Lintang Tankworks Septic and sewage systems in PE and FRP

Wastewater & sanitation systems

Phase 1: 6 to 150 PE (population equivalent). Septic tanks and sewage treatment systems, each series with its own sample licence.

Typical section: horizontal bio-filter septic tank Section through a horizontal bio-filter septic tank buried in a sand-bedded pit on a concrete base. Raw sewage enters by the inlet pipe on the left and is turned down into the primary settling chamber. Settled liquid passes through a transfer pipe in the partition, down to the floor of the filter chamber, rises through the bio-media and leaves, filtered, by the outlet pipe on the right, which sits lower than the inlet. Two manhole covers sit at ground level; the one over the settling chamber gives de-sludging access. Diameter D, length L and water level H2 are given per model in the schedules; invert levels are to be confirmed. TWL DE-SLUDGING ACCESS MANHOLE COVER IL INLET PRIMARY SETTLING BIO-MEDIA FILTER IL OUTLET SAND BEDDING CONCRETE BASE GL D H2 L
Section: bio-filter tank PE and FRP series, horizontal tank shown.

Notes

  1. Illustrative typical section, not to scale.
  2. D, L and H2 per model schedule. Invert levels (IL): TBC.
  3. Tank and covers by Lintang Tankworks. Contractor installs.
Product lineRange
PE Bio-Filter septic tankRotomolded HDPE, needs no power 6–18PE
FRP Bio-Filter septic tankFibreglass reinforced polyester, needs no power 8–30PE
LT small sewage treatment systemFRP tank aerated by blowers, also for rent 40–150PE

Portfolio concept. Fictional manufacturer, sample data.

PE and FRP tanks, made in Malaysia

Sample company profile. A fictional Malaysian maker for both materials: rotomolded polyethylene and fibreglass reinforced polyester, from household septic tanks to small sewage treatment systems.

photo-tanks.webp Sample site photo: a fibreglass septic tank lifted into place on crane slings. Stand-in for Lintang Tankworks dispatch photos. Photo: Project Kei, CC BY-SA 4.0, Wikimedia Commons (cropped).
Detail B Same photo, inlet port enlarged.

Company notesSample

  1. Dispatch point: Nilai, Negeri Sembilan.
  2. In-house rotomoulding (PE) and FRP lay-up under one roof.
  3. Three series: PE Bio-Filter septic tank, FRP Bio-Filter septic tank, LT small sewage treatment system.
  4. Sample services: PE calculation and SPAN / IWK submission support.

Three sample licences, one for each series

MS 2441-1 and MS 2441-2. For this portfolio concept, the septic tanks and the sewage treatment system each carry a sample product-certification licence to their Malaysian Standard.

Approvals schedule Sample data for this portfolio concept
No. Sample licence Standard Series Since SPAN ref.
1 SAMPLE-PE-01Sample MS 2441-1:2012 PE Bio-Filter septic tank Sample Sample
2 SAMPLE-FRP-02Sample MS 2441-1:2012 FRP Bio-Filter septic tank Sample Sample
3 SAMPLE-SSTS-03Sample MS 2441-2:2014 LT small sewage treatment system Sample Sample

Licence numbers are sample placeholders for this portfolio concept, not real SIRIM QAS licences.

Submission support from Lintang TankworksSample

  1. 1PE calculation

    Population equivalent worked out for the submission.

  2. 2SPAN / IWK submission

    Sewerage submission services for the tank or treatment system.

  3. 3Resubmission

    Resubmission services when a submission comes back.

Standards and authorities

SIRIM QAS
Malaysia's product certification body. MS 2441-1:2012 covers PE and FRP septic tanks, MS 2441-2:2014 covers small sewage treatment systems.
SPAN
Septic tanks built to the Malaysian Sewerage Industry Guidelines Volume V and the MS 1228:1991 code of practice.
IWK
Malaysia's national sewerage operator; desludging every 2 years is typical.
EQA
Environmental Quality Act discharge limits; an LT system is designed to Standard A.

Three series cover 6 to 150 PE with no gap

6 to 150 PE. Up to 30 PE, a bio-filter septic tank treats sewage with no power. Above 30 PE, the LT adds air from a blower. Pick the series by PE first, then by site.

