Water Treatment Equipment Research Articles

Toxicity, degradation and metabolic pathway of 4-chlorinephenol in Chlorella vulgaris

Environmental contamination by 4-chlorinephenol (4-CP) has received widespread attention due to its frequent detection and adverse environmental effects. The traditional water treatment approaches and equipment are relatively mature, making them easier to operate and maintain. However, 4-CP is particularly difficult to degrade using the technologies, often resulting in incomplete removal, secondary pollution, or high energy consumption. The present study explored the toxicity of 4-CP to Chlorella vulgaris and its removal mechanism in microalgae. The results revealed that the photosynthetic activity and the growth of C. vulgaris were inhibited at high-level 4-CP (≥ 60 mg/L) during the whole exposure period. The dry weight and Chlorophyll-a content of C. vulgaris in the 4-CP treatment at 90 mg/L were only 72.3 % and 72.1 % of the control group, respectively. The structure and function of C. vulgaris was dramatically impacted under 4-CP stress. Malondialdehyde content, superoxide dismutase and catalase activities were significantly increased under multiple 4-CP concentrations, rising by 217 %, 299 %, and 78 % at 90 mg/L 4-CP compared to the control. Additionally, the removal of 4-CP by C. vulgaris aligned more closely with the pseudo-first-order model than with the pseudo-second-order model. As 4-CP concentration rose from 10 to 90 mg/L, the 4-CP removal rate decreased from 86.0 % to 56.7 % and the half-life was increased from 5.419 to 7.673 d based on the pseudo-first-order kinetics of 4-CP removal by C. vulgaris. Biodegradation is the major pathway for 4-CP removal by C. vulgaris, accounting for 72.54 % of the total removal rate at 30 mg/L on the 6th day. A total of 5 metabolites were detected for 6-day cultivation, including 4-chlorocatechol, hydroquinone, pyrogallol, 1,4-benzoquinone and succinic acid. This work provided an insight into the removal mechanism and biodegradation pathway of 4-CP in C. vulgaris.

Construction of an S-scheme electron transfer channel in Cu0/CuFe2O4 magnetic plate column reactor for the LEV degradation: New strategy of visible Photo-Fenton system application

The complicated loading process and easy falling off of powder catalysts still restrict the wide application of Photo-Fenton technology in practical water treatment. In this study, a magnetic fixed film plate column water treatment equipment is designed as a visible Photo-Fenton reactor to remove levofloxacin (LEV). The effect of magnetic force can ensure that the catalyst is firmly fixed, and the multi-level shallow column plate structure achieves full contact and efficient reaction between the catalyst and wastewater. Simultaneously, the Cu0/CuFe2O4 (STCCF) utilizes Cu0 to construct an S-scheme electron transfer channel, which improves the separation efficiency of photo-generated carriers and provides sufficient photo-generated electrons for the reduction of Fe (Ⅲ) and Cu (Ⅱ). The pseudo-first-order reaction kinetic constant k for the degradation of LEV in the visible Photo-Fenton system is 0.0349 min−1, which is 15.9 times that of the photocatalytic system and 4.8 times that of the Fenton system. After continuous operation for 72 h, the magnetic fixed film plate column reactor can still remove more than 90 % of LEV and 82 % of COD in the secondary effluent of simulated antibiotic pharmaceutical wastewater treatment process, and the effluent is stable and meets the standard. The magnetic fixed film plate column reactor can be used for advanced treatment of antibiotic pharmaceutical wastewater. This study provides a new insight into the application of the Photo-Fenton process.

ФОРМИРОВАНИЕ СИСТЕМЫ ЭКОЛОГИЧЕСКОЙ БЕЗОПАСНОСТИ ПРОЦЕССОВ ВОДОПОДГОТОВКИ И ОЧИСТКИ СТОЧНЫХ ВОД НА ОСНОВЕ ПРИНЦИПОВ РЕСУРСОСБЕРЕЖЕНИЯ И ПРИРОДОПОДОБИЯ

Environmental safety refers to the state of protection of the natural environment and humans by ensuring an acceptable level of negative impact of natural and anthropogenic environmental hazards on the environment and humans. Based on the principles of nature similarity, resource substitution and conservation, modules and components of environmental safety of drinking water treatment and wastewater treatment processes have been formed. The functions of each module of the aquatic safety ecosystem are disclosed. Dangerous events and hazard factors in the processes of water treatment and water treatment are presented. The content of the system components of environmental safety of water treatment and wastewater treatment processes has been established: sanitary and epidemiological safety, consumer safety, technical safety, environmental safety of production and environmental and economic safety. An algorithm for the environmentally sustainable functioning of water management facilities, long-term and trouble-free operation of water treatment equipment, preservation of the health of water consumers and minimizing the impact on reservoirs, natural water sources (underground and surface) is proposed.

