Saline Wastewater Compliance Discharge System (Metal Surface Treatment Industry)

• Transport Package: Container
• Specification: 3500mm (length) ×2000mm (width) ×2200mm (height)
• Trademark: Chlory
• Origin: China

Product Description

Product Overview

Waste Lye Purification and Recovery System

The Waste Lye Purification and Recovery System, developed by Zhengzhou Chlory Technology Co., Ltd.—a National High-tech Enterprise with over 20 years of membrane separation expertise—is a specialized integrated solution tailored for the treatment of industrial waste lye. Generated from petrochemical refining, metal surface treatment, textile printing and dyeing, papermaking, and other industrial processes, waste lye features high alkalinity (pH>11), complex impurities (oils, phenols, suspended solids, sulfides, etc.), and large discharge volumes. Traditional treatment methods (neutralization, plate-frame filtration) lead to resource waste and environmental pollution, while this system adopts advanced membrane separation technologies (Microfiltration - MF, Ultrafiltration - UF, Nanofiltration - NF, Reverse Osmosis - RO) combined with evaporation concentration and advanced oxidation processes.

It realizes four-stage integrated processing of waste lye: pretreatment for oil and suspended solid removal, deep purification for organic/inorganic impurity elimination, concentration for alkali recovery, and post-treatment for standard-compliant discharge. Operating efficiently with low energy consumption, the system recovers high-purity lye (NaOH, KOH) for reuse and ensures treated wastewater meets national discharge standards (GB 8978-1996). Fully compliant with industrial environmental protection and safety requirements, it has been widely applied in petrochemical, metal processing, textile, and papermaking industries, achieving dual goals of resource recycling and environmental protection.

Core Advantages

Resource Recycling, Cost Reduction

High-Efficiency Purification, Stable Quality

Recovers high-purity lye from waste lye, with a recovery rate of ≥85%, reducing fresh lye procurement costs by 30-60% for enterprises. Synchronously recovers valuable components such as oils and catalysts, maximizing resource utilization.

Multi-membrane coupling technology achieves precise impurity separation: MF removes ≥99% of suspended solids and free oil; UF intercepts macromolecular organics and colloids; NF/RO separates salts and alkali. The recovered lye has a purity of ≥90%, meeting production reuse standards.

Resource Recycling, Cost Reduction

Strong Adaptability, Wide Application

Corrosion-Resistant Design, Durable Operation

Membrane separation operates at room temperature without phase change, consuming only 30-40% of the energy of traditional evaporation concentration. Minimal chemical agents are added, avoiding secondary pollution, and treated wastewater meets discharge standards, reducing environmental compliance risks.

Customizes process configurations based on waste lye characteristics (pH, impurity composition, concentration) from different industries. Adapts to high-COD, high-salt, and emulsified waste lye, suitable for petrochemical, metal surface treatment, textile printing and dyeing, and papermaking industries.

All wetted parts are made of corrosion-resistant materials (316L stainless steel, PVDF membranes) to withstand strong alkaline environments (pH 11-14). Equipped with anti-fouling membrane modules and online CIP cleaning systems, extending membrane service life to 2-3 years.

Main Features

1. Four-Stage Integrated Design

2. Intelligent Automatic Control

Integrates pretreatment, deep purification, alkali concentration, and wastewater post-treatment in one system. The standardized process (oil-water separation → MF pretreatment → UF/NF deep purification → RO/evaporation concentration → post-treatment) simplifies workflow, reducing equipment investment and floor space by 30% compared to traditional split processes.

Equipped with a PLC control system and touchscreen interface, enabling real-time monitoring and automatic adjustment of key parameters (pressure, flow rate, temperature, COD, salt content). Supports unattended operation, automatic backwashing, and abnormal alarm functions (overpressure, membrane fouling), minimizing manual intervention.

3. Flexible Process Configuration

Offers multiple process combinations based on treatment needs:

Small-to-medium scale: Membrane separation (MF+UF+RO) for low energy consumption and compact layout.
Large-scale/high-concentration demand: Membrane separation + MVR evaporation for high concentration ratio (up to 20-30% lye concentration).
High-COD waste lye: Advanced oxidation (ozonation/Fenton) + membrane separation for efficient organic pollutant degradation.

4. Complete Supporting Systems

5. Turnkey Project Capability

Integrates core equipment such as coalescence oil separators, membrane modules, MVR evaporators, and advanced oxidation reactors. Matches auxiliary systems including CIP cleaning, solvent recovery, and wastewater biochemical treatment, forming a closed-loop treatment chain.

