CHARACTERISTICS OF RAW WATER SOURCES AND ANALYSIS OF THE OPTIMAL MODEL OF THE MIXING PROCESS WITH PARAMETER DESIGN IN CLEAN WATER PUMP INSTALLATIONS

M a s t i a d i T a m j i d i l l a h Corresponding author Doctorate, Associate Professor* Email: mastiadit@ulm.ac.id M u h a m m a d N i z a r R a m a d h a n Master* M u h a m m a d F a r o u k S e t i a w a n Bachelor Student* J e r r y I b e r a h i m Bachelor Student* *Department of Mechanical Engineering University of Lambung Mangkurat Jl. A Yani Km 35.5, Banjarbaru, Indonesia, 70714 The quality characteristics of raw water sources in the regional integrated drinking water supply system (SPAM) of Banjarbakula were investigated and found to maintain the supply of drinking water quantity and quality in accordance with drinking water standards. The optimum model for the mixing process of raw water and poly aluminum chloride (PAC) and pump stroke for the input of water sources from rivers to obtain a composition setting that is in accordance with the raw water sources of each region in the region was selected and determined. So the optimum parameter setting model between alum water, raw water and pump stroke for each raw water source is known and is regionally integrated as a result of a comprehensive study. The integration of Taguchi parameter design and response surface can complement each other and become two methods that go hand in hand in the process of optimizing clean water products. Parameter design provides a very practical optimization step, the basis for this formation refers to the factorial fractional experimental design. However, the absence of statistical assumptions that follow the stages of analysis makes this method widely chosen by researchers and practitioners. With the experimental design of the raw water mixing process, turbidity such as 5 lt/sec, 10 lt/sec, 15 lt/sec, 20 lt/sec and 25 lt/sec and % PAC concentration 5 ppm, 10 ppm, 15 ppm, 20 ppm and 25 ppm with a pump installation stroke of 5 %, 10 %, 15 %, 20 % and 25 % were used. In the process of adding PAC, always pay attention and observe the behavior of the attractive force of the floating particles (flock). The particles were then subjected to SEM (scanning electron microscopy) to determine the dimensions of the flock grains deposited

A method has been developed for quantitative and qualitative assessment of the risk of surface water pollution by nitrogen compounds based on the use of the indicator of the total content of inorganic nitrogen forms in water (Ninorg), that is, This indicator is considered as the sensitivity coefficient kn. The choice of the indicator is dictated by the need to protect waters from pollution caused by nitrogen compounds during their flow from agricultural sources (Directive 91/676 /EU). The experience of developed countries has shown that nitrogen compounds deteriorate the quality of water and prevent the achievement of a "good ecological state" of water bodies. For territories with developed agriculture, it is important to establish environmental risks of damage depending on the degree of nitrogen pollution. Quantitative assessments of environmental risk are provided on the basis of a probabilistic approach. The risk was calculated as the product of the probability of a hazardous event occurring multiplied by the consequences of this event. The consequences of river pollution with nitrogen compounds were assessed as the ratio of the total concentration of nitrogen compounds (sensitivity index kn) to its threshold value (50 mg/dm 3 or 11.3 mgN/dm 3 ). In order to develop a scale for qualitative and quantitative risk assessment, relationships were established between the sensitivity indicators kн and the risk indicators R' for individual rivers, and for the study area as a whole, by means of spatio-temporal generalization. The probabilistic characteristics of possible environmental damage were determined on the basis of the obtained regression equations of the form R'=f(k n ) and the statistical law of distribution of the risk value R'. The developed method will make it possible to determine the rank of the risk zone and the probability of getting into it, depending on the given sensitivity indicator k n .

Svitlana Zolotarova
Kharkiv National Agrarian University named after V. V.

Yuriy Yatsenko
Poltava State Agrarian University, Poltava, Ukraine ORCID: https://orcid.org/0000-0002-3249-0150 The analysis of approaches to reduce the consumption of fodder protein and greenhouse gas emissions from organic waste in milk production is carried out, and the need to determine these indicators for various approaches to organizing the technology of their feeding is established.
An increase in the content of difficult-to-digest protein in the diets of high-yielding cows made it possible to reduce greenhouse gas emissions per head per day by 14.12 % in CO 2 equivalent when using 1.5 kg of TEP-mix in the ration of cows. When using 1.0 kg of TEP-mix, this figure was 6.44 %. In terms of 1 kg of milk with basic fat content, these indicators are 26.72 % and 12.98 %, respectively.
A multicriteria analysis of milk production with different approaches to organizing the technology of feeding dairy cows and, in particular, when using the additive TEP-mix with a protected protein showed a significant advantage of research option No. 1 (1.5 kg of TEP-mix). For it, the objective function according to the considered criteria is the smallest and amounts to 0.039 in comparison with the idealized variant. At the same time, the target function of the control variant (without TEP-mix) is 2.67 times worse, and for the experimental variant No. 2 (1.0 kg of TEP-mix) this indicator is 2.12.
The use of TEP-mix in feeding cows provided an increase in their milk productivity, milk fat and protein content and, as a result, the profitability of milk production.
The studies have found that the use of the proposed approaches to the organization of the technology of feeding cows provides an increase in their productivity, a decrease in the cost of feed protein and an improvement in environmental protection. According to the authors, this is due to an increase in the content of difficult-to-digest protein in the diets of high-yielding cows.
Keywords: tethered housing, dairy cows, milk productivity, greenhouse gases, multicriteria analysis. This paper reports a study of the air medium where welding processes take place, with special attention paid to the evolution of carbon monoxide (CO) in the working medium in the process of gas welding. Plots were constructed and polynomial dependences were obtained to show a change in the concentration of carbon monoxide in the air of the working area during gas welding.
It was confirmed experimentally that the concentration of carbon monoxide exceeds the permissible sanitary and hygienic indicators MPC (20 mg/m 3 ) during gas welding. As a result of the experiment, the effectiveness of the use of an additional device was proven, namely an umbrella gas concentrator, in order to capture welding gases that are formed during gas welding. It was established that the MPC is exceeded under certain working conditions and welding wire. The carbon monoxide formation during gas welding was analyzed; these processes were compared with electric arc welding. The mathematical dependences derived make it possible to assess the risks of the welders' work and conclude that the electric arc welding is characterized by a much higher rate of CO evolution from the beginning of the welding process (8.5 mg/s), that speed then decreases over 20 s by 2 times (to 4.5 mg/s). In 90 s, the speed becomes constant, to 2 mg/s. In comparison, gas welding has almost the same rate of CO formation, namely 0.3-0.9 mg/s. By changing the types of welding wires used in gas welding and taking into consideration the type of material that needs to be welded (including the period of its use), it is possible to influence the volume of CO emissions entering the working area and an employee's respiratory area.