A 3,500 litre treatment unit in Tapin recovers 90 percent of its water, and the measurements behind it are what water policy usually lacks

The Ministry of Industry set out results on 27 August 2026 from a wastewater treatment installation built for the Sentra Sasirangan Timbaan producer cluster in Tapin Regency, South Kalimantan. Sasirangan is the traditional dyed textile of the Banjar people, and the dyeing process is water intensive. Before the installation, effluent from the dyeing baths was going straight into infiltration wells without treatment.

The facility holds 3,500 litres and measures 450 by 200 by 120 centimetres. It runs seven tanks: one electrocoagulation tank with an inverter for initial metal settling, five filtration tanks, and one control tank before discharge. The filtration media are deliberately local, using coconut fibre, charcoal, tile fragments, palm fibre, and purun plant waste.

Nine producers belong to the cluster, employing around 100 workers between them, and each production cycle generates roughly 250 litres of dyeing effluent. Fifteen people received technical training covering operation, maintenance, effluent quality standards, environmental management, and the commercial side of the business. The work ran from March to October 2025 under DAPATI, the industrial technology partnership fund, within the ministry's technology utilisation acceleration programme.

What was actually measured

Laboratory testing produced a full set of before and after figures rather than a single headline claim, and this is the part worth dwelling on.

Hydrogen sulphide fell by 98.75 percent. Oil and grease fell by 97.33 percent. Phenol, the compound of most concern in textile dyeing effluent, fell by 91.66 percent. Biochemical oxygen demand fell by 81.77 percent and chemical oxygen demand by 80.44 percent. Total suspended solids fell by 40.74 percent.

That last figure is the honest one. Suspended solids came down far less than everything else, and the reporting says so rather than quietly omitting it. A results table that includes its own weakest number is a more trustworthy document than one that does not.

Separately, around 90 percent of the treated water is recovered and returned to cleaning equipment and work areas, which reduces the cluster's draw on clean water supply.

Oktaviyanto Jimat Wibowo, head of BSPJI Banjarbaru, described the design intent as simple technology that is easy to operate and built from local materials. Emmy Suryandari, who heads BSKJI, framed the programme as strengthening human capacity so that operators can run the technology independently and sustainably. Minister of Industry Agus Gumiwang Kartasasmita placed it within an industrial transformation that treats sustainability and environmental performance alongside productivity.

Why a small facility carries a large lesson

Sirkularium has spent much of this year examining valuation gaps in the Indonesian resource economy: forest carried at Rp395,000 a hectare against rehabilitation costs of Rp30 to 50 million, reclaimed land counted in hectares but never in condition, burned area measured precisely and valued almost never. The common failure is not absent regulation. It is that the environmental column contains descriptions where it should contain numbers.

This installation is the opposite case, at small scale.

Nine producers, one hundred workers, 250 litres a cycle, six pollutants with measured reduction rates, and 90 percent water recovery. Every claim here is a figure, and every figure can be checked.

That is what makes it useful beyond Tapin. The facility cost a modest sum and serves a cluster most industrial policy would consider too small to instrument. If effluent performance can be measured to two decimal places for nine textile producers in a regency in South Kalimantan, the argument that measurement is impractical for larger operations does not hold.

There is a circularity point too. Recovering 90 percent of treated water converts a disposal problem into an input. The producers reduce their clean water purchase, the discharge volume falls, and the same water does more work before it leaves. That is materials circularity in its most literal form, and it is being practised by nine small enterprises rather than being theorised in a strategy document.

The design choices reinforce the point. Electrocoagulation handles the metal load from the dye baths, which is the fraction least amenable to simple filtration. The five filtration stages then use coconut fibre, charcoal, tile fragments, palm fibre, and purun, all of which are available within the district and can be replaced by the operators themselves without a procurement process. A system built from locally replaceable media has a materially different maintenance profile from one that depends on imported cartridges, and maintenance is where small industry environmental equipment usually fails. Purun in particular is a wetland sedge already harvested locally for weaving, so its use here puts a residue from one local craft into the treatment chain of another.

What the cluster gains commercially is also worth stating. Sasirangan is sold partly on its cultural provenance, and buyers in domestic and export channels increasingly ask about dye effluent. A producer group that can show a laboratory result rather than an assurance is in a stronger position in that conversation, and the same evidence answers any question a regulator might raise about discharge to infiltration wells.

Sirkularium's view

This is a well constructed intervention and the decision to publish the full test results, including the weak one, deserves recognition. For government and public institutions, three observations follow.

First, this measurement format should become the template for small industry environmental programmes. A short standard set of before and after parameters, tested by an accredited laboratory and published, turns a grant into evidence. It also allows the next cluster to be told what performance to expect rather than being sold a general promise.

Second, the 40.74 percent suspended solids result is the most valuable number in the set, because it identifies where the design needs work. Sedimentation capacity, media selection, or backwash frequency are all adjustable. Publishing the gap makes iteration possible, and an installation that is improved in its second version is worth more than one declared successful in its first.

Third, the water recovery rate deserves a rupiah figure. Ninety percent recovery has a value equal to the clean water not purchased plus the effluent charge not incurred, and that number would make the economic case to the next cluster far more effectively than a percentage does. Indonesia values water in several regulatory contexts already. Applying that to a facility like this is straightforward.

The wider point is one this beat returns to regularly. Sirkularium works across solid waste, water, and energy for government and public institutions, and water is the part of the resource economy where measurement is thinnest relative to its importance. A district with nine dyeing workshops and a district with a nickel concession face the same underlying question, which is what the water and land are worth and what a given activity does to them. The methodology is national and applies to both. The difference in this case is simply that somebody ran the tests and published the output.

What to watch next is whether the suspended solids performance improves in a second iteration, whether the DAPATI programme replicates this format across other producer clusters, and whether the water recovery saving is eventually reported in rupiah rather than percentage terms.