Research on Carbon Dioxide-Assisted Electrocoagulation Technology for Treatment of Divalent Cations in Water

In the external drainage water of Xinjiang Karamay Petrochemical Company, the calcium and magnesium ion contents are as high as 630 mg/L and 1170 mg/L, respectively. These ions are subsequently scaled at large quantities in water treatment equipment, which greatly reduces the efficiency of the process. This study used a coupled chemical precipitation (CP) and electrocoagulation (EC) method to deal with external drainage water. The results show that the removal rates of calcium and magnesium were 94.71% and 96.33%, respectively, when the pH was adjusted with sodium silicate and EC was introduced after saturating the water samples with CO2. In this study, a quadratic polynomial equation was developed for predicting the removal of calcium and magnesium ions using this coupled technique under three factors of current density (CD) (15, 20 and 25 mA/cm2), reaction time (RT) (30, 40 and 50 min) and pH (10.0, 10.5 and 11.0). It was found that these three variables have a significant effect on the removal of both the abovementioned ions. The response surface method based on a Box–Behnken design showed that the average removal rates of calcium and magnesium ions could be 96.57% and 98.66% at a CD of 22 mA/cm2, RT of 46 min and pH of 11. This study confirmed the presence of calcium carbonate in the solid product through XRD and SEM analysis. The results indicate that this study is promising, and the developed technique can also be used to remove the high concentrations of calcium and magnesium ions from different wastewaters.

Cost prediction for water reuse equipment using interpretable machine learning models

During the initial stages of engineering projects management, the accurate estimation of equipment costs plays a crucial role in determining project approval decisions. However, there is a significant research gap regarding the estimation of investment costs for water reuse equipment. Additionally, cost predictions for such construction projects often suffer from limitations, including low accuracy, limited generalizability, and inefficiency. Advanced machine learning (ML) methods, renowned for their ability to model complex decision-making processes, offer powerful solutions. In this study, four traditional models and four ensemble models were employed to predict the cost of water reuse equipment. The results demonstrated that the ensemble models exhibited significantly superior predictive performance to that of traditional models with the three boosting ensemble models achieving the best performance (traditional models: training R2 = 29.77 %–94.85 %, testing R2 = 30.62 %–71.72 %; boosting ensemble models: training R2 = 97.42 %, testing R2 = 82.16 %–93.79 %). Furthermore, this study simplified the features of predictive models and identified the key variables that influence the cost of water reuse equipment using Shapley additive explanations (SHAP) method. The retrained ensemble models re-constructed based on the selected variables achieved significant predictive performance, with the Gradient Boosting Decision Tree (GBDT) outperforming the other models (training set R2 = 97.37 %, testing set R2 = 93.86 %). The water quantity, inflow conductivity, outflow conductivity, and recovery rate emerged as critical factors affecting the cost of water reuse equipment. Overall, the methods proposed in this study can enhance the versatility of cost prediction processes in environmental engineering scenarios, particularly those concerning the construction costs of water treatment equipment.

Ultraviolet technology application in urban water supply and wastewater treatment in China: Issues, challenges and future directions

This study thoroughly explores the application of Ultraviolet (UV) water treatment technology in urban wastewater treatment and water supply in China, highlighting its crucial role in enhancing water quality safety. UV technology, with its environmentally friendly and low-carbon characteristics, is deemed more in line with the demands of sustainable development compared to traditional chemical disinfection methods. The widespread application of UV technology in urban wastewater treatment in China, particularly in the context of urban sewage treatment, is examined. However, to better promote and apply UV technology, there is a need to deepen the understanding of this technology and its application among a broad base of users and design units. The importance of gaining in-depth knowledge about the performance of UV water treatment equipment, the design calculation basis, and operational considerations, as well as the ongoing development of relevant standards, is underscored to ensure that the equipment used in projects complies with engineering design and production requirements. Furthermore, the positive trend of UV technology in the field of advanced oxidation, indicating a promising trajectory for engineering applications, is pointed out. Regarding the prospects of industrial development, a thorough analysis is conducted in the article, emphasizing the necessity for all stakeholders to collaborate and adopt a multi-level approach to promote the sustainable development and application of UV water treatment technology. This collaborative effort is crucial for providing effective safeguards for China's environment, ecology, and human health.

