A water-treatment job needs a concrete batching plant built around three things general civil sites ignore: aggregate washing to keep silt and organics out of the mix, an enclosed pan or twin-shaft mixer that handles wet, sticky aggregate without residue build-up, and a moisture probe on the sand that trims water at the weigh hopper [S1][S2].
On a 2026-07 survey of batching-plant makers, three reference configurations dominate the 60-180 m³/h band that covers most municipal and industrial water-treatment structure pours: stationary skip-hoist with bucket elevator, stationary belt-conveyor with twin-shaft mixer, and mobile foundation-free on a trailer chassis [S1][S2][S3][S4]. XCMG's published HZS series sits in the same band, with HZS60VG, HZS90, HZS120VG and HZS180VG models listed at FOB $105k-255k, giving a working price envelope for this output range [S7].
Why a Standard Civil Plant Fails at a WWTP Site
Water-treatment structures — clarifier walls, aeration-tank bases, chemical-room slabs, filter beds — are placed in ground that is almost always wet, and the aggregates delivered to site carry 3-8 % silt and organic fines by mass [S1]. A generic skip-hoist plant without an aggregate washer pushes that contamination straight into the mix water, raising water demand, hurting strength, and pushing permeability above the 10⁻⁹ cm/s range many clarifier designers want [S2].
A second failure mode is moisture drift. Sand moisture can swing from 4 % to 12 % over a single shift; without an inline probe, slump drifts 30-60 mm, which is enough to crack a 300 mm clarifier-wall lift on the next pour [S2]. A PLC with a sand-moisture sensor and automatic water trim is therefore not an option but a baseline for this duty cycle [S1][S2].
Selection Criteria: Mixer Type, Output, Layout, Controls
Three criteria separate a WWTP-suitable plant from a generic one. First, the mixer: an enclosed twin-shaft (JS series) or planetary pan (JN series) with shaft-seal flushing handles wet, sticky aggregate and admixture-charged mixes better than a single-shaft drum; CONMACH and UNIQUE both publish twin-shaft as the default for chemical-resistant and waterproofing mixes [S1][S2]. Second, the layout: a belt-conveyor aggregate feed (rather than skip hoist) gives steadier throughput above 90 m³/h and lower dust at the transfer point, which matters on tight WWTP sites next to live process tanks [S2]. Third, the control layer: a PLC with recipe storage, batch records, and a water meter linked to a concrete admixture dosing port allows the same plant to switch between structural mixes, waterproof mixes, and chemical-resistant mixes without manual re-calibration [S2][S3].
Capacity bands that match real WWTP demand: a 60 m³/h unit covers a 10,000-30,000 m³/d plant's slab and small-tank pours in 8-10 hour shifts; a 90-120 m³/h unit covers 30,000-100,000 m³/d plants with continuous structure work; a 180 m³/h belt-conveyor twin-shaft unit is the right size for the largest municipal upgrades and is also the band where a concrete vibrator fleet of 6-10 pokers is typical for wall and base consolidation [S1][S2][S7].
Stationary vs Mobile: Decision Matrix
For a fixed WWTP site with 12-36 months of structural work, a stationary belt-conveyor twin-shaft plant is the cheapest m³ in the 90-180 m³/h band, with a published FOB range of $130k-260k for the HZS90-HZS180VG class [S7]. For a distributed contract — multiple small tank sites, a 6-12 month programme — a mobile foundation-free plant (typically 60-90 m³/h, with built-in silos on a towable chassis) cuts site-civil cost but caps throughput and aggregate size to 60-80 mm [S1][S5]. Used Erie Strayer MG-12CP-class stationary plants appear in the 2026-07 dealer listings at 30-60 % of new price with full control-retrofit support, which suits municipal procurement on a tight capex [S3][S4].
Four-criteria comparison for a typical WWTP procurement:
• Stationary belt-conveyor twin-shaft (HZS120VG-class): 120 m³/h, twin-shaft JS mixer, FOB ~$200k-230k, best for fixed 12-36 month sites, full PLC recipe control, admixture and concrete admixture dosing ports standard [S2][S7].
• Stationary skip-hoist twin-shaft (HZS60VG-class): 60 m³/h, FOB ~$105k-110k, lower height, fits inside an existing shed, lower dust control, limited to 60 mm aggregate [S7].
• Mobile foundation-free (Haomei-class): 60-90 m³/h, FOB ~$90k-150k, no civil foundation, towable, suits 6-12 month multi-site contracts, lower silo volume limits continuous shift [S1][S5].
• Used/refurbished stationary (Erie MG-12CP-class via dealer): 90-120 m³/h, 30-60 % of new price, retrofit PLC available, lead-time 4-8 weeks versus 12-16 weeks for new [S3][S4].
Aggregate Washing, Dust and Water-Loop Integration
An aggregate washing stage ahead of the weighing hoppers is the single biggest differentiator for WWTP duty, and CONMACH lists it as a standard module on its WWTP-targeted configuration with a sand-recovery-dewatering screen returning under-0.075 mm fines to a settling pond [S2]. Closed-loop water reuse from the settling pond back to the mixer is technically possible but rarely done on containerised or mobile plants because the screen-cloth maintenance and water-metering burden offset the water saving [S2].
Dust at the transfer points is the other recurring WWTP complaint. Enclosed conveyor galleries with sealed transfer chutes, plus a bag-filter on the cement silo vent, keep visible dust below the 10 mg/m³ range most WWTP environmental permits require, and UNIQUE publishes this as a standard build option on its belt-conveyor plants rather than an upgrade [S1]. A concrete vibrator selection matching the wall thickness — 30-50 mm pokers for 200-300 mm walls, 70-90 mm for base slabs — completes the consolidation side; pairing the wrong size with the wrong batch water content is the most common cause of bug-holes on clarifier walls [S2].
Standards, Sourcing and Dealer Network
Two procurement pathways dominate the 2026-07 market. The OEM-direct route through UNIQUE (founded 1983, full engineering scope, China-based export programme) and CONMACH (Turkey-based, ships containerised) handles new builds with full PLC and aggregate-washer scope [S1][S2]. The dealer route through Fonte & Company (Erie Strayer authorised) and REMCON Associates (used and refurbished with control retrofits) handles the North American municipal market, with REMCON listing a 2018 Erie MG-12CP in active inventory and a 1,100 kW twin generator package as a 2026-07 reference configuration [S3][S4].
For buyers benchmarking supplier lists, the Southeast Asia sourcing index on Alibaba flagged 1,676 matching plant-supplier entries in the 2026-07 search, with the top three markets reported as Southeast Asia 47 %, domestic 19 %, Africa 13 % — useful as a price-band signal rather than a quality one [S8]. Cross-checking against a maker map, the most relevant adjacent sourcing reference for the same project is the concrete-pump-truck suppliers 2026 list for placing the wet mix on structure pours, and the batching-plant capacity, mixer and layout levers page for the procurement-decision framework. For trucking the raw aggregate in, the dump-truck sizing and selection guide gives a working axle-and-payload map that pairs cleanly with a 60-180 m³/h plant's feed cycle.
Trackable signals for the next procurement window: (a) lead-time for a new HZS120VG-class plant sits at 12-16 weeks ex-works as of the 2026-07-06 dealer posts [S3][S4][S7]; (b) used Erie MG-12CP-class inventory in North America remained active through the 2026-07-01 listing, with retrofit PLC quoted at 4-8 weeks [S3][S4]; (c) containerised WWTP-targeted plants from CONMACH continued to ship in 40 ft HQ containers with on-site commissioning in 10-15 days, per the 2026-07-08 product post [S2].