Milk Processing Industry Research Articles

Exonic mutations of POU class 1 homeobox 1 are associated with milk pH in high-producing Holstein Friesian cows

Background and Aim: Milk physicochemical properties play essential role in the milk processing industry, which are moderately to highly affected by genetic factors. This study aimed to evaluate the association between single nucleotide polymorphisms in POU class 1 homeobox 1 (POU1F1) and the physicochemical properties of milk in high-producing Holstein Friesian (HF) cows. Materials and Methods: A total of 149 high-producing dairy cows from PT Ultra Peternakan Bandung Selatan was included in this study. The physicochemical properties of milk, including density, freezing point, pH, lactose, solid non-fat, protein, and ash content, were determined. Moreover, three polymorphisms within the exon regions of POU1F1 (c.195G>A, c.300G>T, and c.828G>A) were analyzed using polymerase chain reaction-restriction fragment length polymorphism. The association between these polymorphisms and the physicochemical properties of milk was determined using a mixed-effects model analysis, in which the lactation period was used as a covariate. Results: This study found that two polymorphisms, c.195G>A and c.828G>A, significantly affected the pH of fresh milk. Cows with both the GG genotypes c.195G>A and c.828G>A had lower milk pH values than those with the other genotypes. In addition, a non-significant effect of POU1F1 was observed on the other physicochemical properties of milk. Conclusion: Two POU1F1 polymorphisms determined the pH of fresh milk in the Indonesian HF population. These are potential marker candidates for milk pH that directly affect the development of dairy products in the milk processing industry. Keywords: exonic mutation, Holstein Friesian, milk pH, physicochemical properties, POU1F1.

MENIAR EXTRACT NANO CONCENTRATE AND MILK PROCESSING TRAINING TO BOOST KELOMPOK PERAH JAYA JOMBANG'S INCOME

Segunung is one of the six Dusun in Carangwulung, Wonosalam, Jombang, East Java where Sapi Perah Jaya and Wanita Tani Perah Jaya groups manage to breed 210 dairy cows. The milk produced is deposited to KUD Anjasmoro before being transferred to the milk processing industry and some is processed by Wanita Tani Perah Jaya into pasteurized milk. The problems faced by dairy farmers, especially after the Foot and Mouth Disease (FMD) outbreak, are the decreasing milk and feed production, and livestock health. The problem faced by Wanita Tani Perah Jaya is a lack of knowledge about dairy product verification and marketing. To solve this problem the researchers administer nano meniran extract containing bioactive compounds such as flavonoids and Saponin flavonoids, as an immunomodulator, stimulate and improve the immune system and the impaired immune function, while Saponins increase the diameter of the villi and the permeability of intestinal cell walls, thereby affecting the absorption of nutrients carried by feed. If the immunity increases and the absorption of feed nutrients is good, it will increase milk production in dairy cows. Through this community service activity, there will be increased empowerment of partners of the Sapi Perah Jaya Group with training in making concentrate with meniran nano extract as well as milk processing at the Wanita Tani Perah Jaya. The solution is to diversify milk in the form of yogurt. This activity was carried out using three methods: 1) Counseling on making beef concentrate with the addition of nano meniran extract, making yogurt and marketing dairy products, 2) Training on making the concentrate and making yogurt 3) Monitoring and evaluation that was carried out every month for 3 months after the counseling and training were carried out. The results obtained from this community service are the increased empowerment of partners and the increased skills of farmers in making concentrates and dairy products in the form of yogurt and marketing them. The successful application of technology through community service can increase the income and welfare of these two groups.

EFFECT OF DAIRY AND MEAT WASTEWATER IRRIGATION ON SEEDLING GROWTH

Milk and meat processing industries release large quantities of nutrient-rich wastewater with organic compounds (proteins, fats, carbohydrates) in high concentrations. Reusing and recycling this biodegradable wastewater for crop irrigation could be a sustainable solution once the phytotoxic effects of wastewater on crops have been investigated. Therefore, the aim of this study was to evaluate the effects of milk and meat processing wastewaters on germination percentage, seed vigour indices, the seedling tolerance index and the phytotoxicity index of pea (Pisum sativum L.), sugar maize (Zea mays saccharata), purslane (Portulaca oleracea), wheat (Triticum aestivum) and red spinach (Amaranthus dubius). The two wastewater types were collected at the inlet of the city’s sewage system and analysed to determine their physicochemical and microbiological characteristics. The seeds of all five plant species were irrigated with untreated wastewater effluents. The highest - germination percentages were obtained for wheat (92%) and the lowest for red spinach (2.5%). Wheat, purslane, pea and red spinach samples irrigated with meat processing wastewater had higher germination percentages than samples irrigated with dairy wastewater. A higher phytotoxicity was observed for sugar maize, followed by red spinach irrigated with both types of wastewater. Future investigation into the effects of effluent dilution on these types of plants is recommended.

