RECYCLING SYSTEM FOR DRY WASTE FROM STP

Technical Field

The Recycling system for dry waste from Sewage Treatment Plant (STP) can operate in Omani operation conditions. The proposed system contained but not limited of the following:

- Feeding discharging system of the dry waste (Digestate and loading

conveyor)

- Biological reactors with parameters monitoring and controls electronic panel

- Heat Exchanger

- CHP unit

- Cooling trap

- Bio-Gas storage unit

- Piping system

- Fume filters

- Chiller(s)

- Pumps and compressors

- Water tanks

- Mechanical compressed unit

- Gas treatment Unit

- Feeding system to cement clinker

- wet scrubbers This proposed system will 100% recycle the dry waste and transfer it to energy and other products which gives a sustainable and renewable source of energy.

[0001 ]

Background Art

The current methods of dealing with the dry wastes form sewage treatment plant (STP) are:

1) Taking to the Land filled

2) Burning

3) Compost to Fertilizer

4) In some cases un treated disposal

5) Used Bio gas production

Summary of Invention

The Recycling system for dry waste from Sewage Treatment Plant (STP) can operate in GCC operation conditions. The system will work in the principals of 100 % recycling from dry wastes (from STPs) to useful products with value e.g. biogas and cement, by combining, anaerobic degasification (AD) process and cooking with lime stone.

Technical Problem

The problems with published methods of dealing with the dry wastes form sewage treatment plant (STP) are:

Solution to Problem

The new invention gives a comprehensive solution and will fix the issues mentioned in the old art. The new invention will offer:

- 100% recycling means no lift over will go to the land filled

- Will address the issue with the heavy metals and high level of antibiotics

- Will Address The issue of Biological hazards (i.e. parasite, scares ,..etc)

- Will generate an economic value by producing energy and saving energy consumption. - Will prevent some of the environmental issues (i.e. underground pollution)

Detailed Description

The Recycling system for dry waste from Sewage Treatment Plant (STP) can operate in Omani operation conditions. The system will work in series as following:

- The dray waste will be delivered from the STP to the bio-gas plant.

- In the bio-gas plant the dray waste will be fed to biological reactors where Methane gas (CPU) will be produced from the reactors. The reaction time is 72 hours /cycle (reaction cycle is from the time the reactor fed until the

discharge).

- From the reactor will expect two types of products : 1) methane gas which will go to treatment unit for purification and upgrade and 2) digested slurry which will go to mechanical shaping unit.

- The methane (which is the first product from the reactor) will go after the treatment unit to biogas storage unit then to CHP electricity generators to generate electricity which is sold to end user.

- The digested slurry (the second product from the reactors) will be

transported to a cement plant after coming out of the mechanical shaper.

- The cement plant will have a feeding system to feed the digested slurry to the clinker where the slurry will be cooked with the limestone in 1400C ⁵ . This process will reduce the amount of gas needed to heat up the clinker which will introduce energy saving to the cement plant. Also cooking the slurry with the limestone will reduce the amount of NOX's gases produced from normal cement production. Also, in the cement plant the proposed system will integrate wet scrubbers into the cement production system to remove any dust from exhaust gases.

The proposed system contained but not limited of the following: * Feeding discharging system of the dry waste (Digestate and loading conveyor)

This conveyor system will be customized to feed the reactor and to carry-out the Digestate from the reactor. The conveyors will is automated to operate in harmony with the reactor feeding and discharging gates. Also, conveyors are fully controlled by the main control panel.

* Biological reactors with parameters monitoring and controls electronic panel

These reactors are mainly off shelf with some modifications to suit the operation conditions in Oman and to integrate with the automation feeding and discharging system as well as the parameters controls (i.e temperature, pressure, humidity controls, etc).

* Heat Exchanger

This a standard heat exchanges for heat control of the reaction

* CHP unit

Standard CHP generators for electricity production of 8.5 Mw/day

* Cooling trap Standard cooling trap

* Bio-Gas storage unit

Standard spherical shape bio-gas storage tanks with attached valves and control panel connection.

* Piping system

This system is to connect the system together and built based on the standards and specifications given in Oman

* Fume filters. Standard filters to prevent any harmful fumes to go to the atmosphere

* Chiller(s)

Standard chillers for cooling purposes of the system in case of overheating

* Pumps and compressors

To provide the mechanical driving forces for the material movement

* Water tanks

For water storage for the usage for humidity control

* Mechanical compressed unit

This modified mechanical shaping units to shape the digested slurry to be suitable for the feeding system of the cement plant.

* Gas treatment Unit

This is a standard treatment unit to purify and upgrade the methane gas to be used in the CHP generators and to remove any harmful gases.

* Feeding system to cement clinker

Standard feeding system for cement plant

* Wet scrubbers

Is a standard wet scrubber to remove any dust from the exhaust gas from the cement clinker

This proposed system will 100% recycle the dry waste and transfer it to energy and other products which gives a sustainable and renewable source of energy. Also, it will address the issues with old arts.

Description of Drawings

Fig.1

Overview of the process flow Fig.2

1 &3 -Feeding discharging system of the dry waste (Digestate and loading conveyor) 2-Biological reactors with parameters monitoring and controls electronic panel

9- To present Heat Exchanger

6- Cooling trap

5- Bio-Gas storage unit

4- Piping system

7- Mechanical compressed unit

5- Gas treatment Unit

10- Feeding system to cement clinker

11- Wet scrubbers