Wastewater treatment plants - Aquaimpex - čištění vody a ekologické systémy

Packed wastewater treatment plants

Purpose:

Packed series is another type of wastewater treatment plants. New series utilises up-to-date knowledge of the wastewater treatment field and experience of practice got from several year active operation. These treatment plants are intended for treatment of small isolated sources of wastewater as e.g.: satellite small townships, hotels in mountains, camps, motels, service stations, small factories.

Packed wastewater treatment plants (BC) are offered in capacities of 35, 50, 75, 100, 150, 200, 250, 300 to 450 Population Equivalent (PE). The capacity of a treatment plants can be modified by requirements. Treatment plants of higher capacity can be supplied for big sources of wastewater.

Description of design

The bioreactor is a vessel partitioned into several interdependent zones hydraulically interconnected. These zones include mechanical debris collection, sand traps, denitrification, nitrification and final sedimentation zones.

Legend:

1. Inflow, 2. Debris trap or screen, 3. Denitrification zone, 4. Baffle plate, 5. Nitrification (activation) zone, 6. Sedimentation zone, 7. Effluent trough, 8. Outflow, 9. Sludge return, 10. Aeration system

Description of design

Wastewater is first screened to remove larger mechanical impurities by means of debris traps for small plants and by screens mechanically or manually cleaned for bigger plants. Then mechanically screened wastewater enters a denitrification zone where, when mixed with return activated sludge, the first treating processes in wastewater start. Then wastewater under treatment with return activated sludge flows on to nitrification zone – aerated. Other treating processes continue to remove contaminating materials from wastewater. Clear water is separated from activated sludge in the final sedimentation zone. Water flows out and sludge returns back to the system.

Wastewater treatment plants up to 300 PE capacities are supplied as factory-manufactured products – plastic or rust-resistant steel tanks with built-in technology, those of greater capacities are supplied as plant constructions with the technology to be installed. On reconstructing wastewater treatment plants the existing tanks are reused and the plant auxiliary facilities are modernised, if need be. On treating industrial wastewater an aeration tank project is tailored to a size required and a degree of chemical pre-treatment is proposed and designed, if need be (wastewater of textile industry…).

Structural drawing

Basic Specifications:

PACKED PLANTS (BC)			BC 35	BC 50	BC 75	BC 100	BC 150	BC 200
Population to serve up		PE	35	50	75	100	150	200
BOD5 load		kg/day	2,1	3	4,5	6	9	12
Wastewater amount		m3/day	7	10	15	20	30	40
Power input		kW	1,1	1,1	1,5	1,5	3	3
Gross weight		kg	850	1000	1200	1500	2400	3000
Height of inflow	A	m	1,8	2,3	2,3	2,3	2,3	2,3
Height of outflow	B	m	1,3	1,7	1,7	1,7	1,7	1,7
Dimension	CxDxV	m	4×2,16×2,08	4×2,16×2,58	5×2,16×2,58	6,5×2,16×2,58	5×2,16×2,58	6,5×2,16×2,58
Number of containers	N	m	1	1	1	1	2	2

PACKED PLANTS (BC)			BC 250	BC 300	BC 350	BC 400	BC 450
Population to serve up		PE	250	300	350	400	450
BOD5 load		kg/day	15	18	21	24	27
Wastewater amount		m3/day	50	60	70	80	90
Power input		kW	3	3	3	3	4,4
Gross weight		kg	3800	4000	4500	5000	5500
Height of inflow	A	m	2,3	2,3	2,3	2,8	2,8
Height of outflow	B	m	1,7	1,7	1,7	2,3	2,3
Dimension	CxDxV	m	5,5×2,16×2,58	6×2,16×2,58	6,5×2,16×2,58	6,5×2,16×3,08	7×2,16×3,08
Number of containers	N	m	3	3	3	3	3

Efficiency

Essentially, the bioreactor combines all functions of conventional biological advanced treatment plants it operates with low sludge load, higher sludge age and reaches higher treatment performance. Reductions of BSK5 and Total Suspended Solids (SS) under 30 mg/l are easily achievable. If observing the Operating Regulation of Wastewater Treatment Plants the below tabulated values can be obtained.

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