Nutrient Removal from Industrial Wastewater Systems Using Controlled Activated Sludge Treatment

Biological treatment with activated sludge as an alternative treatment was studied, and nitrogen and phosphorus were monitored. This scheme involves modifying the treatment tank by dividing it into anoxic and aerobic sections. According to this scheme, the process simulation was performed using Hydromantis' GPS-X 7.0 computer software. Wastewater discharges are usually generated by various industrial activities such as the milk (dairy) processing industry, petroleum processing refineries and slaughterhouses, which were studied in detail. The economic evaluation (cost estimation) of removing nutrients has been done using the CapdetWorks 4.0 computer simulation software. A cost sensitivity analysis has also been performed for the variable influent flows, altering the alpha factor for oxygen transfer during the aeration process and serving as a typical variable. The simulation procedure and economic evaluation have been carried out for a complete wastewater treatment plant, including both treatment lines (the water line and the sludge line simultaneously), and the derived results have been represented through illustrated graphs, tables, and meaningful diagrams.

Analisis Nilai Tambah Pengolahan Susu Sapi Dalam Upaya Meningkatkan Pendapatan Koperasi

Koperasi Peternakan Bandung Selatan (KPBS) Pangalengan has a business unit, namely PT.SKP which is a cow's milk processing industry to provide added value to milk to generate income and provide economic benefits to members. This study aims to find out: (1) how much added value of milk processing, (2) the income and cost efficiency of the cow's milk processing business, and (3) how far the added value from the processing of cow's milk in the PT. SKP business units can increase income and provide economic benefits for the members. The method is case study uses descriptive and analytic analysis, with purposive sampling. Data collected by interviews, observation and documentation. Data analysis uses added value analysis using the Hayami method and analysis of income and cost efficiency. The results are: (1). The added value of processing cow's milk into pasteurized milk was IDR 4,800 per liter or 31.37%, for yogurt it was IDR 8,500 per liter or 37.78%, while mozzarella cheese was IDR 1,200 per liter or 15%; (2) Income from processing cow's milk, in one production for pasteurized milk products is IDR 18,913,646 with an R/C ratio of 1.6, for yogurt products IDR. 9,719,346 with an R/C ratio of 1.9 while for mozzarella cheese products Rp.4,288,346 a ratio of 1.1; (3) The added value in the processing of cow's milk, the cooperative can increase its income from the provision of income from the PT.SKP business unit given to KPBS in the form of cooperation so that KPBS can provide economic benefits for members consisting of Direct Economic Benefits and Indirect Economy Benefit for cooperative members.

Financial Performance of Dairy Cooveratives in West Java-Indonesia During the Covid-19 Pandemic and Foot-and-Mouth Disease Outbreak

Dairy cooperatives play an important role to collect milk production from dairy farmers, distribution of milk to the milk processing industry, concentrate supply services, credit guarantees, artificial insemination and animal health services, savings and loan services, and various other services carried out by cooperatives. This condition causes the dependence of dairy farmers on cooperatives to be quite high. External factors can influence cooperative resilience, such as the Covid-19 pandemic and Foot-and-Mouth Disease (FMD). Therefore, the purpose of this study was to analyze the performance of cooperative milk production, and to the financial performance of cooperatives in the post-pandem Covid-19 period and during FMD. The method used in this study was a survey method to KPBS Pangalengan which represents large cooperatives, KSU Tandangsari which represents medium-sized cooperatives, and KPS Bogor which represents small cooperatives. The analysis method used standard cooperative performance methods through regulations of the Deputy for Supervision of the Ministry of Cooperatives and Small and Medium Enterprises (KUKM) of the Republic of Indonesia Number 06/Per/Dep.6/IV/2016 and key perfomance index to assess the financial performance of cooperatives. The results of the study showed that the performance of cooperative milk production decreased by 19.45% during the Covid-19 pandemic to the FMD as a result of the dairy cow mortality rate of 20.14%. The financial performance of dairy cow cooperatives was in the adequate category, both during the Covid-19 pandemic and FMD, but there was a decline in the ratio in all aspects of financial performance during the FMD. Thus, the performance of milk production and the financial performance of dairy cooperatives was better during the Covid-19 pandemic than during the FMD period. Therefore, strengthening milk production by providing new dairy cows and strengthening finances is very important

