Primary energy is combined by various conversion methods in the combined cooling, heating and power (CCHP) system, which can directly provide electricity to water chillers, heating systems, steam generators and other terminal energy services systems for users in an economical and efficient manner. The energy can be integrated and optimized with cold, heat and electricity production technologies.
The energy efficiency is up to 80%;
Clean energy and sustainable, without extra contamination;
System capacity is flexible with good economics.
Flow Diagram of Energy Cascade Utilization
As a result of China's electrical market reform and policies to promote combined cooling, heating and power (CCHP), SafBon has completed numerous distributed energy projects that can meet the increasing demand of various clients. These projects provide industrial parks, commercial buildings, and other industrial and commercial customers with comprehensive energy solutions via CCHP.
The CCHP station technology is applied in:
Hotels, hospitals and other building types;
Area types of natural gas distributed energy projects;
Biomass gas distributed energy projects;
Industrial waste gas distributed energy projects.
Containerized Desalination Technology
Modular seawater desalination system is an integrated, compact and convenient desalination product. It is composed of seawater pretreatment, seawater pressurization and reverse osmosis (RO) desalination, reprocessing, and chemical cleaning. The product capacity is 50-500 t/d and is a SafBon solution for smaller desalination systems compared to the larger desalination systems SafBon offers.
Desalination Integrated in Containers
Suitable Waters for Application
Drinking water supply off the coast;
Ship & yacht water supply;
Offshore drilling platform for water supply;
Island development and construction of water;
Water for emergency and disaster relief.
Convenient for storage and transportation;
Small footprint and investment;
Efficient with high recovery rates.
At present, the main demineralized water treatment processes are ion exchange and separation membrane. The demineralized water treatment process design is normally based on different influent qualities and effluent quality requirements. A proposal based on specific characteristics of the raw water is the most cost-effective one. It ensures the treated water quality always reaches the effluent requirements.
Membrane technology is one of the most advanced and common water treatment technologies in the world for water purification. SafBon is highly experienced and skilled in applying ultrafiltration (UF), reverse osmosis (RO) and electrode ionization (EDI) technologies in water and wastewater treatment process, depending on the customer requirements and surrounding specifications.
UF Technical Advantages
The effluent quality is stable;
The Silting Density Index (SDI) reaches the requirements of RO inlet water;
The operation has low energy consumption and pressure;
It can remove colloidal silicon effectively;
The remove rate of bacteria and virus is more than 99%;
The floor space is less and the automation level is higher.
RO Technical Advantages
The key equipments, such as membrane, pressure vessel, and high-pressure pump are high quality products;
High recovery rate;
Stable water production;
Convenient and easy operation;
High automation level.
SafBon’s EDI technology plays a leading role in the China’s “Electrode Ionization Equipment for Pure-Water Preparation” national standard development process. A foreign module processing unit is introduced to prepare the electric deionized water, which is a demineralizing technology that combines ion exchange and an electro dialysis membrane to remove the ions in the water.
EDI Technical feature
The effluent quality is high and stable;
The demineralizing efficiency reaches 99%. The operation is convenient, safe, and with a high automation level;
No chemical agents are required to regenerate the resin;
The system is not limited by resin regeneration, and will not produce acid or alkali wastewater. It can be designed to be stackable with a smaller footprint.
Ion Exchange Technology
Ion exchange is a technology which selectively adsorbs or releases specific ions with the force difference between ion exchange and solution. It results in the removal of impurities, enrichment or purification of the target biochemical substances.
SafBon provides the ion exchange technology proposals for water treatment. For instant, the mixed-bed polisher system for boiler makeup treatment, the weak acid cation polisher system for coal chemical industrial circulating cooling water treatment.
The BIOBON is a multi-stage activated sludge process, which integrates biological nitrogen, phosphate and carbonate removal, final clarification and a subsequent advanced water treatment in the same basin. The biological moving aerator chains are the essential part of BIOBON process, which guarantees the sufficient and economical oxygen supply, so that an odorless activated sludge process achieves.
It replaces concrete tank with non-concrete tank with HDPE membrane (high density polyethylene impermeable membrane), which greatly decreases construction costs;
The fine air bubbles produced by undulating aerator chains remain in the water almost three times longer than with fixed aerators, oxygen transfer efficiency is thereby improved and up to 20% energy is saved.
