Sludge Screening, Sorting and Recycling Plant.
The Problem
Rag and grit are major problems in wastewater sludges causing
blockages, wear and inefficiencies throughout the wastewater
treatment works. When sludges are used in downstream processes such
as anaerobic digestion, rag and grit cause even greater problems.
These problems include but aren’t limited to reduced tank capacity,
further wear on dewatering centrifuges, and a significant reduction
in biogas yield as a result of lost digester volume and increased
downtime when maintaining and cleaning digester vessels. The first
stage of sewage treatment in a wastewater treatment works is the
removal of rag and grit from the energy bearing liquid effluent.
The Solution
Originally screening took place in order to protect downstream
assets from blockage and wear. With the advent of energy generation
from sludge, the protection of these valuable assets has never been
so important. Our S: HENGYANG screening technology successfully
removes both grit and rag from sewage sludges, sewage screenings
and tank cleaning residues, creating segregated, washed stockpiles
of grit and rag for reuse or disposal.
These solutions bring the following benefits to the sludge
screening process:
Elimination of blockages- The screen’s simple design means that
whatever type of material is pumped onto the screen, it will
process it. There is nowhere for rag to block within the screening
system.
High processing rate- Due to high-frequency vibrations, our screens
can operate up to 77L/s at a dry solids content of 6% and can
comfortably work on high thickness sludge. The result is that our
screens can process directly from inter-site tankers, avoiding the
need for buffer storage tanks.
High screenings retention rate- The screening size (i.e. the
separation size) can be easily modified depending on the
application in which it is being used. The vigorous nature of the
screen ensures it is virtually impossible for particles larger than
the screening size to pass through the screen.
The Result
With our S: HENGYANG sludge screening solution, our customers are now sending 50%
less waste to landfill than was previously the case.
We are also recovering a range of materials from the waste and
converting them into commercial products which have uses in a
variety of applications.
Reduce downtime and maintenance requirements
Hengyang alloy tank capacity and improve biogas yield
Reduce transport and disposal costs
Reduce waste sent to landfill
Produce high quality sludge for use in biosolids applications and
energy generation processes