Measured PE scale, 0 to 150. PE Bio-Filter covers 6 to 18 PE with 7 models, FRP Bio-Filter 8 to 30 PE with 7 models, LT 40 to 150 PE with 8 models. 31 to 39 PE is served by LT-40. PE Bio-Filter6–18 FRP Bio-Filter8–30 31 LT40–150 0 25 50 75 100 125 150
Measured PE scale, 0 to 150 Circles mark model ratings. Dashed: 31 to 39 PE, served by LT-40.

Reading the range

  1. 31 to 39 PE: use LT-40, the smallest LT model.
  2. 8 to 18 PE: both bio-filter series fit. FRP adds high flexural strength and 150 mm pipes.
  3. Not sure of the PE? Lintang Tankworks offers PE calculation and SPAN / IWK submission.
Series comparison Sample data
PE Bio-Filter FRP Bio-Filter LT
PE range6–188–3040–150
Models778
ProcessAnaerobic bio-filterAnaerobic bio-filterAerated, activated sludge
Power neededNoneNoneMains, for 2 blowers
MaterialRotomolded HDPEFRPFRP
Pipe size100 mm150 mm150 mm
Warranty5 years5 years8 years

Above 150 PE a full sewage treatment plant is needed. Talk to Lintang Tankworks' engineers.

Find the model for your PE

No pump, no power, no moving parts

PE and FRP Bio-Filter, 6 to 30 PE. Sewage settles in the first zone, then rises through plastic bio-media and leaves by a lower outlet. The flow runs by gravity alone.

Typical section: vertical bio-filter septic tank Section through a vertical bio-filter septic tank buried in a sand-backfilled pit on a 150 mm concrete base over lean concrete. Raw sewage enters by the higher inlet pipe and is turned down into the primary settling zone, passes under the filter chamber, rises through the bio-media and leaves, filtered, by the lower outlet pipe to the drain. Manhole covers at ground level; the smaller opening gives isolated, direct de-sludging access to the settling zone. Diameter D, height H1 and water level H2 are given per model in the schedule; invert levels are to be confirmed. TWL BIO-MEDIA FILTER PRIMARY SETTLING IL INLET IL OUTLET DE-SLUDGING ACCESS MANHOLE COVER GL D H1 H2 1 2 3 4 5 6 7
Section: bio-filter tank Illustrative, not to scale. Select a layer to isolate it.

Four states of the water

  1. Raw Enters from the last manhole by the higher pipe and turns down into the settling zone.
  2. Settled Solids settle in the outer zone. The flow passes under the filter chamber.
  3. Filtered Rises up through the plastic bio-media: upflow anaerobic filtration.
  4. Discharged Leaves by the lower pipe to the public drain.
Power
None. No lift pump, no moving parts.
Desludging
Every 2 years, through the separate settling-zone opening. Refill with water after.
Tank
Leakproof. Resists rust and most chemicals in soil and sewage.

Seven light, leakproof tanks for 6 to 18 PE

PE Bio-Filter septic tank, 6 to 18 PE. Rotomolded polyethylene, one horizontal and six vertical models. Light and compact, so they are easy to handle and install where working space is limited.

Schedule: PE Bio-Filter MS 2441-1:2012, sample licence SAMPLE-PE-01Dimensions in mm, capacity in litres.
Model Type PE DDiameter LLength H1Height H2Water level Capacity
mmmmmmmmL
LP-6HHorizontal613002550130010502930
LP-6VVertical61550–185015502920
LP-8Vertical81600–198016803380
LP-10Vertical101650–208017803810
LP-12Vertical121700–217018704240
LP-15Vertical151800–223019304910
LP-18Vertical181850–237020705560
Pipe
100 mm inlet and outlet
Power
None. Anaerobic bio-filter, no moving parts.
Material
Rotomolded HDPE. Leakproof, resists rust.
Site
Suits coastal and high water-table areas.
Warranty
5 years, manufacturing defects. Void if the installation manual is not followed.
Certified
MS 2441-1:2012, sample licence SAMPLE-PE-01Sample
Measured PE scale, 0 to 150, with the PE Bio-Filter range of 6 to 18 PE picked out. Its seven models are rated 6, 6, 8, 10, 12, 15 and 18 PE. PE Bio-Filter6–18 FRP Bio-Filter8–30 LT40–150 0 25 50 75 100 125 150
Two ways to 6 PE: LP-6H and LP-6V drawn to one scale Simplified sections of the two 6 PE models side by side. LP-6H, horizontal: length L 2550 mm, height H1 1300 mm, water level H2 1050 mm. LP-6V, vertical: diameter D 1550 mm, height H1 1850 mm, water level H2 1550 mm. L 2550 H1 1300 H2 1050 D 1550 H1 1850 H2 1550 LP-6H HORIZONTAL LP-6V VERTICAL
Two ways to 6 PE Same scale, mm. LP-6H stands 550 mm lower; LP-6V is 1000 mm shorter on plan.