Hygienic assessment of water quality and safety according to national requirements

There are only 15 % of water reservoirs in Ukraine that can be used as sources of water supply, taking into account water treatment facilities. 55 % of polluted objects and 30 % very dirty, water from these sources cannot be used even after cleaning. With the help of sanitary-hygienic, ecological and water management assessment, they ensure the quality of water in the impact on the environment and the quality of fish products. The main documents that determine the quality, properties and chemical composition of drinking water are DSTU 7525:2014 and DSTU 27384:2005, they specify the main toxicological and organoleptic concentrations of chemicals that must be contained in water. The standard “Sources of centralized economic drinking water supply, hygienic and ecological requirements for water quality and selection rules” makes it possible to develop a complex of interrelated standards and norms, including the use, protection and restoration of water resources, objective assessment of the ecological state and quality of surface and underground waters and their compliance with the requirements of EU standards. Water treatment equipment and technologies used nowadays for wastewater treatment do not provide a sufficient degree of purification and disinfection. Surface water reservoirs, along with impurities of natural origin, contain chemical pollution – heavy metals, pesticides, insecticides, oil products, phenols. The methods of wastewater disinfection are divided into chemical, physical, physico-chemical and in the conditions of artificial and natural biocenoses.

Research on the descaling characteristics of a new electrochemical water treatment device.

In recent years, chemical water treatment equipment has gained significant attention due to its environmental-friendly features, multifunctionality, and broad applicability. Recognizing the limitations of existing chemical treatment equipment, such as challenges in scale removal and the high water content in scale deposits, we propose a novel drum design for both anode and cathode, enabling simultaneous scale suction and dehydration. We constructed a small experimental platform to validate the equipment's performance based on our model. Notably, under the optimal operating parameters, the hardness removal rate for circulating water falls within the range of 19.6-24.46%. Moreover, the scale accumulation rate per unit area and unit time reaches 13.7 g h-1 m-2. Additionally, the energy consumption per unit weight of the scale remains impressively low at 0.16 kWh g-1. Furthermore, the chemical oxygen demand (COD) concentration decreased from an initial 106.0 mg L-1 to a mere 18.8 mg L-1, resulting in a remarkable total removal rate of 82.26%. In conclusion, our innovative electrochemical water treatment equipment demonstrates exceptional performance in scale removal, organic matter degradation, and water resource conservation, offering valuable insights for future research and development in chemical treatment equipment and electrochemical theory.

Development and application of random forest regression soft sensor model for treating domestic wastewater in a sequencing batch reactor

Small-scale distributed water treatment equipment such as sequencing batch reactor (SBR) is widely used in the field of rural domestic sewage treatment because of its advantages of rapid installation and construction, low operation cost and strong adaptability. However, due to the characteristics of non-linearity and hysteresis in SBR process, it is difficult to construct the simulation model of wastewater treatment. In this study, a methodology was developed using artificial intelligence and automatic control system that can save energy corresponding to reduce carbon emissions. The methodology leverages random forest model to determine a suitable soft sensor for the prediction of COD trends. This study uses pH and temperature sensors as premises for COD sensors. In the proposed method, data were pre-processed into 12 input variables and top 7 variables were selected as the variables of the optimized model. Cycle ended by the artificial intelligence and automatic control system instead of by fixed time control that was an uncontrolled scenario. In 12 test cases, percentage of COD removal is about 91. 075% while 24. 25% time or energy was saved from an average perspective. This proposed soft sensor selection methodology can be applied in field of rural domestic sewage treatment with advantages of time and energy saving. Time-saving results in increasing treatment capacity and energy-saving represents low carbon technology. The proposed methodology provides a framework for investigating ways to reduce costs associated with data collection by replacing costly and unreliable sensors with affordable and reliable alternatives. By adopting this approach, energy conservation can be maintained while meeting emission standards.