It has high sludge content as well as longer aeration and sludge retention times, which decreases the cost of subsequent sludge dewatering.
The simple structure and easy installation make BIOBON an ideal sewage treatment method for certain kinds of municipal wastewater treatment plant (WWTP) projects.
BIOBON provides an extra excellent solution for the treatment of ammonia nitrogen, BOD, COD, TP (total phosphorus) and other pollutants in the municipal sewage. This treated wastewater can be directly reused as industrial cooling water. In China, SafBon is leading in the application of the biological filter and the BIOBON aeration treatment technology into the sewage and reclaimed water treatment systems.
Generally, the flue gas desulfurization (FGD) wastewater refers to the discharged water from the gypsum dewatering system and cleaning system, and the overflow water of wastewater cyclone. The wastewater quality is influenced by various factors in the power generation process. For instance, the purity of coal used, the operating conditions of the power plant, the quality of desulfurization process, and the purity of limestone. The FGD wastewater characterized as high turbidity, high hardness and high COD coupled with large variations in water quality and quantity. Thus, the FGD wastewater treatment is quite complicated but nonetheless important.
Typical Processes of FGD Wastewater Treatment
In order to overcome the FGD treatment dilemma, which mainly caused by the FGD wastewater complex features, SafBon cooperated with institute of power plant chemistry at Wuhan University established an associated lab focusing on the development of FGD wastewater zero discharge technology development for industry. The cooperation resulted in the development of an innovative system which integrates and consists of a new technology developing phase, a pilot-scale testing phase, a pilot exercise phase and a talent cultivating phase. Not only can this new lab facilitate the research and development of strategic frontier technologies, it can also contribute to the testing and development of feasible technical solutions for the clients in wastewater management.
FGD Wastewater Treatment
As shown in the flow diagram (Fig. Typical processes of FGD wastewater treatment), there are generally three steps in an FGD wastewater treatment process: pre-treatment, evaporation and crystallization. There are a number of treatment approach options that SafBon provides, such as physicochemical methods, electrochemical methods, biological methods and spray drying methods.
In order to respond the low environmental impact requirements, the FGD wastewater treatment process has been improved. When a certain degree of pre-concentration is achieved, the wastewater is evaporated and crystallized in the forced circulation system. With additional reverse osmosis, evaporation and crystallization processes, the FGD wastewater treatment by SafBon is able to achieve the zero liquid discharge (ZLD) requirement.
NG Regulator Station
SafBon’s natural gas (NG) regulator station can be divided into the boosting station and the reducing station with a carefully designed system device to boost and reduce the pressure of fuel gas in the pipes of the fuel gas network. It is a highly integrated system which incorporates clean filtering, boosting, reducing, metering, temperature control, leaking, alarming and data acquisition monitoring for fuel gas. It is used to condition and control the pressure, temperature, and flow of the natural gas while cleaning and filtering the stabilized fuel provided to customers and gas equipment which requires such fuel.
Pressure Reducing Valves Operational Schematic
The system shall be designed for the following requirements:
Supply of fuel gas (natural gas) to two gas turbines at sufficient flow, quality and pressure.
Separation of dust and fluid impurities from the fuel gas by the first filtering stage.
Measurement of flow rate and gas composition for calorific value calculations.
Preheating of the fuel gas to avoid the formation of condensates at the pressure reduction stage and in the transfer pipeline to gas turbines, in an indirect heater.
Reduction of pressure at the pressure regulating station.
Recording of the fuel gas consumption of each gas turbine by a turbine meter individually at each gas turbine.
Protection of the gas turbines by final filters.
Protection of the system from over pressure.
Monitoring for gas leakage.
