Packing wastewater Treatment Plants

Biological treatment
Biological treatment is based on biological reactor BC. This reactor incorporates all stages of the biological treatment, including the separation of the activated biological sludge. The separating settling tank is separating the excessive sludge. The internal structures split tanks into particular compartments enabling all functions of the biological treatment, i.e. biodegradation, nitrification, and denitrification. Internal circulation assures the function of the activated sludge circulation from the separation section.

The group wastewater treatment installations (type BC) are with the service range of 25 to 500 equivalent residents.

The described arrangement of the compact biological reactor enables complex treatment of the municipal wastewater. High efficiency of the separation assures the function of the plant with high-activated sludge concentration. (4 - 6 kg SS / m3).

DESCRIPTION OF TREATMENT PROCESS

Inlet
The wastewater flows to the denitrification section of the plant (DN).

Biological treatment
Mechanically pre-treated water (basket screen) flows into the denitrification zone of the reactor. The organic waste is used as a source of carbon for denitrification processes. Water from the denitrification zone in the activation/nitrification section where separation structures are fixed. Here the excessive sludge is separated from the purified water in the final settling tank. The clean water continues in the recipient. Airlift pumps assure the re-circulation between separation and denitrification zones.
All the sections of the reactor are connected in the closed circuit where activated sludge circulates. In the individual sections there are conditions with different concentration of the dissolved oxygen – a zone with stable oxygen deficit for denitrification and zones with variable oxygen deficit for secondary denitrification processes. The internal circulation serves in the same time for equable distribution of the separated suspension returned from the separation zone.

Sludge management
Production of the excess biological sludge is minimized using the low-loaded activation process. This way the complete simultaneous aerobic stabilization of the sludge is assured. (Sludge age is approximately 30 days.)

GUARANTEED EFFLUENT PARAMETERS

Parameter		Average Performance
BOD55	(mg/l)	20 – 25
COD	(mg/l)	60 – 100
SS	(mg/l)	25 – 30
N-N4	(mg/l)	2 – 5
P total	(mg/l)	5 - 8

Operation personnel
One operator for 2-3 hour weekly will operate the plant, excepting periodical maintenance of the equipment. The operation will be described in details in the Operation Manual supplied with the plant.

LEGEND
DN – Denitrification; ACT – Activation; DОS – Clarifier (separation); NK – Basket screen; DM – Blower; 1.0 – Inlet; 1.1 – Connect DN-АСТ; 1.2 - INLET TO DOS; 1.3 - Recirculation; 1.4 – Outlet; 1.5 – Air system

Type	Num. of persons	Load BSK5 kg/day	Capacity m3/day	Power input kW	Total weight kg	Мeazur- ment м	Num of tanks ks	Inlet level m	Outlet level m
BC 35	35	2.1	7	0.55	850	4x2.16x2.08	1	1.8	1.3
BC 50	50	3	10	0.55	1 000	4x2.16x2.58	1	2.3	1.7
BC 75	75	4.5	15	1.1	1 200	5x2.16x2.58	1	2.3	1.7
BC 100	100	6	20	1.5	1 500	6.5x2.16x2.58	1	2.3	1.7
BC 150	150	9	30	1.5	2 400	5x2.16x2.58	2	2.3	1.7
BC 200	200	12	40	3	3 000	6.5x2.13x2.58	2	2.3	1.7
BC 250	250	15	50	3	3 800	5.5x2.16x2.58	3	2.3	1.7
BC 300	300	18	60	3	4 000	6x2.16x2.58	3	2.3	1.7
BC 400	400	24	80	3	5 400	6x2.13x2.58	4	2.3	1.7
BC 500	500	30	100	4.4	8 000	6x2.16x2.58	6	2.3	1.7

TIME OF DELIVERY - 3-5 weeks after the date of order

WARRANTY
24 months after the date of commissioning, excepting the components where their manufacturer guarantees shorter period.