Offers one-stop services including technical consultation, waste lye analysis, pilot-scale validation, equipment manufacturing, on-site installation, commissioning and training. The system seamlessly integrates with existing production lines, ensuring smooth operation and rapid achievement of designed production capacity.

Technical Parameters

Parameter Category	Specification Range
Processing Capacity	500 L/h – 50,000 L/h (customizable based on production needs)
Membrane Configuration	MF: 0.1–1.0 μm; UF: 10–50 kDa; NF: 200–500 Da; RO: <0.001 nm (selectable)
Operating Pressure	MF: 0.2–0.5 MPa; UF: 0.3–0.7 MPa; NF: 1.5–2.5 MPa; RO: 2.0–4.0 MPa
Operating Temperature	5–45℃ (optimal: 25–35℃)
Treatment Efficiency	Oil removal rate ≥95%; Suspended solid removal rate ≥99%; COD reduction rate ≥80%; Salt rejection rate ≥90%; Alkali recovery rate ≥85%
Feed Liquid Adaptability	pH: 9–14; Viscosity: ≤100 mPa·s; Applicable to high-COD, high-salt, emulsified waste lye
Material in Contact with Product	316L stainless steel, PVDF membranes, corrosion-resistant seals
Control System	PLC automatic control + touchscreen; Real-time monitoring of pressure/flow/COD/salt content
Power Consumption	0.8–2.5 kW·h/m³ of treated liquid (varies by process configuration)
Membrane Service Life	2–3 years (under normal operation and maintenance)
Recovered Lye Concentration	10–30% (adjustable based on production reuse requirements)

Core Components

Component Unit	Core Equipment	Function Description
Pretreatment Unit	Coalescence oil separator, demulsifier, MF membrane modules, buffer tank	Separate free oil and emulsified oil; remove suspended solids and colloids; reduce subsequent process load
Deep Purification Unit	UF/NF membrane modules, advanced oxidation reactor (ozonation/Fenton), ion exchange resin column	Remove macromolecular organics, colloids, salts, and toxic impurities; degrade refractory organics
Concentration Unit	RO membrane system, MVR evaporator	Concentrate purified lye from 2-5% to 10-30%; recover high-purity alkali for reuse
Post-Treatment Unit	Neutralization tank, biochemical treatment system (activated sludge process)	Adjust pH of separated wastewater to 6-9; degrade residual organics to meet discharge standards
Control & Cleaning Unit	PLC controller, COD/salt content online analyzer, CIP cleaning system	Automate process control and monitoring; clean membrane modules and pipelines online

Application Scenarios

1. Petrochemical Industry

2. Metal Surface Treatment Industry

Application: Treatment of waste lye from crude oil desulfurization and alkylation processes.
Process Solution: Coalescence oil separation → MF → UF → RO concentration → MVR evaporation.
Value: Recovers NaOH with purity ≥92%; reduces fresh alkali consumption by 40%; treated wastewater COD ≤100 mg/L, meeting discharge standards.

Application: Purification and recovery of alkaline degreasing wastewater from steel/aluminum products.
Process Solution: Demulsification → MF → UF → RO concentration.
Value: Recovers lye for reuse in degreasing; removes oils and metal ions; reduces wastewater discharge by 70%.

3. Textile Printing and Dyeing Industry

4. Papermaking Industry

Application: Treatment of mercerizing waste lye to recover NaOH.
Process Solution: MF pretreatment → NF desalination → RO concentration.
Value: NaOH recovery rate ≥88%; recovered lye meets mercerizing process requirements; reduces environmental pollution from high-alkaline wastewater.

Application: Treatment of black liquor (alkaline wastewater) from pulping process.
Process Solution: MF → UF (lignin separation) → RO concentration → MVR evaporation.
Value: Recovers alkali and lignin; alkali reuse rate ≥85%; lignin can be used as biofuel, realizing resource recycling.

Company Profile

Chlory Technology Company

With 20+ years of experience in chlorination system manufacturing, Chlory  is a certified (ISO 9001, ISO 14001, ISO 18001) original equipment manufacturer (OEM) specializing in water treatment solutions. We offer: 
1. Customized package design (AutoCAD, SolidWorks-supported engineering).
2. After-sales services: On-site inspection, electrolyzer refurbishment, and capacity upgrades.
3. Membership in China's Chlorine Committee, ensuring compliance with global industry standards.