Water Footprints of Dairy Milk Processing Industry: A Case Study of Punjab (India)

A robust assessment of water used in agriculture, including livestock production systems and supply chains, is critical to inform diversification and the development of productivity and sustainable food production systems. This paper presents a detailed analysis of water used and consumed in nine dairy milk processing plants spread across Punjab, India’s leading dairy milk-producing state. Over the five years (2015–2019), the direct water use (DWU) was quantified at 3.31 L of groundwater per kg of milk processed. Only about 26% of the direct water used was consumed, including evaporative losses in various milk processing operations, while the remaining 74% was returned as effluent discharges. The average total water footprint (TWF), accounting for both direct and indirect water consumption, was quantified at 9.0 L of water per kg of milk processed. The majority share (~89%) of the total water footprint was contributed by the indirect water footprint associated with the consumption of electricity (energy) in dairy milk processing activities. The plant’s milk processing capacity and processing products mix also affected significant seasonal and annual variations in the direct and indirect water footprints of dairy milk processing. The analysis also found an inverse relationship between the average total water footprint and the average monthly amount of milk processed in the study plants. Therefore, efforts to reduce the indirect water footprint (associated with energy consumption), the treatment and recycling of effluent discharges, and the optimization of milk processing capacity, the dairy processing product mix, and the locations of dairy processing plants are expected to help reduce the water footprint of dairy processing in the state.

Development Strategy of Cow’s Milk Processing Industry Using Business Model Canvas in Gundaling Farm, Karo Regency, North Sumatera Province, Indonesia

Development Strategy of Cow’s Milk Processing Industry Using Business Model Canvas in Gundaling Farm, Karo Regency, North Sumatera Province, Indonesia

TRATAMENTO DE EFLUENTE DE LATICÍNIO POR PROCESSO OXIDATIVO AVANÇADO TIPO FENTON‑FOTOCATALISADO

TREATMENT DAIRY INDUSTRY WASTE WATER BY ADVANCED OXIDATION PROCESSES PHOTOCATALYSIS-SELF-FENTON SYSTEM. With the increase in industrial production, there is a direct increase in waste generation. Milk processing industries are one of these cases that results in a complex effluent with a high organic load. If the effluent is discarded without proper treatment, it can compromise the survival of biota in water courses. Advanced oxidation processes (AOP) are one of the main technologies used in the treatment of effluents, especially the Photocatalysis-Self-Fenton System (PF) type. The present study aimed to evaluate the efficiency of the PF process and to optimize the parameters of dairy effluent treatment. The raw effluent was characterized considering the parameters: conductivity, pH, chemical oxygen demand (COD), solids, and oils and greases. Through an experimental design, the variation of the concentrations of Fe2+, H2O2 and the reaction time were optimized, and the influence of these three variables on the removal of COD was evaluated. Statistical analysis showed that all variables were statistically significant, and the model used had a coefficient of determination of 0.97, confirming that the model was well adjusted. The ideal conditions for COD removal, reaching 79%, were obtained in 60 min, 0.625 g L-1 of Fe²+ and 0.829 mL L-1 of H2O2.

Controlling microbial population in livestock and poultry industry using electrolyzed water as an emerging technology for ensuring food safety

