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Small Test

ONYX has established a photochemical pilot test base of several hundred square meters at its Tianjin production base, which can carry out small-scale water treatment tests for enterprises in need.


Introduction

The process is as follows:

1. Preliminary Communication

1.1 Wastewater Data Collection

• Obtain MSDS and complete water quality analysis (COD, BOD₅, TOC, characteristic pollutants, salinity, toxicity, etc.)

• Clarify discharge destination and target limits (national/local standards or internal reuse indicators)

1.2 Objective Confirmation

• Determine the primary objectives of the pilot test: toxicity reduction, biodegradability improvement, characteristic pollutant removal rate, or COD removal rate, etc.

2. Experimental Design

2.1 Plan Development

• Select an oxidation system based on wastewater characteristics, such as UV-AOP, UV/hydrogen peroxide, UV/ozone, or persulfate.

• Design a single-factor (pH, oxidant dosage, UV power, reaction time) and orthogonal/response surface optimization experimental matrix.

2.2 Safety Assessment

• SDS Review: Confirm there is no risk of generating more toxic byproducts after UV photolysis.

• Laboratory ventilation, protection, wastewater neutralization, and separate collection plans.

3. Pilot Experiment

3.1 Apparatus Preparation

• Use a 0.5–5 L batch or continuous flow microreactor equipped with an adjustable power low-pressure mercury lamp or medium-pressure lamp

• Online temperature control (20–40°C), magnetic/mechanical stirring, and a quartz sleeve for anti-fouling

3.2 Operation

• Measure relevant water quality indicators and adjust pH (typically a gradient between 3 and 9)

• Add oxidant and catalyst

• Set UV dose

• Take samples for monitoring at different time intervals

3.3 Sample Analysis

• Rapid indicators: ORP, DO, pH, temperature

• Key indicators: COD, TOC, concentrations of characteristic pollutants

• Byproducts: Formaldehyde, nitrate, bromate, etc. (if necessary)

4. Data Processing

4.1 Calculate removal efficiency and plot curves

4.2 Preliminary Economic Evaluation

• Estimate oxidant, power consumption, lamp depreciation, and hazardous waste disposal costs

• Compare costs with other treatment processes

5. Results Report

5.1 Pilot Test Report

• Includes experimental setup diagrams, raw data, optimal operating conditions, and before-and-after toxicity/biodegradability comparisons.

• Recommended scale-up for pilot testing (generally 50–100x) and process risk points.

5.2 Technical Handover

• Provide process package: reactor type, residence time, oxidant dosing control logic, lamp cleaning method.

• Clarify subsequent pilot site requirements (water inflow, hydraulic retention time, and online monitoring configuration).

Notes

1. If the wastewater contains high salt content (>100 g/L) or high color, first assess its impact on UV transmittance.

Add a dilution or pre-decolorization step if necessary.

2. For biological wastewaters such as antibiotics and hormones, the pilot test should focus on "toxicity reduction and improving the B/C ratio," rather than achieving compliance immediately. Subsequent biochemical or advanced treatment is still required.

3. UV spectroscopy should be verified during the pilot test. The lamp scaling/fouling rate provides data for the frequency of online cleaning or chemical cleaning in subsequent pilot tests.


Parameter

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