Ethylene & Petrochemical Wastewater Treatment
Ethylene and petrochemical spent-caustic wastewater treatment with documented capacity, influent, operating and treated-water ranges.
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Representative Wastewater Challenges
China Bente supports integrated treatment of high-COD, oily, saline and difficult industrial wastewater. Priority support includes ethylene and petrochemical wastewater with coordinated pretreatment, biological treatment, advanced treatment, water reuse, sludge and off-gas control.
These categories are representative engineering challenges, not a limit on the industries or streams that can be evaluated.
Petrochemical & Refinery Wastewater
Refinery and petrochemical wastewater engineering with stream segregation, oil recovery, sulfide control, capacity references and residue interfaces.
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Chemical & Pharmaceutical Wastewater
Engineering treatment for complex organics, solvents, apis, toxicity and batch-to-batch variation.
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Electroplating & Metal-Finishing Wastewater
Electroplating and metal-finishing wastewater treatment with source segregation, chromium/cyanide control, metal precipitation, polishing and sludge dewatering.
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Heavy-Metal Wastewater
Engineering treatment for dissolved metals, complexing agents, variable ph and hazardous metal-bearing sludge.
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High-COD Industrial Wastewater
Engineering treatment for concentrated organics, variable biodegradability and possible inhibitory compounds.
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High-Salinity / High-TDS Wastewater
Engineering treatment for osmotic stress, scaling, corrosion and difficult concentrate management.
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Industrial Water Reuse & Advanced Treatment
Engineering treatment for residual cod, suspended solids, nutrients, pathogens and reuse-specific contaminants.
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Landfill Leachate Treatment
Engineering treatment for ammonia, refractory cod, color, salinity and age-dependent variability.
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Mining & Mineral Processing Wastewater
Engineering treatment for suspended mineral solids, acidity/alkalinity, metals, reagents and variable mine water.
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Oily Wastewater & Emulsion Treatment
Oily and emulsified industrial wastewater treatment with separated free-oil recovery, emulsion breaking, DAF, polishing and sludge-management duties.
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Poultry & Livestock Farm Wastewater Treatment EPC | China Bente
Engineering treatment for high biodegradable cod, fats, proteins, suspended solids and nutrient loads.
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Pulp & Paper Wastewater
Engineering treatment for fibers, suspended solids, color, lignin compounds and high organic load.
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RO Concentrate / Brine Management
Engineering treatment for concentrated salts, scaling species, refractory organics and uncertain disposal outlet.
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Textile Dyeing & Printing Wastewater
Engineering treatment for color, dyes, sizing agents, surfactants, salts and variable ph.
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Zero Liquid Discharge / MEE / Crystallization
Engineering treatment for high dissolved solids, scaling, heat-transfer limits and variable salt chemistry.
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Special Environmental & Difficult Wastewater
Special environmental and difficult industrial wastewater requires treatment designed from the actual feed and the required outlet, reuse or discharge target. China Bente integrates characterization, process selection, pretreatment, oxidation, separation, biological or physicochemical treatment, membranes, residue handling and plant controls.
Engineering basis
There is no universal treatment train. Feed composition, variability, toxicity, salinity, oil, sulphide, COD and TOC, suspended solids, temperature and the required final water quality must determine the process sequence and safeguards.
Development-stage reference
Saudi Ethylene Spent Caustic / Industrial Wastewater Treatment — In Development. This is a development-stage engineering reference and is not described as completed.
Frequently asked questions
What makes industrial wastewater difficult to treat?
High or variable COD and TOC, sulphide, oil, salinity, toxicity, refractory compounds, temperature, solids and biological inhibition can make conventional treatment unreliable.
Is there one standard treatment train for difficult wastewater?
No. The train must be derived from representative feed ranges, variability, treatability evidence and the required reuse or discharge target.
Which analyses are needed before process selection?
Typical data include flow, COD, TOC, BOD, sulphide, oil, TDS, TSS, pH, alkalinity, metals, temperature, toxicity and process chemicals.
How should variable or batch discharges be managed?
Segregation, equalization, controlled transfer, monitoring and upset storage may be required before downstream treatment.
How is spent caustic wastewater treated?
Treatment depends on sulphide, alkalinity, organics, salts and safety constraints and may include controlled oxidation, separation and polishing.
How are oil and suspended solids removed?
Gravity separation, coalescing, flotation, coagulation, clarification and filtration are selected according to oil form and particle behavior.
When are advanced oxidation processes appropriate?
AOP may be evaluated for refractory organics or toxicity reduction after testing confirms performance, reagent demand and by-product control.
Can biological treatment be used for high-COD wastewater?
It may be used when biodegradable loading and inhibition are understood and suitable equalization, nutrient control and pretreatment are provided.
When are UF and RO used?
UF and RO may support reuse or polishing when pretreatment controls fouling and a viable concentrate-management route exists.
How is high-TDS wastewater managed?
Options may include segregation, recovery, selective treatment, membranes, evaporation or controlled disposal depending on salt composition.
Can an existing WWTP be upgraded?
Yes. A retrofit begins with hydraulic, loading, equipment, control, sludge and compliance bottlenecks and identifies staged improvements.
Can treatment be supplied as modular skids?
Yes, where capacity, transport, access, utilities and process risks support modular delivery.
What drives CAPEX and OPEX?
Flow, contaminant load, materials, redundancy and civil scope drive CAPEX; power, reagents, membranes, sludge, labor and disposal drive OPEX.
What information is required for an EPC proposal?
Representative analyses, flow ranges, batch patterns, outlet requirements, utilities, site data, drawings, residue routes and acceptance criteria are required.