High-strength FRP for high water tables and deep burial

8 to 30 PE. The same upflow bio-filter as the PE series: no pump, no power, no moving parts. The fibreglass shell has high flexural strength. FRP takes over above 18 PE, and for deep burial at any PE by Lintang Tankworks' guide rule. On a high water table it is anchored and strapped, as drawn.

Horizontal FRP bio-filter tank anchored against a high water table End section through an anchor strap of a horizontal FRP bio-filter tank, cut through the tank legs, with the groundwater table above the tank invert. The tank stands on a 150 mm grade 30 N concrete base with one layer of BRC-A9 mesh, on 50 mm lean concrete. The base edge sits 300 to 600 mm from the pit wall, the working space. A 20 mm SS304 strap passes over the tank and is tightened with a stainless steel turnbuckle just above a 12 mm stainless steel hook cast in the base, so buoyancy is resisted by the straps and the base. The tank is filled with water to top water level before sand backfill is compacted in 150 mm layers. A 100 mm 1:2:4 concrete slab with BRC-A9 mesh covers the tank, with brick sump manhole necks and covers above. An inset long section, not to scale, shows the two necks, the straps, the top water level and the 150 mm inlet and outlet pipes laid at a 1:100 fall. Invert levels are to be confirmed. Tank internals are omitted. GWT 300–600 150 50 100 TWL GL FALL 1:100 FALL 1:100 LONG SECTION, NTS 1 2 SAND BACKFILL 150 MM LAYERS TO RIM 3 FRP TANK HORIZONTAL FILLED TO TWL 4 SS304 STRAP Ø20 SS TURNBUCKLE 5 SS HOOKS Ø12 4 NOS, IN BASE 6 BASE 150, 30 N BRC-A9, 50 LEAN 7 PIPES Ø150 8 SLAB 100 1:2:4, BRC-A9 9 BRICK NECKS

Detail notes

  1. The SS304 straps and the base resist buoyancy from the GWT.
  2. Fill the tank to TWL before backfilling.
  3. Invert levels TBC.
Anchorage detail: FRP tank Horizontal tank, end section at a strap, tank internals omitted; long section inset. Not to scale. Dimensions in mm.
Schedule: FRP Bio-Filter MS 2441-1:2012, sample licence SAMPLE-FRP-02Dimensions in mm, capacity in litres.
Model Type PE DDia. LLength H1Height H2Water Cap.
mmmmmmmmL
LF-8H815002220150012003360
LF-8V81650–193015803380
LF-15H1515503010155012504910
LF-15V151900–208017304910
LF-20V202050–217018206010
LF-28H2817003890170014007780
LF-30H3017004110170014008220
Pipe
150 mm inlet and outlet
Warranty
5 years on manufacturing defects
Licence
SAMPLE-FRP-02Sample

Aerated treatment designed for Standard A effluent

40 to 150 PE. A pre-fabricated FRP tank in two chambers. A diaphragm blower pushes air through a diffuser to treat the flow.

