The normalized conduct of physics, chemistry and biology experimental teaching in primary and secondary schools makes campus laboratory wastewater treatment a key task of campus environmental compliance management. Compared with universities and research institutions, middle school experimental wastewater has the unique characteristics of concentrated discharge, large water-quality fluctuations and unprofessional operation and maintenance personnel. Coupled with the humid and rainy climate in the south, the difficulty of long-term stable equipment operation and maintenance is greatly increased.

A middle school in Hangzhou has long carried out normalized teaching experiments, generating daily acid-base waste liquid, trace heavy-metal wastewater and biological residues, with a daily wastewater treatment capacity of 1 ton. The AiKe AK-SYFS-HW series outdoor wastewater treatment equipment installed on campus has been running stably for 4 years. In view of the instantaneous load shock brought by the concentrated post-class discharge of middle school experiments, frequent pH fluctuations, and the pain points of equipment aging and pipe siltation caused by the humid and rainy plum-rain season in Hangzhou, while solving the problem that the school has no full-time operation and maintenance personnel and weak daily equipment management, AiKe relies on its full-life-cycle after-sales maintenance system to provide free on-site special operation and maintenance services. Through comprehensive equipment maintenance, parameter calibration and hands-on teaching, it ensures the stable compliant discharge of campus experimental wastewater for a long time, and protects the construction of a green and safe campus.

📅Service time: 4 years

🏫 User organization: A middle school in Hangzhou

📍 Province/City: Hangzhou City, Zhejiang Province

🧪 Equipment Series: AK-SYFS-HW

💦 Daily Treatment: 1T

I. Analysis of Laboratory Wastewater Treatment Difficulties in a Hangzhou Middle School

As a key school in the urban basic education stage, Hangzhou Middle School has heavy teaching tasks for chemistry, biology and other subject experiments, and its laboratory wastewater treatment faces many practical difficulties.

First, the experimental teaching in middle schools has the obvious characteristic of concentrated class hours. About 1 ton of wastewater is discharged every day, mainly concentrated after the afternoon experiment class, showing a short-term high-intensity concentrated discharge situation. The instantaneous flow peak far exceeds the daily average treatment load, posing a direct challenge to the equipment's water buffer capacity and rapid response performance.

Second, the experimental content is mainly basic teaching demonstrations and student group experiments, involving neutralization, metal displacement, organic extraction and other operations. The wastewater is mixed with a variety of low-concentration acid-base liquids, heavy-metal ions and a small amount of organic solvents. Although the composition is not complex, the pH fluctuates frequently, and the pH value often jumps greatly. This requires the treatment system to have a sensitive neutralization and regulation capability.

Third, as a middle-school scenario, the school lacks full-time laboratory wastewater operation and maintenance personnel, usually managed concurrently by experimental teachers, with relatively insufficient professional technical training and fault-handling experience. The humid climate during the plum-rain season in Hangzhou keeps the equipment running in a humid environment for a long time, and the moisture-proof and anti-corrosion of electrical systems and metal parts also constitute hidden difficulties in daily management.

II. From Hidden-Danger Investigation to Hands-on Teaching: Making up for the Technical Shortcomings of the Middle School's Part-time Operation and Maintenance Team

AiKe's after-sales operation and maintenance team went to a middle school in Hangzhou, Zhejiang Province, to provide free on-site special maintenance services for the AK-SYFS-HW series 1-ton/day laboratory outdoor wastewater treatment equipment that has been in use for 4 years, so as to ensure the stable compliant discharge of campus physics, chemistry and biology experimental wastewater.

As a large public middle school with a large scale in the urban area, the school has a high frequency of group experiments in physics, chemistry and biology and student exploratory projects. The experimental wastewater components cover acid-base reagent residues, a small amount of heavy-metal salts, organic waste liquid and biological culture residues, and the discharge is highly concentrated in the period after daily experiments, with high instantaneous shock load. Coupled with the high-temperature and humid climate characteristics of Hangzhou's summer and plum-rain season, the equipment placed in a semi-open outdoor area has natural aging hidden dangers such as slight pipe siltation and electronic control parameter deviation after 4 years of continuous operation.

In this maintenance, engineers carried out a full-process inspection and cleaning of the equipment's core purification modules, corrosion-resistant pipes and intelligent electronic control system, calibrated operating parameters, investigated safety hazards, and at the same time conducted hands-on training for the school's part-time operation and maintenance experimental teachers, explaining the key points of daily inspection. After maintenance, on-site sampling and testing showed that all outlet indicators met the relevant national wastewater discharge specifications, effectively building an environmental defense line for green experiments on campus.

III. AiKe AK-SYFS-HW Series Laboratory Wastewater Treatment Equipment Features

▶▷ Wide applicability, adaptable to comprehensive wastewater treatment in various laboratories;

▶▷ Multiple advanced patented technologies are adopted for multi-stage treatment and purification of wastewater to meet discharge standards;

▶▷ Centralized control with high automation, simple operation, fully automatic operation, no need for dedicated personnel;

▶▷ Automatic water-leakage and electric-leakage protection, high/low voltage automatic protection, no-wastewater protection, and liquid tank level protection functions;

▶▷ Dynamic operation with digital LCD display of water quality indicators;

▶▷ Modular integration technology with good treatment effect, no secondary pollution, and low operating cost;

▶▷ Acid and alkali corrosion resistance, low noise, low power consumption, multiple safety protection and other features;

▶▷ Precise liquid level automatic control: runs with water, stands by without water;

▶▷ Through"one-stop" integrated design: beautiful appearance, small footprint, fast processing speed, low investment, easy installation and movement, large processing capacity, good treatment effect, low energy consumption, no noise, no leakage, truly realizing engineering equipmentization;

▶▷ No civil construction treatment tank needed; no secondary pollution such as waste residue, waste gas, or wastewater;

▶▷ Timed on/off function: the equipment can set automatic morning power-on and evening power-off times according to the customer's situation; after the time is set, the equipment automatically powers on every morning and off every evening, freeing operators from going to the equipment room every morning and evening to turn it on and off;

▸▸ Configured with 4G IoT remote monitoring and PLC functions (optional): users only need to install the remote control software on their mobile phones and office computers to remotely monitor, operate and manage this wastewater treatment equipment, and understand the equipment's operation status in real time.

▸▸ This series is suitable for placement outdoors without protection. The outer paint uses high-grade outdoor automotive surface paint, which can withstand sun and rain for a long time and ensure safe operation.

IV. Discharge Standards of AiKe AK-SYFS-HW Series Laboratory Wastewater Treatment Equipment

☑ Integrated Wastewater Discharge Standard (GB8978-1996)

☑ Water Quality Standard for Wastewater Discharged into Urban Sewers (GB/T 31962-2015)

☑ Discharge Standard of Water Pollutants for Medical Organizations (GB18466-2016)

☑ User-specified treatment requirements or local relevant wastewater discharge policies