The NG regulator station consists of the following thirteen main parts:
Unit 1 Emergency stop valve at the inlet to the gas system
Unit 2 Knock out drum and filter
Unit 3 Orifice meter
Unit 4 Gas pressure regulator station
Unit 5 Fuel gas compressors
Unit 6 Fuel gas heater
Unit 7 Outlet safety cut-off
Unit 8 Condensate collection and disposal system
Unit 9 Nitrogen purging system
Unit 10 Instrument control instructions
Unit 11 Relief piping system
Unit 12 Surface treatment and paint
Unit 13 Leakage detection and fire warning & control system
The NG regulator station technology is mainly applied in:
CCPP(Combined Cycle Power Plants);
Power plants that use nature gas as fuel;
The industries that use natural gas as fuel;
Gas fired boilers;
CCHP(combined cooling, heating and power systems);
City gas and natural gas transmission pipelines.
Precoat Filtration Technology
Precoat filtration is a new technology developed by SafBon. There are mainly two types – pressure type and submerged type. Fundamentally, this technology is able to line the surfaces of filter elements by hydraulic methods with either a powdery diatomite or activated carbon. The resulting filter membrane thickness is 1.5-3.0 mm, which rejects suspended particles and other microorganisms in water. With the utilization of this precoat treatment technology, the filtered water meets the requirement of China’s "Drinking Water Health Standards" (GB 5749-2006).
Submerged Precoat Filtration Technology
The negative pressure filtration can conveniently match the existing water supply system;
The filtration rating is 1 μm; the effluent turbidity < 0.1 NTU; the bacteria removal rate > 6 Log; the COD removal rate > 50%, the chromaticity removal rate > 90%; the algae removal rate > 90 %, the filter operation time > 15 hours. The effluent quality meets the latest China’s national drinking water standards.
The precoat filter occupies 1/3 footprint of conventional filter. Besides, the precoat filtration technology requires less investment; the filter is reliable, durable, less operating costs. Thus this technology is one of the best choices in water plant upgrade process.
Less operational power consumption; the transmembrane pressure difference is less than 0.05 MPa.
The precoat filtration technology mainly can be applied in:
Drinking water treatment and drinking water advanced treatment;
The industrial wastewater in beverage industry, beer industry, etc.;
The industry that produces special wastewater, such as dye sewage and oilfield sewage;
Sewage advanced treatment.
Low Impact Development (LID) Concept
Low impact development (LID) refers adopting an ecological approach when treating water in a sustainable way. A city should be able to store and recycle the stormwater, while reducing the pollution in the initial rainwater runoff. Furthermore, the city should be flexible in adapting to environmental changes, responding to natural disasters and other incidents.
Riverside Construction of LID Project in Liupanshui, China Overview of Liupanshui China LID Project
SafBon is committed to putting the ecological environment first and during the construction of projects combines the natural views and artificial landscapes. The goal is to maximize the holding, infiltration and purification of rainwater in the city area, in the premise of city water drainage system safety.
SafBon fully takes natural precipitation, surface water and groundwater system into consideration when designing water supply, drainage and reuse system. Artificial landscapes such as walking and bicycle lanes along the river, wetland park, etc. are constructed for the comprehensive development of the cities and allow the residents to enjoy the environment.
SafBon is well-known for its effective design, rigorous construction and state-of-the-art technologies. SafBon also has professional financing and engineering teams, advanced water treatment technology teams coupled with excellent equipment, standardized management and construction in a systematic manner. They all support the SafBon’s success in LID projects.
Zero liquid discharge (ZLD) refers to a process which minimizes the pollutant emission and discharge until no liquid is released back into the environment. It follows the concepts of cleaner production, 3Rs (reduction, reuse and recycling) and eco-industry to maximum the use of natural resources without discharging any waste to environment. The promotion of ZLD process is not only beneficial to the ecosystem, but also good for industries and the government.
Multi Effect Distillation (MED) for evaporation Crystallizer
For different types of industrial wastewaters, the appropriate technologies will be employed to achieve ZLD requirements. In general, there are membrane separation, thermal evaporation and crystallization process.
Some sample ZLD processes are shown below:
Multi-effect evaporation and crystallization
The condensate is recycled to the circulating cooling water system, and the crystallized salt is dried as industrial raw material;
Reverse osmosis - evaporation crystallization
Recycling clean water by reverse osmosis desalination , and the concentrated wastewater is crystallized in evaporation crystallizer;
Reverse osmosis - forward osmosis - evaporation crystallization
Flue gas desulfurization (FGD) wastewater is concentrated by reverse osmosis and forward osmosis methods, and the condensate and salt are respectively collected by evaporation crystallization treatment.