Poultry and livestock contribute a significant amount of energy and protein to the human diet. However, a main concern is the undesirable microbial population from the poultry and livestock system that may cause diseases in both humans and animals. Electrolyzed water has shown broad-spectrum sanitization efficiency and gained considerable popularity. This review aims to provide an overview of the use of electrolyzed water under different environment conditions for sanitization in livestock and poultry systems. Electrolyzed water serves as an excellent antimicrobial and anti-biofilm agent against various pathogenic, disease-producing, and undesirable microbes in every step of the livestock and poultry sectors from farm to fork. The synergistic effects of the oxidation reduction potential, pH, and chlorine concentration of electrolyzed water enable its potential and prompt mechanism for controlling and eliminating various microorganisms. Compared to other conventional disinfectants, electrolyzed water has been shown to be more efficient and effective. As an environmentally-friendly sanitizer, electrolyzed water has been applied in livestock and poultry production and processing sectors such as animal drinking water, feed decontamination, house sanitation, transportation system, slaughterhouse sanitation, meat-processing industry decontamination, sanitization of milk-processing industries, hatchery and eggshell decontamination. This review is aimed to discuss the microbial control in livestock and poultry industry by applying electrolyzed water as a novel sanitizer.

MODERNIZATION OF PRODUCTION PROCESSES BY MILK PROCESSING ENTERPRISES OF UKRAINE AS A FACTOR IN INCREASING THE COMPETITIVENESS OF PRODUCTS

The article examines the relevance and substantiates the need for the introduction of the latest technologies and the modernization of existing production resources by domestic milk processing enterprises. The dynamics of the active enterprises of the milk processing industry of Ukraine over the last ten years were analyzed, and their structure for 2020 was also considered. For a generalized understanding of the state of development of the milk processing industry of Ukraine, the number of operating enterprises by region was studied and ranked. It was determined that the leaders of the milk processing industry are the following regions: Kyiv, Kharkiv, Lviv, Vinnytsia and Kyiv regions. As a result of the stable growth of the number of milk processing enterprises in Ukraine, the competition in the market of dairy products is also increasing, therefore business entities need to actively look for opportunities to increase the competitiveness of their products, and this is possible by introducing the latest and resource-saving technologies into their economic activity. A technical and economic substantiation of the application of the automatic system for washing the milk line of milking units UDM-100 "Bratslavchanka" and UDE-16 "Yalynka" was carried out. It is substantiated that in order to increase the quality of milk, production efficiency and resource saving (by reducing the consumption of air, hot water, energy and operating costs) it is advisable to use the invention, which increases the efficiency of the milking system washing system by using air and hydraulic injectors with automated control of mode parameters of their action depending on indicators of contamination of the milk-conducting equipment.

Identifying biofilm forming bacteria in cow milk in Mekong Delta, Viet Nam

Bacterial biofilms are agglomeration of bacterial cells, stuck to the material surfaces of material in wet environments and formed by a self-produced matrix. The formation of bacterial biofilms is a great risk for the milk processing industry, as the survival of many bacterial species in cow milk may lead to many problems such as microbial spoilage, deterioration in quality, and consumer health risks. This study aimed to identify biofilm formation bacteria from cow milk. The experiment included isolation; biofilm forming assay in 96-well microtiter plates and the identification of microbial isolates using classical and molecular biological methods. A total of 14 bacterial isolates from 10 cow milk samples were evaluated for their biofilm formatting ability. Among them, four isolates were identified as moderate and strong biofilm producers. These four isolates belong to the genera Serratia and Aeromonas. Out of the 4 isolates, Serratia marcescens VL41 was classed as a strong biofilm producer while Aeromonas veronii ST15, Aeromonas sp. ST17, Serratia marcescens VL13 were classed as moderate biofilm producers respectively. The findings of this study suggest that it is necessary to discover the contamination causes and prevention of genera Serratia, and Aeromonas into cow milk.

Energy Costs Reduction for Dispersion Using a Jet-Slot Type Milk Homogenizer

The priority task of the milk processing industry is in reducing the specific energy consumption of milk fat dispersion while simultaneously ensuring a high dispersion of milk emulsion. One of the possible ways to solve this problem is by developing and implementing a little-studied jet milk homogenizer of the slot type. In it, homogenization occurs by implementing the method of the separate feeding of cream, which allows creating the maximum difference between the speeds of skim milk and cream, which is a necessary condition for effective dispersion. Analytical dependences have been found that relate power and specific energy consumption to the performance of a milk homogenizer with the separate cream supply, the diameter of the annular gap, the fat content of normalized milk and cream, and the cream supply speed. The rational value of the fat content of the cream used for homogenization is analytically substantiated; in order to reduce the specific energy consumption of the process, their fat content should be higher than 20%. The most significant increase in the energy costs of dispersion is observed when processing milk with a fat content of less than 3–4%, while the use of cream with a fat content of less than 20% leads to a multiple increase in the energy costs of the process. The research results indicate the hyperbolic nature of the dependence of the homogenizer power on its productivity. Supplying the cream through an annular gap of small diameter allows reducing the main component of dispersion energy costs by eight times. The obtained data indicate the existence of a deviation within 5–10% of the experimental power values from the analytical ones, which is explained by the influence of the efficiency of pumps, drives, and losses in the connecting fittings.