Development of a new design of deironing granulated filter for joint removal of iron and ammonium nitrogen from underground water

ABSTRACT Providing the population with high-quality drinking water is one of the main state tasks. Rural water supply systems and water supply systems of small settlements in the region require special attention, namely, the development of technologies for individual, small-sized water treatment equipment, as well as equipment for collective use, designed to purify groundwater for drinking purposes. In many areas, there are groundwaters containing excess levels of several pollutants, which makes their purification much more difficult. Elimination of shortcomings in the known methods of water iron removal is possible by reconstructing existing water supply systems from underground sources in small settlements. A rational solution is to search for groundwater treatment technologies that make it possible to provide the population with high-quality drinking water at a lower cost. The result of increasing the concentration of oxygen in water was obtained in the process of modifying the filter by changing the excess air exhaust system, which was made in the form of a perforated pipeline located in the lower half of the granular filter layer connected to the upper branch pipe. At the same time, high-quality groundwater treatment, sufficient simplicity and reliability in operation are ensured, local conditions and the inaccessibility of many objects and settlements in the region are taken into account as much as possible. After the filter was upgraded, the concentration of iron decreased from 4.4 to 0.27 mg/L and ammonium nitrogen from 3.5 to 1.5 mg/L.

Prototype Design of Water Treatment Equipment Domestic Waste

A prototype design for domestic wastewater treatment has been carried out using the concept of filtration, in which this prototype consists of 2 filters to treat domestic wastewater, the first filter uses a 10-inch cartridge filter media in which filter materials are composed, namely cotton, ferrite, and activated carbon. Then the second filter uses an RO 75 GPD filter which consists of a hollow fiber membrane and has pores of 0.0001 microns. Domestic wastewater from the input reservoir is pumped through the PVC and into filter 1, namely the carbon filter media inside the cartridge filter, the produced water is passed through the ferrite filtration media and then inserted into the membrane, the produced water enters the membrane and RO filter then produces processed wastewater that has been clean and enter into the output reservoir. The results of the functional test explained that the flow velocity of treated wastewater passing through the ¾ inch connecting pipe was 0.22 m/s or 0.24 m3/hour and it took 2 hours to fill an aquarium with a water capacity of 57 liters.

Water treatment implementation in improving shallow ground water quality with a combination filter-aerator method

It is undeniable that humans are very dependent on water. The problem is, access to clean water evenly in the Bugis Village, Dumbo Raya District, Gorontalo City, North Sulawesi Province has not been fulfilled. In addition, the Clean and Healthy Living Movement Program initiated by the government since 2016 has not been felt by the whole community. The purpose of the Community Service activity is training in making water treatment equipment as a means of improving water quality. Meanwhile, the only affordable source of clean water that can be used is groundwater. One of the problem factors in coastal areas is the quality of clean water that does not meet health requirements (Physical parameters, namely water that is yellow and smells while the Chemical parameters, namely the average concentration of Iron (Fe) = 9.94 Mg/l and Manganese (Mn) average = 8.8 Mg/l so it also has a negative impact on human health Training and demonstration approaches but still accompanied by discussions and lectures to provide information are the methods used in programs that will be carried out to be more effective and efficient for improvement Community-Based Total Sanitation Then empowering the community will create water filtration technology Combination Water Treatment with the Filter-Aerator Method that is affordable and can be operated with minimal resources and resources using materials that are widely available in the area. The empowerment location is approximately 10 Km from Makassar City, namely Barombong Village, Ma City Kassar of South Sulawesi Province and in the Bugis Village, Kec. Dumbo Raya, City of Gorontalo, North Sulawesi Province

Analysis of Ballast Water Discharged in Port—A Case Study of the Port of Ploče (Croatia)

Ballast water is recognized as a major vector for the transfer of Harmful Aquatic Organisms and Pathogens (HAOP) and a source of sea pollution that negatively affects the environment and human health. Therefore, the International Maritime Organization (IMO) adopted the International Convention for the Control and Management of Ship’s Ballast Water and Sediments (BWM Convention) in 2004. The BWM Convention introduced two standards, Ballast Water Exchange Standard (Regulation D-1) and Ballast Water Performance Standard (Regulation D-2). Ships are required to install Ballast Water Treatment (BWT) equipment in order to comply with Regulation D-2. However, the deadline for the installation of BWT is prolonged until September 2024, and many ships are still complying only with Regulation D-1. In addition, there are specific sea areas where Regulation D-1 cannot be complied with, and hence, HAOP could be easily transferred between ports. Consequently, it is essential to develop a system to protect the marine environment, human health and economy in coastal areas from the introduction of HAOP. This paper analyses ballast water discharged in the Port of Ploče (Croatia) according to ship type, age and flag they are flying. It was found that general cargo ships and bulk carriers discharged most of the ballast (87% of the total quantity) in the Port of Ploče. Moreover, discharged ballast water was analysed according to the origin, and it was found that 70% of discharged ballast originates from the Adriatic Sea. Based on the analysis of the research results and literature review, the ballast water risk assessment (BWRA) method was adopted, however, with certain modifications. The adopted method is modified by an additional risk factor (the deballasting ship’s age), different risk scoring of the deballasting ship type and adding Paris MoU Grey and Black lists flag ships as high-risk ships. As a result, the BWRA method presented in the paper could be used as an early warning system and to facilitate the implementation of adequate measures to prevent pollution by discharged ballast water.