  1. RawSewage enters the aerobic reactor tank (ART).
  2. SettledSolids settle in the lower zone of the ART.
  3. AeratedAir from the diffuser treats the rising flow.
  4. ClarifiedThe final settlement tank (FST) clarifies it.
  5. DischargedTreated effluent leaves the outlet.
Typical section, LT small sewage treatment system (40 to 150 PE) Horizontal FRP tank with two compartments, in a sand-backfilled pit on a reinforced concrete base, under a concrete slab with two manholes. Sewage enters the aerobic reactor tank (ART) at the right, drops into the lower anaerobic settling zone and rises through the aerobic up-chamber, where a diffuser fed by blowers at grade (1 duty, 1 standby) releases air. A transfer pipe at the top of the sloped partition carries it into the final settlement tank (FST). Clarified effluent passes under the outlet baffle and leaves by the outlet pipe at the left, which sits lower than the inlet. Dimensions L, H1 (overall height) and H2 (water level) are given per model in the schedule; invert levels are to be confirmed. TWL FST AEROBIC ANAEROBIC ART BLOWER HOUSING 1 DUTY + 1 STANDBY IL TBC IL TBC H1 H2 L SAND BACKFILL 1 2 3 4 5 6 7
Section: LT, 40 to 150 PE Illustrative, not to scale. L, H1 and H2 per model on sheet 09.
Process
Upflow activated sludge, aerated
Blowers
2 diaphragm blowers, 1 duty + 1 standby
Supplied
Blowers and air diffuser by Lintang Tankworks. The installer fits them.
Effluent
Designed for EQA Standard A
Pipe
150 mm inlet and outlet
Certified
MS 2441-2:2014, sample licence SAMPLE-SSTS-03Sample
Warranty
8 years
Rental
Available for LT 40 to 150 PE

Needs mains power on site to run the blowers.

Ask about LT rental

Only the length changes with PE

LT-40 to LT-150. Every model is 2300 mm wide and 2500 mm high, with water at 1900 mm. Pick the length for your PE. All eight are designed for Standard A, the stricter of the two EQA discharge limits.

Schedule: LT, 40 to 150 PE MS 2441-2:2014, sample licence SAMPLE-SSTS-03Dimensions in mm, capacity in litres.
Model PE LLength WWidth H1Height H2Water level Capacity Length to scale
mmmmmmmmL0 to 5400 mm
LT-404016002300250019006990
LT-505019502300250019008520
LT-6060230023002500190010050
LT-7575280023002500190012240
LT-9090330023002500190014420
LT-110110400023002500190017480
LT-130130470023002500190020540
LT-150150540023002500190023600

LT schedule notes

  1. Invert levels per site: TBC.
  2. Synthetic sample dimensions: the length holds 900 L plus 150 L per PE, and capacity is W × L × H2 (see docs/SOURCES.md).
Discharge limits, new systems Environmental Quality (Sewage) Regulations 2009, P.U.(A) 432/2009, Second Schedule (i)
Parameter mg/L unless stated Standard A LT design Standard B  
Temperature, °C4040
pH value6.0–9.05.5–9.0
BOD5 at 20 °C2050
COD120200
Suspended solids50100
Oil and grease5.010.0
Ammoniacal nitrogen, enclosed water body5.05.0
Ammoniacal nitrogen, river10.020.0
Nitrate-nitrogen, river20.050.0
Nitrate-nitrogen, enclosed water body10.010.0
Phosphorus, enclosed water body5.010.0
Standard A
Inland waters upstream of a water supply intake (Third Schedule)
Standard B
All other inland and Malaysian waters

Enter your PE, get the certified model

6 to 150 PE. Add your site conditions. The sheet picks the smallest certified model that covers your PE and draws it to its real proportions.

Example: 8 PE. Type your own, up to 150 PE.Whole number, up to 150 PE. The model and its section redraw as you type.

Site conditions
All 22 models
Schedule: all models mm, capacity in litres
Series Model PE Type D / WDia. or width H1Height Capacity

Enter a PE to see the certified model.

How the model is chosen

  1. Up to 18 PE: PE Bio-Filter septic tank.
  2. 19 to 30 PE: FRP Bio-Filter septic tank.
  3. Deep burial picks FRP at any PE up to 30, for its flexural strength: Lintang Tankworks' guide rule.
  4. A high water table suits both bio-filter series, so the model stays the same. Anchor and strap the tank to its base.
  5. 31 to 150 PE: LT sewage treatment, which needs mains power for its blowers. 31 to 39 PE takes the LT-40.
  6. Two models at the same PE: vertical for a limited footprint, horizontal for a shallower dig.
  7. Above 150 PE: a full sewage treatment plant. Talk to Lintang Tankworks' engineers.