Synergistic effect of biochar amendment in milk processing industry sludge and cattle dung during the vermiremediation

The effective and sustainable management of fast growing and large quantities of industrial waste is a serious issue. The purpose of the present study was to assess the synergistic effect of biochar (BC) amended in milk processing industry sludge (MS) mixed with cattle dung (CD) in different ratios through vermiremediation. The MS25 and MS25BC10 (25:75 + 10 % BC) showed the least mortality and greatest earthworm growth and development. The final product from all feed mixtures recorded a decrease in pH, total organic carbon and C/N ratio. Other parameters viz., electrical conductivity, total available phosphorus, total Kjeldahl nitrogen, total sodium, total potassium and ash content was observed to be increased after vermicomposting. Significantly lower heavy metal content was found in all biochar amended feed mixtures than in mixtures without biochar. The germination index of Trigonella foenum-graecum showed a value ranging from 89.14 to 131.46 % for mixtures without BC and 115.18–153.47 % for biochar amended mixtures.

A study on the effectiveness of HRD process and climate in milk processing industries with special reference to Coimbatore district

Milk processing allows the preservation of milk for days, weeks or months and helps to reduce food-borne illness. The usable life of milk can be extended for several days through procedures like fermentation or refrigeration, which is the factor most likely to affect the quality of raw milk. The following procedures are carried out at a typical milk plant: receiving the raw milk and filtering/clarifying it. the complete or partial separation of the milk fat (for standardisation of market milk, production of cream and butter and other fat-based products, and production of milk powders). HR processes refer to the fundamental strategies necessary to support the employee lifecycle and a positive employee experience. Each HR process follows an intricate pathway that demands strategic planning according to specific parameters and objectives. While every process involves its own procedures, all processes are interdependent. HRD climate is the perception that the employees have about the policies, procedures, practices, and conditions which exist in the working environment. The study reveals the HR Process and Climate in the Milk Processing Industry, where all the segment of workers are involved in production, processing, marketing and sales.

Staff Training and Agro-processing Industry in Nigeria. A study of some selected Agro-industries in Nigeria

Training and development is a continuous exercise which aim at developing competences and enhance the individual’s capacity to contribute optimally to the development of the organisation. The aim of this study is to examine training and development as a means of driving agro-industry capacity in Nigeria. A survey research design was adopted for the study. The study was carried out in three states in southwest Nigeria. Multi stage sampling techniques was adopted to select 150 respondents in five Agro-Based industries (i.e. salt processing industry, production of flour, Maida and semolina, fruits processing industries, milk processing industries and seed processing and preservation industries). The necessary data were gathered with the aid of questionnaire distributed to 150 respondents in selected industries. The psychometric property (reliability and validity) of the instrument of data collection (questionnaire) were tested using Cronbach alpha and component factor analysis respectively. The data were analysed by means of simple linear regression with the aid of SPSS. It was revealed from the result of the analysis that there exist a positive significant relationship between Agro-processing industry and Training and Development in Nigeria. Hence, the study recommends that massive awareness should be made by Agricultural and Rural Management Training Institute in order to enhance agro industry capacity in Nigeria and the Training institute should run efficient and effective mandatory training programmes bi-annually.

Adsorption modelling and fixed-bed column study on milk processing industry wastewater treatment using chitosan zinc-oxide nano-adsorbent-coated sandfilter bed.