Nitrogen migration law and recycling strategy in an innovative recirculating aquaculture system: Enhancing performance through electrocoagulation

In this study, electrocoagulation (EC), a green and efficient water treatment technology, was used to improve the performance of the Litopenaeus vannamei (L. vannamei) RAS. The main objective was to investigate the nitrogen migration law of the innovative L. vannamei RAS, establish a nitrogen recovery strategy, and promote the sustainable development of the L. vannamei RAS. It was found that 34.22 % of input nitrogen (NInput) accumulated in live shrimp, 3.83 % and 0.69 % of NInput existed in shed shrimp shell and dead shrimp, 41.31 % of NInput was removed by the water treatment equipment, 9.75 % of NInput was removed through water exchange, and 2.89 % of NInput accumulated in the RAS. Under the action of the EC, the removal of nitrogen by a microscreen drum filter (MDF), moving-bed biofilm reactor (MBBR) and foam separator (FS) increased by 26.39 %, 9.52 %, and 9.10 %, respectively. Moreover, a Chlorella vulgaris culture system was used to recycle the waste nitrogen of the L. vannamei RAS, with a nitrogen recovery rate of 80.84 %. These findings indicate that EC can significantly enhance the nitrogen removal of RAS, and the Chlorella vulgaris can be used for the efficient recovery of the waste nitrogen from RAS.

Performance Analysis of Ceramic Membranes in Clean Water Treatment on River Water Quality

The clean water treatment process changes the physical, chemical, and biological properties of water so that it meets the requirements for use as drinking water or daily needs. The purpose of this research is to analyze the performance of ceramic membranes in processing water from the Kelekar River into clean water using an environmentally friendly microfiltration–adsorption–ceramic membrane integrated process. The research was carried out from January to April 2022 at the Chemical Engineering Laboratory of the Sriwijaya Polytechnic. The sampling location for this research is Kelekar River, Karang Raja Village, East Prabumulih. The main tools and materials are a series of water filters (microfiltration–adsorption–ceramic membrane) and river water. The analysis results show that a series of microfiltration-adsorption-ceramic membrane integrated process water treatment equipment can be used to treat river water into clean water. Based on the analysis of river water quality parameters, such as BOD5, iron (Fe), manganese (Mn), nitrate (NO3-), ammonia (NH3-N), and total coliform bacteria after water treatment were within environmental quality standards. Meanwhile, COD and nitrite (NO2-) were still not meeting the environmental quality standards set by Government Regulation of Republic Indonesia No. 22 of 2021 concerning the implementation of environmental protection and management.

Appropriate Technology in the Treatment of Clean Water on Islamic Boarding Schools in Sungai Itik Village

Sungai Itik Village is located in Sungai Kakap District, Kubu Raya Regency, directly visiting Pontianak City. However, the people in Itik Village have not yet enjoyed clean water from the local water company. So that the surrounding community uses clean water sourced from rainwater or drilled wells. However, the condition of the well water is not yet suitable for use. At the As-Siddiqiyah Islamic Boarding School, it has drilled wells with a flow rate of 30 liters/minute and does not need to be sucked up with a water pump in flat, level conditions. However, the condition of the water still contains a lot of Fe2+ ions, has a metallic smell and color. This drilled well water is very possible as raw water to be processed and used as drinking water that can be consumed by the community around the Islamic boarding school. The Student Creativity Program Team of the Faculty of Engineering provides air purification solutions with the Aeration, Sedimentation and Filtration methods contributing to the local community, especially for students at Islamic Boarding Schools. The results of laboratory tests on drilled well water at the As-Siddiqiyah Islamic Boarding School show that raw water that has been treated through water treatment equipment is suitable for daily activities and does not cause health problems. The provision and management of clean water is left entirely to the students in Islamic boarding schools to maintain the continuity and maintenance of the availability of clean water.

