With a groundbreaking cutting system, Zenit’s Grey CTG pumps are a revolution in high-concentration organic wastewater management.
Content provided by Zenit Group Corporate Marketing Department
The handling of high-concentration organic wastewater, often saturated with solids and tough fibrous materials, has long been a significant challenge for both municipal and industrial operators. Zenit Group addresses this head-on with the introduction of the Grey CTG submersible pumps, a series that marks a technological shift in the field.
Inside Grey CTG
The specific development of the CTG was driven by the necessity to transcend the inherent flaws of conventional cutting pumps, which frequently struggle with diverse solid compositions and overly restricted internal passages. By utilizing state-of-the-art hydraulic units, the CTG series manages to offer flow rates and free passage dimensions that are typically only seen in channel or vortex pumps, yet with the added advantage of a shredding system that prevents filamentary waste from compromising the operation.
At the heart of these machines lies the pioneering Zenit new cutting system, a sophisticated mechanical marriage between a channel impeller equipped with sharp-edged blades and a fixed blade integrated directly onto the suction flange. This unique configuration generates a highly effective scissor-like action designed to grind through the most stubborn solid and fibrous waste before it can clog the hydraulic unit.
CTG pumps complete the Grey series, now equipped with application-specific hydraulic units: the vortex-based DGG, the wide-channel DRG, the multi-channel GRG with its rotary knife, and the high-pressure APG models.
The System
The operational effectiveness of this system is matched by its design simplicity and ease of maintenance. The impeller blades are strategically screwed along the hub to ensure that all solid waste is actively conveyed toward the fixed blade on the suction flange, effectively preventing any material from tangling around the impeller hub and clogging the unit. Maintenance crews will find the system remarkably user-friendly, as the critical clearance between the blade and the impeller can be precisely adjusted using cellulose fibre gaskets positioned between the flange and the pump body. This ensures the pump can be kept at peak performance levels with minimal downtime.
Regarding construction, Zenit has selected high-quality materials to guarantee long-term durability under heavy-duty conditions. While the main body is cast from EN-GJL250 iron, the crucial components of the cutting mechanism—including the impeller, suction flange, and the blade itself—are manufactured from GJS-600 spheroidal cast iron. This material choice is vital because it offers the structural strength of steel combined with the ductility of cast iron, providing the necessary resilience against the impacts and friction that define demanding industrial applications.
These units are powered by robust 50 Hz three-phase motors with power ratings ranging from 2.2 to 15 kW, providing the versatility needed for any application, from residential projects to large-scale industrial plants. Reliability is further bolstered by the inclusion of dual silicon carbide [SiC-SiC] mechanical seals as standard equipment, which are protected within a serviceable oil chamber to ensure they never come into direct contact with the abrasive or fibrous waste in the water. Furthermore, the wide free passages and outlet diameters from DN80 to DN100 ensure that hydraulic performance and efficiency remain well above the industry average. Safety features are equally comprehensive, including built-in thermal protections in the stator and a thick 200 µm coating of two-component epoxy paint for superior corrosion resistance.
Specialized in the Most Demanding Applications
The entire range is available with ATEX certification for use in potentially explosive atmospheres. This makes Grey CTG an invaluable asset across a wide spectrum of industries. In the textile and paper sectors, it effortlessly handles industrial water filled with filaments, while municipal and emergency services can rely on it for disposing of complex water and waste mixtures in urban or alluvial flood contexts. Additionally, it proves essential in the food and agricultural industries for the treatment of highly concentrated process water and livestock waste.
Grey CTG represents the ultimate solution for efficient and blockage-free management and handling of wastewater with the highest organic concentration.
