Sewage Lifting Plant Integrated Liquid Collection Tank

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Solution Overview

Problem

Existing sewage lifting plants face inefficiencies in long-term operation and cost, with conventional designs requiring separate installation of liquid collection tanks and pumps, leading to restricted installation space and potential structural instability under dynamic loads.

Innovation Solution

A sewage lifting plant design where the liquid collection tank partially covers the sewage shaft floor, allowing for additional installation space for pumps and maintenance access, with a removable cover and integrated components, and using a combination of materials like concrete and plastic for enhanced stability and cost-effectiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the liquid collection tank is designed as a separate component installed in the sewage shaft, then installation flexibility is improved, but installation space is restricted and structural stability under dynamic loads deteriorates

Engineering Contradiction:

Improveinstallation flexibilityVSAvoidstructural stability

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The liquid collection tank is merged with the sewage shaft by making the tank wall coincide with the shaft wall, creating an integrated structure that provides both installation flexibility and structural stability under dynamic loads

Inventive Principle:

Principle #5Merging (Combining)

2Volume of stationary object

If the liquid collection tank completely covers the sewage shaft floor, then storage capacity is improved, but installation space for pumps and maintenance access deteriorates

Engineering Contradiction:

Improvestorage capacityVSAvoidinstallation space

Core Design Contradiction:

Volume of stationary objectVSEase of operation

Solution Approach 1:

The floor coverage is segmented such that the liquid collection tank partially covers the sewage shaft floor, creating distinct zones for storage and for pump installation/maintenance access

Inventive Principle:

Principle #1Segmentation

3Strength

If concrete material is used for the sewage shaft, then structural stability is improved, but production cost deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidproduction cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

Different material qualities are applied locally: concrete is used for the sewage shaft requiring structural stability, while plastic is used for the liquid collection tank where lower structural requirements allow cost reduction

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3058145B1Sewage pumping station

Publication Date: 2020.07.15 KSB SE & CO KGAA

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AI summary

The subject of the present invention is a wastewater-lifting system (1) which is equipped with at least one bulky-material-collecting vessel (2) for wastewater which is guided therethrough and loaded with bulky materials, also with a liquid-collecting vessel (3) for the wastewater which is freed from bulky materials and precleaned in the bulky-material-collecting vessel (2), and with a wastewater shaft (8) for accommodating the bulky-material-collecting vessel (2) and the liquid-collecting vessel (3). The liquid-collecting vessel (3) and the wastewater shaft (8) have at least one common wall surface (9, 10). According to the invention, the liquid-collecting vessel (3) defines a closed-off space with only a partially covered base surface (9) in the wastewater shaft (8) and is equipped for this purpose with at least one wall surface (11, 12) independent of the wastewater shaft (8).