This study aims to develop a chitosan-zinc oxide nano-adsorbent-coated sand (CZOCS) filter bed for getting rid of milk processing industry wastewater (MPIW) in a safe way. Chitosan zinc oxide nano-adsorbent (CZnO) of 88.35 ± 2.89 d.nm size was used to coat naturally available sand through a calcination process at 200°C for a heating rate of 5°C/min. The characteristics of the diffraction peaks and functional groups are attributed to the nature of CZnO loading on the sand surface. The increase in breakthrough and exhaustion times is caused by the biological oxygen demand (BOD) and chemical oxygen demand (COD) of influent having more time to interact with the adsorbent as bed height increases, resulting in higher reduction efficiencies. Lower bed heights (10cm) which saturate faster than higher bed heights (40cm) result in a shorter mass transfer time. Adsorption capacity at the 95% column exhaustion point increased from 611.04 to 1089.63mg/g for BOD and from 4512.29 to 5600.81mg/g for COD. Different kinds of kinetic models have been used to forecast breakthrough curves employing experimental data. Statistical and error function parameters were used to choose the best-fit model. Among the modelsinvestigated, the Thomas model was shown to be the best-fit with the highest R-square values of 0.9942 and 0.9939. The CZOCS has high reusability and could be used for up to six cycles of organic pollutant adsorption. Aside from that, novel CZOCS could be used to clean real MPIW, andmaking it one of the most promising adsorbents.

PENILAIAN DAUR HIDUP PRODUK SUSU SAPI SEGAR: STUDI KASUS DI KPBS PANGALENGAN

Milk is food from livestock (animal) from dairy cows which contains protein, fat, vitamins, and minerals that can affect nutritional levels, especially in children during their growth period. The high interest in milk consumption in Indonesia affects the milk processing industry to increase every year. Starting from smallholder farms, milk can be processed into dairy products that are suitable for consumption by the community. The process of processing whole milk into dairy products that are ready to be consumed through a process that produces emissions, so that it has the potential to have an impact on the environment. The purpose of this study is to identify and quantify the materials and energy used, the amount of emissions produced from the milk production process, and estimate the magnitude of the impact on the environment and provide recommendations for alternative process improvements to minimize these impacts. The method used is a life cycle assessment (LCA) with a cradle to gate scope, starting from activities in livestock, animal feed, transportation, and process activities in cooperatives. The emission impacts studied in this study are greenhouse gases (GHG), acidification, and eutrophication. The case study was conducted at the South Bandung Dairy Cooperative (KPBS) Pangalengan. This cooperative consists of thousands of small-scale dairy farmers who contribute to the milk processing industry in Indonesia. Based on the results of the study, the impact values ​​of GHG, acidification, and eutrophication per 1 kg of milk were 10,1 kg CO2 eq, 0.03 kg SO2 eq, and 0.03 kg PO43-eq, respectively. Transportation and activities on livestock are the highest hotspots in these emissions. Efforts to reduce environmental impacts that can be done are by implementing an integrated livestock system for the utilization of nutrients from cow dung waste. Keywords: acidification, eutrophication, fresh milk, greenhouse gases, LCA

Triglyceride, fatty acid profile, antioxidant characteristics, vitamins, lipid oxidation and induction period of ice cream produced from cow and Buffalo Milk

In this study, ice creams were produced from cow and buffalo milk using 15% sugar, 13% fat, 11% milk solids not fat, and 0.5% cremodan (TS 39.5%). Triglycerides from C26 to C36 were significantly higher in buffalo milk ice cream than cow milk ice cream. Milk type and storage both affected the fatty acid composition of ice cream samples. Concentrations of unsaturated fatty acids in cow and buffalo milk ice cream samples were 24.4% and 29.9%, respectively. Total antioxidant capacity of buffalo milk ice cream was 18% higher than cow milk ice cream. Concentrations of vitamin A and E were significantly higher in buffalo milk ice cream samples. Buffalo milk ice cream had lower peroxide value and higher oxidative stability than cow milk ice cream. Induction period of cow and buffalo milk ice cream was 8.55 h and 10.79 h with no difference in sensory properties of both types of ice creams. Practical applications Buffalo milk is widely used for the production of several value-added dairy products and is the major source of milk in some Asian countries. However, due to limited research work, buffalo milk processing industry could not develop, and buffalo milk based dairy products are not available in markets of these countries. This research work can be helpful for the dairy industries to produce ice cream from buffalo milk at commercial level.

A Chitosan Zinc-Oxide Nano-adsorbent Coated with Sand Filter Bed: Characterization and Efficiency Evaluation for Treating Milk Processing Industry Wastewater

A Chitosan Zinc-Oxide Nano-adsorbent Coated with Sand Filter Bed: Characterization and Efficiency Evaluation for Treating Milk Processing Industry Wastewater