400–500 KG/H Sewage Sludge Belt Dryer in Poland

Size the Dryer Around Water Evaporation

Wet sludge intake, evaporated water and dried product are different quantities. At the calculation point of 78% inlet moisture and 22% outlet moisture, every 500 kg of cake contains 110 kg of dry solids. Preserving those solids gives approximately 141 kg of dried material and requires removal of 359 kg of water.

These calculations assume negligible solids loss. At 80% inlet moisture and the same feed rate and discharge target, evaporation rises to approximately 372 kg/h. The equipment assessment therefore needs to cover wetter cake, rather than relying on one favourable sample.

Each scheduled production day handles 8 tonnes of wet cake. A buffer between the centrifuges and dryer must accommodate intermittent dewatering output, while level controls prevent surges onto the belt. Storage and bypass arrangements should allow centrifuge operation to continue during planned dryer cleaning. This interface matters because wastewater treatment must remain available when the drying equipment stops.

QHG-1000: A Platform for Sludge Testing

The QHG-1000 steam-heated belt dryer is the candidate platform for this assessment. Its general configuration includes five mesh-belt layers, a 1.2 m belt width and 43 m² of drying area. The listed electrical configuration is three 2.2 kW motors plus one 1.5 kW motor, totalling 8.1 kW. Feeding, exhaust treatment and other project auxiliaries require separate load calculations.

Drying area alone does not establish sewage sludge capacity. Selection depends on measured evaporation, airflow resistance, belt release and cleaning performance with representative sludge. Material compatibility, seals and accessible cleaning points also need review for sludge service. The proposed wet-feed rate remains a design target until trials establish the operating envelope.

Prepare the Cake Without Buying a Pellet Production Line

Centrifuge cake can form dense lumps that restrict airflow. A metering screw and sludge-specific forming head can distribute strands across the belt, increasing exposed surface and leaving air passages. This is wet-cake preparation, not a separate commercial pellet production process.

The forming arrangement must be tested against the cake’s consistency and polymer conditioning. Some sludge may need dried-material backmixing to pass through its sticky phase; other cake may spread adequately without it. Backmixing increases internal circulating load and must be included in equipment sizing.

Strand diameter, bed depth and belt speed are established together during trials. Prescribing a universal strand size or residence time would overlook changes in solids content, ash and stickiness. The practical objective is a permeable bed that dries evenly and releases reliably.

Use Available Steam Without Overlooking Winter Demand

The site scenario includes a biogas-fired boiler supporting digester heating. A steam-heated sludge dryer could use this infrastructure, provided the boiler has sufficient spare capacity during winter. Steam already committed to digestion is unavailable for drying.

The utility review covers pressure at the dryer connection, sustained flow, steam quality, control valves, traps and condensate return. Steam consumption must come from the heat balance and material trials. Fan electricity, boiler operation, maintenance and any competing use for biogas remain operating costs.

A temperature-controlled heat exchanger supplies drying air without injecting steam into the sludge. Feed regulation and belt speed should respond to measured discharge moisture, with laboratory checks used to verify the control readings.

Connect Exhaust Treatment and Discharge Storage

Warm, humid exhaust creates a separate treatment duty. Enclosure under controlled negative pressure helps contain emissions, but an existing biofilter cannot automatically accept the additional airflow, heat and ammonia load. Exhaust cooling, condensation or scrubbing may be needed before biological treatment. Collected liquids return through an agreed treatment connection.

Dried sludge also requires controlled discharge and suitable storage. Cooling, dust capture, housekeeping and protection against overheating are part of the integration assessment. Fire and explosion protection must follow the material assessment and applicable requirements; a low drying temperature alone does not eliminate these risks.

Match the Moisture Target to the Receiving Facility

The 20–25% outlet-moisture range is a proposed target for evaluating transfer to an authorised thermal-treatment or co-processing facility. The receiving operator must accept the material’s moisture, calorific value, ash, contaminants and handling characteristics. Drying does not guarantee acceptance or a positive selling price.

Agricultural use requires a separate assessment of treatment, pathogens, metals, soil conditions and application requirements. Lower moisture alone does not establish suitability. For this Polish sludge drying project, the commercial evaluation therefore follows an agreed receiving route rather than assuming fertiliser sales.

Acceptance Should Measure the Whole Drying Duty

The acceptance plan should record wet-feed mass, inlet and outlet moisture, operating hours, steam draw, electrical consumption and recovered dried material over sustained operation. Checks across the discharged material help identify wet pockets. Cleaning trials should establish access, wash-water demand, drainage and restart procedures.

The staffing plan needs supervision across both operating shifts, together with time for sampling, inspection and cleaning. Maintenance and laboratory support remain separate responsibilities. The quotation should distinguish the dryer from the wet-cake feeder, exhaust treatment, discharge cooling and site works, so the operator can compare the installed scope and operating duties.

Site installation needs confirmed support loads, maintenance clearance, lifting access and electrical interfaces. Qingdao–Gdańsk followed by road transport is a possible shipping arrangement; packing and container requirements depend on the final assembly dimensions.

At the calculation point, drying reduces outbound material from 2,000 to approximately 564 tonnes annually. This is a calculated mass reduction, not an equivalent saving in transport costs. Actual value depends on haulage contracts, receiving fees and the full operating cost.

To evaluate a sewage sludge belt dryer in Poland, send RICHI Machinery representative cake data, daily sludge tonnage, seasonal moisture results, available steam conditions, the receiving facility’s specification and a site layout. These inputs support a material trial, an evaporation-based selection and a quotation defining the dryer and its required interfaces.