With SafBon ZLD processes that best suits our customers’ needs, most of the water can be recycled as cooling water, boiler make-up water and for other industrial uses. The solid salts can be landfilled or used as the raw material in chemical industry.
Typical Processes of Mechanical Vapor Compression (MVR) Evaporation Crystallization
SafBon can provide the natural gas long-distance pipeline investment as well as the services of its construction and operation. In order to develop the natural gas long-distance pipeline and city gas pipeline network in both construction and operation, SafBon has improved its ability in carrying out the project construction from upstream to downstream industries.
The gas transmission lines from the neighboring cities.
The gas transmission lines from the oil and gas gathering station.
The gas transmission lines from the coal gas plant gas gathering station.
The gas transmission lines from artificial gas plants, coking plants, petrochemical plants.
Sewage Treatment Process
Sewage treatment can be classified as primary treatment, secondary treatment and tertiary treatment according to the extent of treatment. The suspended solids in wastewater are mainly removed in the primary treatment which usually uses physical methods. In the secondary treatment process, CODCr, BOD5, NH3-N (ammonia nitrogen), TN (total nitrogen), TP (total phosphorus) and SS (suspended solids) are substantially removed. The BOD5 removal rate is 80% ~ 90%.
The commonly used technologies in the sewage treatment process are
Adsorption Biodegradation (AB) process;
Anoxic/Oxic (A/O) process;
Anaerobic-Anoxic-Oxic (A2/O) process;
Sequencing batch reactor (SBR);
Modified sequencing batch reactor (MSBR);
Intermittent cycle extended aeration (ICEAS);
Cyclic activated sludge system (CASS);
Membrane bio-reactor (MBR);
Aerated grit tank;
Horizontal flow sedimentation tank;
Mechanical accelerated clarification tank.
The purpose of tertiary treatment is to further remove some particular pollutants, such as phosphorus and suspended solids, requires an advanced treatment and commonly uses chemical methods.
SafBon Design Principles
The following principles are followed during the design of the sewage treatment plant:
Comply with the relevant laws, regulations and standards and under the guidelines of the overall planning; coordinate the project construction and the city development; utilize local conditions and wastewater facilities to improve local environment and enhance the water quality which will result in maximizing the social, economic and environmental benefit of project.
Depending on the characteristics of the influent water quality of each project, the environmental capacity and status of the receiving waters, each wastewater treatment process has to be combined effectively after consideration of the technical and economic effects. Low energy consumption, easy operation and smaller footprint are goals which SafBon will strive to achieve.
Residual sludge produced will be handling properly to avoid secondary pollution.
Depending on the different characteristics and scale of projects, SafBon keep the principle of “financing first, excellent institutions, professional team, advanced science and technology, well-equipped, normal management , scientific construction, relationship coordination, environment protection, safe security, guarantee project period” on the construction of sewage treatment plant.
In the oily water treatment process, oil-water separators and floating oil collectors are the most commonly used equipment. SafBon oil-water separator design adheres to guidelines mentioned below:
The separator inlet water-distribution installation should allow the water flow to stay in the laminar flow state (Renold’s number < 500). Under this condition, the oil droplets can steadily float upwards.
The inlet and outlet water-distribution installations should distribute the water evenly. When water flow through the aggregating filter, its surface area should be fully used to prevent short flow from occurring.
According to the American API-421 standard, the designed water flow horizontal velocity should either be below 55 m/h, or lower than 15 times the velocity of an oil droplet rising velocity (the smallest is chosen).
Cross-Fluid Corrugated Plate
Additionally, in order to meet the requirements from different customers, SafBon provides dissolved air floatation (DAF) technology, biological purification and ultrafiltration membrane (UF) technology, for further or enhanced treatment.
The Structure Diagram of Oil-Water Separator
SafBon oil-water separators have been widely applied in various industries throughout China like Hunan Valin LY steel (1500 t/h) project, Wuhan Wisco (1260 t/h) project and Gujiao power plant (500 t/h x 2) project. The total processing capacity in China s up to 50,000 t/h.