatment block is supplied to the sludge filter for dewatering manufactured by Inecs Ltd.
Sludge filter is a stainless steel storage tank with a junction pipe to which replaceable filter bags are attached. Humidity of the dewatered sludge is 75-80%.
Dewatered sludge bags from the sludge filter are transported to a storage and utilization site.

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Storm wastewater treatment stations SWTS are manufactured in a block-modular design from completely prefabricated metal constructions with installed process equipment. This type of construction design allows assembling at the construction site in the shortest time.

A modular building is assembled from unitized block-containers with factory mounted equipment. Containers are assembled to blocks with help of welding on foundation plates. Foundation plate is a monolith reinforced concrete slab. Station building is coated by zinc colored metal covering. SWTS stations are manufactured for operation in cold and temperate climatic regions (closed-type stations), as well as in hot environment (open-type stations

ADVANTAGES

1. All process equipment at the offered treatment facilities is built-in. This allows reducing construction range and using the building area more efficiently.

2. Buildings of treatment stations are supplied in separate modules 3 x 6 x 2.7 m in size.

3. Construction works are done on the customer’s territory

4. High technological resistance of treatment plant operation with minimum surplus of suspended solids and oil products, minimal duration of setting treatment plants at the given technological regime.

5. Easy maintenance of plant equipment, low service costs.

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