The Municipal has two sewer lines. The first sewer line was constructed in 1981 and commissioned in 1983. This sewerage system comprises of 6.3 km of gravity sewer (225mm diameter draining waste water into 280mm and 400mm diameter uPVC) and then discharging into the waste stabilization ponds located near Mirambo barracks. This sewer line starts from Tabora Secretarial College along Itetemia road; then along Boma road to the ponds.
Sewerage Reticulation System (length, size of existing and additional network, length and size of rehabilitated work)
The existing sewerage system has a total length of 20 km which consists of trunk sewers (160mm to 400mm diameters) covering a distance of 9.5 km and lateral sewers (150mm to 200mm) covering a distance of 10.513 km. The trunk sewers have a maximum diameter of 400mm and design flow rate of 39.0m3/hr. However, due to inadequate lateral sewers, the system is currently serving about 6% of the urban population.
The existing network rehabilitated in the year 2002 under USRP and currently it is performing well although its coverage is not sufficient. In the future,we are planning to construct the oxidation ponds at Malolo and air port areas, so that most of the customers will access this service, this will include the construction and expansion of main sewer lines and laterals in various parts of the town.
Currently, there is one pumping station for sewerage system, located at Kazima Secondary school; Sewage is pumped to the main sewer, then gravity to the waste stabilization ponds, near Mirambo Barrack.
The pump is owned and located at Kazima Secondary school; its pumping capacity is 80m3/hr at the head of 18m.
Treatment Plants (type, process, and capacity)
The sewage treatment system comprises of three (3) compartment start with anaerobic, facultative and maturation ponds, arranged in series located near Mirambo Barrack, about 3 km away from the town center. The ponds have 150m x 50m dimensions and an average depth of 1.5m. The system is capable of handling 64,500m3 of sewage at a time. Also there are sludge ponds which receive waste water from the onsite sanitation; the sludge is emptied by cesspit tanker owned by Municipal Council and discharge at these sludge ponds owned by TUWASA at minimum fee of Tsh.2,000.00 per cubic meter.
The designed capacity of the treatment plant is 12,000m3/day. Effluent Quality is not measured.Since no overflow of effluent due to inflows very low as compared to the designed capacity of waste stabilization Ponds. Ref the table below:
Effluent quality (physical, chemical, and bacteriological) and level of compliance to waste water quality monitoring program and standards for each wastewater quality parameter.
No overflow of effluent since the inflows is very low as compared to the designed capacity of waste stabilization ponds.
Sludge Disposal (quantity, mode of disposal, and compliance to environmental laws)
The sludge from sludge ponds are disposed direct to the land and utilized as agricultural manure. There are no industries in Tabora; the sludge is a result of only domestic wastes which are normally good fertilizers. These sludge disposal ponds are used by cesspit emptier from the cesspit tanks and they are different from waste stabilization ponds. Waste Stabilization Ponds meaning those Ponds having direct connection to the Sewerage system and the Slug Ponds are those Ponds used to collect waste from customers who are not connected to Sewerage system.
No effluent from waste stabilization ponds, as the result no any effect to environment and digested sludge from sludge ponds has no effect since it handed accordingly.