Enter 1 to 150 PE to draw it

Live section Drawn to this model's real proportions. Dimensions in mm.
Measured PE scale, 0 to 150 PE: PE Bio-Filter 6 to 18, FRP Bio-Filter 8 to 30, LT 40 to 150. The cyan marker shows the PE you entered. PE Bio-Filter6–18 FRP Bio-Filter8–30 LT40–150 0 25 50 75 100 125 150 PE

Install in 7 steps, desludge every 2 years

PE, FRP and LT. Lintang Tankworks supplies the tank. Your contractor installs it in this order. If the installation manual is not followed, the warranty is void.

Lintang Tankworks supplies
The tank with its manhole covers. For LT, also two air blowers (1 duty, 1 standby) and the air diffuser.
Your contractor
Excavation, base, anchoring, backfill, pipes, slab and manhole necks. For LT, also installs the blowers. Blower housing: by others.
  1. 1 Excavate

    Dig the pit with 300–600 mm of working space all round the tank.

    Item 1 · panel A
  2. 2 Base and anchors

    50 mm lean concrete, then a 150 mm grade 30 N base with one layer of BRC-A9. Cast in four Ø12 mm stainless steel hooks.

    Items 2–3 · panel B
  3. 3 Set and strap

    Lower the tank onto the cured base. Tie the Ø20 mm SS304 strap over it and tighten the turnbuckle.

    Items 4–5 · panel C
  4. 4 Fill and backfill

    Fill with water to top water level. Backfill with sand (fine sand recommended), compacted in 150 mm layers up to the rim.

    Items 6–7 · panel D
  5. 5 Pipes

    Compact the backfill at the inlet and outlet. Lay both pipes at a 1:100 fall.

    Item 8 · panel E
  6. 6 Slab and necks

    Cast a 100 mm 1:2:4 concrete slab with one layer of BRC-A9 and the manhole openings. Build brick sump necks to platform level.

    Items 9–10 · panel E
  7. 7 Covers and final fill

    Backfill with sand to platform level and fit the manhole covers. Fill the tank with water to full capacity.

    Items 11–12 · panel F

Item and panel numbers are illustrative (docs/SOURCES.md). Schematic panels, not to scale; invert levels per site, TBC.

Care

  1. Desludge every 2 years, in line with IWK servicing.
  2. Refill the tank with water after every desludging.
  3. Check for unusual odours between services.
  4. Installed properly, the tank lasts 10+ years.

LT start-up

  1. Seed it: fill 1/3 of the capacity with Standard A crude sewage (imported sludge).
  2. Fill the other 2/3 with water to top water level.
  3. The blowers need mains power and a weatherproof housing, by others.

Warranty

PE and FRP
5 years
LT
8 years
Scope
Manufacturing defects only. Void if the installation manual is not followed.

Send your PE on WhatsApp

Lintang Tankworks sales, Nilai. Ask for a model, a sample certificate or a CAD drawing. Lintang Tankworks also does the PE calculation and the SPAN / IWK submission.

Enquire on WhatsApp Send a general enquiry

Opens WhatsApp; choose who to send it to (portfolio demo, no sales number).

Request certificate Request CAD drawing

Put in your message

  1. The PE, or the building type and size so Lintang Tankworks can calculate it.
  2. The site location.
  3. Water table and burial depth, if you know them.
  4. Whether mains power is on site, for an LT.
Phone
Phone on request
Office hours
Mon–Fri 9:00–17:00, Sat 9:00–13:00
Dispatch point
Nilai, Negeri Sembilan
Scan to open this deckOpen this deck on a phone Or send it to your consultant or contractor.

Also ask Lintang Tankworks for

  1. The PE calculation for your building.
  2. SPAN / IWK sewerage submission and resubmission.
  3. LT rental, 40 to 150 PE.

Sheet index

Portfolio concept. Fictional manufacturer, sample data.

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