Formation of Nanochannels Using Polypropylene and Acetylcellulose for Stable Separators.

In this study, a polymer separator with enhanced thermal stability is prepared to solve the problem of thermal durability of lithium-ion battery separators. This separator is manufactured by coating a solution of acetyl cellulose and glycerin on polypropylene. The added glycerin reacts with the acetyl cellulose chains, helping the chains become flexible, and promotes the formation of many pores in the acetyl cellulose. To improve the thermal stability of the separator, a mixed solution of acetyl cellulose and glycerin was coated twice on the PP membrane film. Water pressure is applied using a water treatment equipment to partially connect the pores of a small size in each layer and for the interaction between the PP and acetyl cellulose. SEM is used to observe the shape, size, and quantity of pores. TGA and FT-IR are used to observe the interactions. Average water flux data of the separators is 1.42 LMH and the decomposition temperature increases by about 60 °C compared to the neat acetyl cellulose. It is confirmed that there is an interaction with PP between the functional groups of acetyl cellulose.

Discussion on the Application of Reverse Osmosis Water Treatment Equipment in Industrial Sewage Treatment

Discussion on the Application of Reverse Osmosis Water Treatment Equipment in Industrial Sewage Treatment

PEMBUATAN SARINGAN CEPAT (RAPID FILTER) (Penggunaan Pipa PVC Dengan Sistem Pencuci Balik (Backwash) Di SMAN 1 Jejawi OKI)

Water is the basic need of every living thing, especially humans, animals and plants. Without water, living things cannot be alive. Jejawi District is an area of ​​Ogan Komering Ilir (OKI) Regency, South Sumatra Province with a population of 38,098 people. The people of Jejawi District get water for their daily needs from the river and well. The use of water with low quality might potentially cause diarrhea. As such, it is regarded as a potential endemic disease and is an Extraordinary Events (KLB) causing death. The prevalence of diarrhea in children under five in OKI Regency reached 11.35% where Jejawi District was in the fifth place with the highest cases that are 1,328 cases of diarrhea. Given the importance function of water, as one of the study programs at PGRI Palembang University, the chemical engineering study program is committed to contributing to environmental management, especially in the area of ​​South Sumatra, one of which is about water. Some of the courses listed in the curriculum in chemical engineering study programs include water treatment equipment used in water management, such as water filters. A Water filters are tools that can be used to filter and eliminate impurities in the water, by means of a barrier, either by chemical, physical or biological processes. Water filters are widely useful in irrigation, drinking water, aquarium as well as swimming pool. One type of filter that is commonly used is a fast filter water filter (Rapid Filter) with a back wash system. Therefore as an application of the learning outcomes in the chemical engineering study program at the PGRI University of Palembang, As well as helping the problems in Jejawi disrict, particullarly for the academic community of sman 1 jejawi in water treatment, the training was held to make water rapid filter by back wash system.

COMPARISON OF GROW-OUT METHODS OF SAND LOBSTER (Panulirus homarus) WITH RECIRCULATION AQUACULTURE SYSTEM (RAS) AND FLOW-THROUGH (FT): STUDY OF BIOLOGICAL ACTIVITIES

Aquaculture technology using Recirculating Aquaculture System (RAS) is basically a technology for fish farming by reusing water used in production. This technology is based on the use of mechanical and biological filters, and this method in principle can be used for all species cultivated in aquaculture such as fish, shrimp, shellfish and others. This study was carried out at Station for Investigation of Fish Health and Environment (LP2IL) Serang’s field test facility starting from June to November 2020 (110 days of sand lobster grow-out period). In this study, the RAS system used for grow-out of sand lobster uses a series of containers, compartments, tanks and equipment for water treatment with the following purification stages (1) sedimentation containers; (2) physical filtration; (3) biological filtration, (4) disinfection of water by UV irradiation, (5) removal of CO2, (6) clean water reservoirs and (7) tanks for grow-out of sand lobster. In this study, a series of tests were carried out on several biological activities parameters of sand lobster including growth weight and length, FCR, SR, molting and biomass, which were measured every two weeks during grow-out period. From the results of this study activity, it is found that the biological parameters of sand lobster grow-out with RAS is improving when compared to sand lobster grow-out in flow through water system (FT).